Pyramid Communications SVR-200LA 29-50MHz LOW BAND TRANSCEIVER User Manual SVR 200LA Service Manual pmd

Pyramid Communications 29-50MHz LOW BAND TRANSCEIVER SVR 200LA Service Manual pmd

USERS MANUAL

LALAVHF: 29 - 50 MHz
Page 1SVR-200 Service ManualSVR-200Vehicular RepeaterThis manual is intended for use by qualified technicians and includes all necessary information pertaining to theSVR-200 operation, circuit design and maintenance. Changes that occur after date of printing will beincorporated in supplemental service publications.
Page 2SVR-200 Service ManualForewordScope of this manualThis manual contains the specifications, functional description, operating instructions, schematic, parts locatorand parts list for the SVR-200 synthesized vehicular repeater.This manual is intended for use by qualified service technicians to aid them with installation, interfacing,alignment and trouble shooting of the SVR-200 when used with other land mobile radios.Service manual revisionsComponent changes, additions and deletions may occur in the circuit design to improve operation and will bereflected in future releases of this service manual. Specifications and circuit changes are subject to change withoutprior notice or obligation by Pyramid Communications.Safety InformationThe SVR-200 is designed to operate within all applicable Federal regulations at the time of manufacture. Properoperation and service procedures will assure continued compliance with these regulations:• Do not operate the SVR-200 without an antenna or appropriate RF load connected to the antenna connector.• Do not operate the SVR-200 in the presence of unshielded electrical blasting caps or explosive environmentalconditions.• Do not operate the SVR-200 while refueling the vehicle or in the presence of explosive fumes.• Do not operate the SVR-200 with persons standing closer than 2 feet from the mobile or repeater antenna.FCC informationThe SVR-200 complies with the FCC rules parts 90 and 22 for radio frequency transmitters. The user must applyfor a license to operate the SVR-200 transmitter pursuant to parts 90.243 and 90.247. Other FCC rules may applydepending on the class of service the user qualifies for. A complete listing of FCC rules and regulations may beordered from:Superintendent of DocumentsGovernment printing officeWashington DC 20402The following information pertaining to the SVR-200 should be included in the FCC license application:Type Acceptance: LRUSVR-200LAOutput Power: 0.25-2.0WEmission designator: 20K0F3EFrequency band: 29-50 MHzNumber of Channels: 1/14
Page 3SVR-200 Service ManualSpecificationsTransmitter:VHFFrequency Range: 29-50 MHz (29-44 MHz and 36-50 MHz)Rf power out: 250mW - 2WSpurious emissions: -50dBcFreq stability -30°~+60°C: 15 PPMModulation: 20K0F3EHum and Noise: -40Audio response (300-3kHz): Flat or +6dB/octaveAudio distortion: <3% @ 60% deviationLocal mic sensitivity: 300mV-5VPPFCC Type Acceptance: LRUSVR-200LAIndustry Canada Approval: 2390 XXX XXXReceiver:Frequency Range: 29-50 MHzRF sensitivity: .35µVSquelch sensitivity: .2µV to 2µV adjustableModulation acceptance: ±7.5Selectivity: 60dBSpurious/image rejection: 60dBIMD response: 60dBFrequency stability: 1.5 PPMAudio response (300-3kHz): Flat or -6db/octaveAudio output: 0-5VPP AC coupledLocal Rx Audio: 400 mW 8 OhmsPower Requirements:DC Supply 13.6 VDCStandby 170 mAReceive 250 mATransmit 1 A @ 2WPhysical:Dimensions: 5.275"W x 6"L x 1.12"HWeight: 18 oz.Case: One piece extruded aluminium
Page 4SVR-200 Service ManualFunctional DescriptionGenerally, vehicular repeaters are used as mobile extenders in cross-band operation: the link is VHF Low Bandsimplex and the mobile is Lo-band, VHF, UHF or trunking. In-band operation is possible, but care must be takento prevent interference between the mobile's higher power transmitter and the repeater receiver. Proper frequencyselection and antenna placement are important even in cross-band operation, but especially for inband use. Theuse of low power pre-selector cavities may be placed in line with the repeater antenna cable since it is simplex andlow power.Important NoteThe SVR-200 operates on simplex frequencies; part of the multi-vehicle format dictates that all of theSVR-200s must be able to monitor all link traffic on site and be able to determine if a handheld is transmitting, orif other repeaters are transmitting. The handhelds must transmit CTCSS, but should be carrier squelch receive.The handhelds should not use CTCSS decode if the repeater is utilizing the multi-vehicle format, as this willinterfere with the priority sampling which is essential for multi-vehicle operation. Also, the handhelds would haveto have different encode and decode tones in order for the repeater to be able to tell the difference betweenhandhelds and other repeaters, so the handhelds would not be able to hear each other. The repeaters should nottransmit CTCSS unless used only in a single vehicle environment.When the user leaves the vehicle, they activate the SVR-200 via their mobile radio front panel or a separateswitch. When the mobile radio is receiving carrier and proper tone, the SVR-200 will begin transmitting on thehandheld’s receive frequency. The user is able to hear and respond to all radio traffic, including other handheldsat the site. The SVR-200 can be programmed to give the handhelds priority in a conversation by periodicallysampling for handheld activity (carrier and proper tone) during base-to-portable transmissions. During sampling,if the SVR-200 detects a handheld transmission, it will cease transmissions, key the mobile radio and repeatportable-to-base. This allows the handheld to respond during repeater hang time or during full duplex interconnectcalls. Priority sampling can be enabled/disabled through PC programming and the interval can be programmedbetween .25 seconds and 2.5 seconds in .25 second increments.The SVR-200 has a fixed 3 minute time out timer for base-to-portable transmissions. If the mobile COR isactive for more than 3 minutes (and the SVR-200 is the priority unit) it will send a double blip and cease transmissionuntil the mobile COR is inactive. The 3 minute time-out is in affect regardless of whether the SVR-200 isprogrammed for priority sampling or not.Multi-vehicle operationWhen the SVR-200 is first activated, it will transmit a short “lock tone” that alerts the user that the system isfunctioning. It will then assume the priority status and be ready to repeat any base-to-portable or portable-to-basetransmissions. If another unit arrives on scene and is activated, it too will transmit the “lock tone”; when the firstSVR-200 detects the lock tone from the second unit, it will increment a “priority counter” and will no longer repeatany transmissions. The recently arrived unit will be the priority repeater, and the first unit will be 1 count away frompriority. This process will continue for each unit that arrives at the site, creating a priority hierarchy for up to 256vehicles, each with a unique count and only one unit at priority status. The SVR-200 will not transmit it’s lock toneif the radio channel is busy when first enabled. It will wait in non-priority status until all transmissions cease, thensend its lock tone and become the priority unit.Even though the other SVR-200s are not at priority status, they will continue to monitor the channel for activity.If the priority unit were to leave the scene or become disabled, the other units will detect the condition to repeatand determine that there is no priority unit repeating the transmission. They will then begin to decrement theirpriority counters until one of them reaches the priority status and begins repeating the transmission. Since theSVR-200s are all at different counts, only one will reach priority status and begin transmitting. The other units willsense the new priority repeater and cease counting down, preserving the priority hierarchy.
Page 5SVR-200 Service ManualIf another unit were to arrive from a different scene and it is still the active priority, there will be two activerepeaters on the air when a condition to repeat exists. When one of the SVR-200s unkeys to check for handheldactivity, it will detect the presence of the other active SVR-200 and increment it’s priority counter and ceasetransmission. This is the self clearing mode to prevent radio collisions.If the handheld operator is out of the vehicle and their partner still in the vehicle were to key the mobile radiousing the local mic, the SVR-200 will detect the local PTT and repeat the transmission to the other handhelds sothat both sides of the conversation will be heard by everyone on the link. The local mic repeat function can beenabled/disabled via the PC software.The SVR-200 also has a local receive audio speaker jack that enables the person in the vehicle to monitorportable-to-base transmissions that are being repeated through the mobile.If the users wish to communicate portable-to-portable without accessing the mobile repeater, they may transmiton the same frequency without CTCSS (or a different CTCSS); the SVR-200 only responds to carrier and propertone from the handhelds.Trunking operationWhen the SVR-200 is connected to a trunking mobile and the handheld operator wishes to access the system,they key their handheld briefly then release. The SVR-200 will attempt to acquire a voice channel on the trunkingsystem by keying the mobile for 200mS and monitoring the on-air detect line from the mobile. If it does not seethe radio transmit at all (system is busy), it will send a low tone to the hand held operator to alert them that the systemis busy. The SVR-200 will automatically retry every 5 seconds and send busy tone to the handheld with eachunsuccessful attempt to indicate progress of the call attempt. If unsuccessful after 30 seconds, the SVR-200 willtransmit intercept tone to alert the handheld operator that the call attempt failed.When the SVR-200 detects that the mobile is transmitting, it will continue to monitor the on-air line until thetransmitter remains keyed for at least 250mS to ensure that the radio is merely handshaking or retrying. Aftersuccessful acquisition of a voice channel, it will continue to hold the mobile PTT active for 2 seconds and transmita go-ahead blip to the handheld operator. The user then keys their handheld to speak on the voice channel. If theuser does not key up within the 2 second period, the SVR-200 will unkey the mobile and send intercept tone asbefore.If the user keys their handheld only once, or they key the first time for more than 1 second, the SVR-200 willcancel the call attempt and send intercept tone to the handheld operator. All of the queuing and error tones will onlybe sent if the handheld is not transmitting to ensure that the user hears the proper tones.LEDsCPU: Flashes at a 1 Hz rate to indicate proper operation of the microprocessor.PRI: When on, indicates that the unit is at priority count zero and will repeat all transmissions.RCOR: Repeater Carrier detect.RTONE: Repeater sub-audible decode; when on, indicates a condition to repeat portable-to-base.RTX: Repeater transmit indicator.MCOR: Mobile unmute detector indicating a condition to repeat base-to-portable.MTX: Mobile transmit indicator.OPT: Should be on steady during programming operations only. If OPT LED flashes at 10Hz rate, it is anindication that the PLL did not lock within the allotted 50mS and the unit should be serviced.
Page 6SVR-200 Service ManualInstallationBefore installing the SVR-200, ensure that the RF and repeater sections are properly aligned per the tuninginstructions on pages 8-14 of this manual. Additionally, ensure that the SVR-200 jumpers are properly configuredfor use with the particular mobile radio that it will be connected to:J1 Controls the maximum drive level of the transmit audio output to the mobile radio. If J1 is installed, output ampU1B will have an adjustment range of 0-100 mVPP. If J1 is removed, U1B can be adjusted between 0-5VPP.J2 Controls the output impedance of the transmit audio line to the mobile radio. If connected to a low impedancepoint in the mobile, installing JP2 sets the output impedance to 600 ohms. If JP2 is open, the output impedanceis 2.2Kohms. Install the jumper for radios that require a lot of modulation drive or that have low impedancemicrophone circuits. Remove the jumper if the SVR-200 installation decreases local microphone audio at themobile.J3 Used for testing the SVR-200 receiver and setting the lock tone deviation transmit level. If JP3 is shorted atpower up, the SVR-200 receiver will be active all of the time and receiver audio will be heard at the speakerregardless of the repeater squelch setting or CTCSS tone decoded. Remove the jumper and turn the SVR-200off to return to normal operation. If JP3 is shorted while power is applied, the SVR-200 will go into transmitmode and send lock tone for as long as the jumper is shorted. Remove the jumper to return to normal operation.J4 Used to internally tie the local mic input of the SVR-200 to the transmit audio output line which is usuallyconnected to the mic hi line in the mobile.J5 Used to internally tie the on-air detect input of the SVR-200 to the PTT output. Do so only on conventionalradios; trunking radios must have the on-air detect line connected to a line indicating that the radio istransmitting.J6 Changes the maximum gain of the local mic input amp from unity (Out) to 10x (In).J7 Changes the maximum gain of the receive audio line input from unity (Out) to 7x (In).J8 Adds a pull up (+ position) or pull down (- position) resistor to the remote enable line (blue).J9 Adds a pull up resistor (10K to 5VDC) to mobile COR line (violet)Make the connections between the mobile radio and the SVR-200 cable as follows:Pin 1: Ground. Connect to the radio's chassis or ground plane.Pin 2: Mobile transmit audio. Connect to the mobile transmit audio path or tone input. If connected beforepre-emphasis, ensure that the SVR-200 is programmed for de-emphasis (common data). If connectedafter pre-emphasis, ensure that the SVR-200 transmit audio path is programmed as flat. Pin 2 is ACcoupled and has an output impedance of 600 or 2.2Kohms (determined by J2). RV3 sets the transmitaudio output level and J1 sets the adjustment range between 0-5VPP (J1 open) or 0-100mVPP (J1shorted).Black/ShieldWhite
Page 7SVR-200 Service ManualPin 3: Remote enable/disable. Connect to the radio's auxiliary output or a separate switch to remotely enableor disable the repeater. If this line goes high to activate the repeater, ensure that JP1 is set to the “+”position. If this line goes to ground, set JP1 to the “-” position. J8 has two positions to add a pull up(+) or pull down (-) resistor to this line if used with an open collector or dry contact output.Pin 4: Mobile PTT output. Connect to mic PTT on the mobile radio, or a line that goes active low to transmit.Pin 4 is an open collector output rated at 100mA at 50VDC.Pin 5: 12 VDC input. Connect to the radios 12V switched supply or a point capable of supplying at least 1.5Aof current.Pin 6: Mobile receive audio. Connect this line to the mobile receive audio path before the volume control.If pin 6 is connected before de-emphasis, ensure that the SVR-200 receive path is programmed as flat(common data). If connected after de-emphasis, program the receive path for pre-emphasis. Pin 6is AC coupled and high impedance (>15K ohm). RV5 sets the receive audio level sensitivity; this inputshould be between 30mVPP and 5VPP. J7 sets the gain of the receive input amp. If open, the inputhas a maximum gain of one; if installed, the input has a maximum gain of 7.Pin 7: Mobile COR detect. This line is used to indicate when the SVR-200 should repeat the transmissionto the handheld. Connect to a logic point in the radio that indicates proper tone and carrier have beendetected or the audio unmute line. If this line goes more positive during an unmute condition, programthe mobile COR line as active high (common data). If the line goes more negative during an unmutecondition, program the mobile COR line as active low. The input from pin 7 is high impedance and doesnot have to go rail to rail. The SVR-200 uses a voltage comparator as a COR threshold detector. RV1sets the mobile COR threshold level and should be set for half way between the mute and unmute levelsat pin 7. Example: If Pin 7 is connected to a point that goes from 0VDC (mute) to 5VDC (unmute),set RV1 for 2.5VDC and program the mobile COR line as active high. If Pin 7 goes between 7.2VDC(mute) and 5.8VDC (unmute), set RV1 for 6.5VDC and program the mobile COR line as active low.Pin 8: Local mic audio. If programmed for local mic repeat, the SVR-200 will go into transmit mode andrepeat the audio from this line whenever the mobile radio is keyed by the local mic. Connect this lineto the mobile transmitter audio path before limiting or filtering. This input is AC coupled and highimpedance (>5.6Kohms). The input level at this pin should be 300mV to 5VPP. RV2 sets the localmic sensitivity. If the mic high line has sufficient drive for this input, install J4 and leave pin 8unconnected. J6 sets the gain of the local mic input amp. If open, the maximum gain is one; if installed,the maximum gain is 10.Pin 9: On-Air detect.Trunking: Connect to a point in the radio that indicates the mobile transmitter is actually on the air.This is not the same as mic PTT. If pin 9 goes positive during transmit, program the on-air detect linefor active high (common data). If pin 9 goes to ground during transmit, program the on air detect linefor active low.Conventional: Used for local mic repeat indication from the mobile. Connect pin 9 to pin 4 of theSVR-200 and program the on-air detect line for active low. Solder jumper J5 will connect pin 9 to pin4 (PTT output) and can be used on conventional systems only. Do not install J5 for trunkingoperation.Install the SVR-200 in the vehicle using the supplied mounting bracket and hardware. Install the unit whereit will be easily visible by the driver and will not interfere with the drivers vision or constitute a hazard during a vehiclecollision. The SVR-200 mounts in the bracket using the four 8-32 x ¼" machine screws. Do not use longer screwsto mount the SVR-200 to the bracket or circuit damage may result.BlueGreenRedYellowVioletBrownGray
Page 8SVR-200 Service ManualAlignmentBefore aligning the SVR-200, ensure that the mobile radio is aligned per the manufacturer’s service procedure;Ensure that the SVR-200 is properly programmed and the jumpers are set per the previous section.In order to properly align the SVR-200, you will need two service monitors and the mobile radio that the repeaterwill be installed with. Refer to figure 1 for alignment points.Dis-assemble the repeater by removing the two cap screws on the rear panel and the phillips screw on thebottom. Slide the main circuit board out of the housing with the rear panel attached. Connect one service monitorto the SVR-200 TNC jack and the other to the mobile antenna jack. Connect the cable from the mobile radio tothe SVR-200 (See figure 4 on page 14). Turn on the mobile and activate the SVR-200.Adjust the repeater squelch control (RV9) so that the repeater COR led is off. Adjust the mobile so that the audiois squelched.SVR-200 Transmitter1. Transmitter Output: Short J3 and adjust RV10 for maximum. Confirm the SVR-200 RF Power out is at least2W. Adjust RV10 for 250 mW. The SVR-200 case is integral to the voltage regulator heat sink and the unitshould not transmit at full power when removed from the case for extended periods.2. Transmitter frequency: Adjust the TCXO on the RF board for the transmit frequency.3. Maximum deviation/lock tone deviation: Adjust RV7 (lock tone deviation) for maximum. If the SVR-200is programmed for sub-audible encode, adjust RV6 (CTCSS) for minimum. Adjust RV8 (repeater deviation)for 95% deviation. Adjust RV7 for 60% deviation. Remove J3.4. Mobile COR: Measure the voltage at TP2 on the SVR-200 main PCB and record. Set the mobile servicemonitor for the mobile receive frequency, 1mV RF output and CTCSS modulation of 15% deviation. Measurethe voltage again at TP2 and record. Turn the mobile service monitor off and adjust RV1 on the SVR-200 mainboard for the halfway point between the two voltage readings as read at pin 3 of U1.5. RX audio sensitivity/CTCSS deviation: Set the service monitor connected to the mobile for the mobile receivefrequency and 1mV RF output. Modulate the signal generator with a 1kHz tone at 60% deviation and CTCSStone at 15% deviation. Ensure that the SVR-200 mobile COR and repeater PTT LED’s are on. Adjust RV5on the SVR-200 main board for 60% deviation as read on the service monitor connected to the SVR-200. Ifprogrammed for sub-audible encode, remove the 1kHz tone deviation from the mobile service monitor andadjust RV6 on the SVR-200 main board for 15% deviation. Turn the RF output from the mobile service monitoroff and ensure that the SVR-200 mobile COR and repeater PTT LEDs are off.6. Local mic repeat: If the SVR-200 is programmed for local mic repeat, key the mobile local mic and inject anaudio signal into the local mic to produce 60% deviation on the service monitor connected to the mobile.Confirm that the SVR-200 repeater PTT LED is on; adjust RV2 for 60% deviation as read on the servicemonitor connected to the SVR-200. Unkey the mobile radio.7. RF power out: Short J3 and adjust RV10 for the operating power output. Open J3.
Page 9SVR-200 Service ManualFigure 1Receiver1. Receiver IF: Connect a DC voltmeter to TP1 on the SVR-200 main board. Set the service monitor connectedto the SVR-200 to the generate mode, receive frequency with a 1kHz tone and 60% deviation. Adjust the RFoutput of the monitor for a 1VDC reading at TP1. Adjust T1 and T2 on the RF board for a maximum readingat TP1.2. Repeater squelch: Adjust the service monitor RF output for .5µV. Adjust RV9 on the SVR-200 main boardso the repeater COR LED is just on. Decrease the service monitor RF output to .3µV and ensure that therepeater COR LED is off.3. Transmit audio output: Adjust the service monitor RF output for 1mV. Turn the CTCSS modulation on andset for 15% deviation. Confirm that the repeater COR, CTCSS and mobile PTT LED’s are on. Adjust RV3on the SVR-200 main board for 60% deviation as read on the service monitor connected to the mobile radio.4. Local Rx audio: Connect an 8 ohm speaker to P4 and set RV4 for the desired listening level. Turn off theCTCSS modulation of the service monitor connected to the SVR-200. Confirm that the repeater CTCSS andmobile PTT LED’s are off.5. Lock Tone Decode: Change the 1kHz tone modulation to the lock tone frequency. Confirm that the PRI LEDgoes off after approximately .5 seconds.TP2
Page 10SVR-200 Service ManualMobile RadioCommunicationsMonitor ACommunicationsMonitor BSVR-200InterfaceCableFigure 4
Page 11SVR-200 Service ManualMenu selectionsFileOpen: Allows you to load a previously saved file from disk. Enter the file name or select from the Windows Dialogbox. Only files with the .VR2 extension can be loaded.Save: Allows you to save the current configuration to disk. Enter the file name to save as or select a previous filefrom the Windows Dialog box to overwrite. The .VR2 extension is automatically added to the file name. Theprogram will prompt you before overwriting an existing file.Print: Sends the current configuration to the selected printer. Make sure the printer is on line and paper is loadedbefore executing this command.Exit: You will be asked to confirm before exiting the program. The software will also prompt you if theconfiguration has changed since program start up and data has not been saved to disk.DataFrequencies: Enter the transmit and receive frequencies and select the encode and decode sub-audio data. Theprogram will automatically round off the frequencies to the nearest channel step if incorrect data is entered. Toenter VHF offset frequencies (6.25kHz channel steps), go to common data and select the "VHF Offset" band.To disable sub-audio encode operation, select "------"; sub-audio decode cannot be disabled.Common data: Controls all of the options and input polarities of the SVR-200. Make sure all of the settings arecorrect for the type of mobile radio the repeater is connected to or improper operation may result.File name: This data is stored in the E²PROM of the SVR-200 during downloads.Model: Select either SVR-200 (single frequency) or SVR-214 (14 channel).Band: Select the proper frequency band to correspond with the model SVR-200 you are programming. Thisselection is automatically set by reading the SVR-200. The IF frequency, injection side and channel step aredisplayed next to the band selection. Select VHF Offset band for 6.25kHz channel steps.ProgrammingUsing the SoftwareThe SVRCPS personalization software is used to program the SVR-200 for all of the operating parametersand options. The software is compatible with Windows 2000 and later operating systems The software is menudriven and on-line help is available at any time by clicking the left mouse button on the HELP icon on the right sideof the tool bar.Important Note:Before attempting to program the SVR-200 start the software and ensure the FY-1 programming cable isplugged into the correct serial port. The com port may be selected under the “Transfer” menu. Plug the FY-1programming cable into P3 on the front of the SVR-200; the OPT LED on the SVR-200 front panel should be oncontinuously:
Page 12SVR-200 Service ManualMobile COR polarity: Determines if the COR signal from the mobile is active high or active low.Radio Type: Select either conventional or trunking. If a trunking mobile is selected, the SVR-200 will go throughthe voice channel acquisition procedure during portable-to-base repeat mode.On-air polarity: Select either active high or active low. This line is used to monitor the local mobile PTT for localmic repeat on conventional radios. On trunking radios, it is also used to determine if the mobile is actuallytransmitting.TX Audio: If the mobile transmit audio output from the SVR-200 is connected after pre-emphasis in the mobile,select Flat response. If connected before pre-emphasis or to the mic input, select De-Emp.RX Audio: If the receive audio coming from the mobile is connected to the discriminator or before de-emphasis,select Flat response. If connected after de-emphasis, select Pre-Emp.Lock Tone: Select either 682.5, 832.5 or 847.5 Hz. All units in the system must have the same lock tone frequency.Local mic repeat: Enables or disables the local mic repeat function; if enabled, ensure that the on-air polarity inputis correctly configured.Courtesy Blip:(Firmware version 3.02 & above) Enables or disables the courtesy tone at the end of eachportable-to-base transmission. The tone verifies the handheld is within range of the repeater and transmission wassuccessful. It also serves to notify other handheld users that the channel is clear for use.Pri-sampling: Enables or disables the pri-sampling feature of the SVR-200. If used in multi-vehicleapplications, this must be enabled for proper operation. During base-to-portable repeat mode, the SVR-200transmitter will switch to receive mode to check for other repeaters or handheld activity. If another repeater isdetected (carrier without/wrong tone) the repeater will cease activity to prevent radio “collisions”. If handheldactivity is detected (carrier & correct tone) the SVR-200 will switch to portable-to-base repeat mode.Sampling rate: If pri-sampling is enabled, this selects the sampling interval. The range is 0.25 seconds to 2.5seconds in .25 second increments. The higher this setting, the longer the handheld operator must wait beforespeaking after pressing PTT during base-to-portable repeat mode, since the repeater may still be in transmit mode(there is no delay if the repeater is idle). If the interval is too short, some users may complain about the “chop”that is heard in the handhelds.TransferSend: Downloads the current configuration to the repeater. The program will prompt you to make the FY-1connection before downloading. Download takes approximately 5 seconds.Receive: Uploads the current data from the repeater. The program will prompt you to make the FY-1 connectionbefore uploading. Upload takes approximately 4 seconds.Comm Port: Selects the serial port to use for uploading and downloading between the PC and the SVR-200. Commports 1-4 are supported.HelpHelp is available at any time by clicking the left mouse button on the HELP icon on the right side of the toolbar. The help is context sensitive and will depend upon where the cursor is located on particular menu displayed.
Page 13SVR-200 Service ManualTheory of OperationReceiver:The receiver is a double-conversion superheterodyne type, designed for narrow band FM reception. The firstlocal oscillator is derived from the frequency synthesizer. The second LO is crystal controlled.RF Stage: The incoming RF signal from the antenna jack is directed to the first RF bandpass filter to improveselectivity and then to the input of the RF amplifier. The output of the RF amplifier is then presented to a secondbandpass filter.First LO/Mixer: The first LO signal is developed by the synthesizer and is mixed with the incoming signal toproduce the first IF frequency (70 MHz high side injection). The IF frequency is filtered by FL1A and FL1B andamplified by the IF amplifier before being presented to the second LO/Mixer IC.Second LO/Mixer: The first I.F. signal is presented to the second IF IC (MC3371) which performs the functionsof second LO, second I.F. amp and mixer, FM discriminator and squelch. The second LO crystal (69.545 MHz)is mixed with the 70 MHz first I.F. signal to produce the second I.F. frequency of 455 kHz. A 6 pole ceramic filterprovides selectivity for the 455 kHz signal.Detector/Squelch: The MC3371 demodulates the 455 kHz signal via quadrature coil to produce the audio and noisecomponents. The output of the MC3371 is the recovered audio and the RSSI voltage (receiver signal strengthindicator) which is compared by the controller board with a threshold voltage level for squelch setting.TransmitterThe output of the VCO is buffered by U5 and amplified by U6. The output of U6 drives the RF driver Q6.The collector of Q6 is fed by the transmit 9V line from Q5. The final amp Q7 is a class C power amplifier anddrives the output lowpass and harmonic filte. U8 is the antenna switch. RF output power is controlled by changingthe bias on the gate of Q7 via the TX 9V line (pin 3) from the controller PCB.Control BoardPower Supply: DC power comes from the mobile radio via P1 pins 1 and 5. Fuse F1 and MOV VAR1 provideover current and voltage spike protection. Q3 is the remote enable/disable pass switch, controlled by Q1 and Q2via P1 pin 3. Q3 output is switched 12VDC and is presented to audio amp U6, and voltage regulators U7 and U8.Bias voltage for the op-amp circuits is provided by voltage divider R68, R69 and buffer amp U2A.Transmit audio path: Receiver audio from the mobile is input to the mic amp portion of U4; PC programming ofthe SVR-200 provides flat response or +6db/octave pre-emphasis. The output of the mic amp is internally connectedto the limiter and lowpass filter. When a condition to repeat exists (base-to-portable) U4 audio is switched on andaudio is presented to amplifier/limiter and lowpass filter to remove audio components above 3kHz. U4 provides-48db/octave of attenuation to out of band signals. Transmit audio is output on pin 22 of U4 and passes throughthe final lowpass filter U2C to remove any clock noise generated by U4’s switched capacitive filters before beingpresented to the RF module on P2 pin 6.
Page 14SVR-200 Service ManualReceive audio path: Receiver audio from the transceiver module is input on P2 pin 13 and presented to U5 pin10 and pin 16. Pin 10 is the input of the receiver highpass filter to remove any sub-audible signals before being outputon pin 11 and sent to U4 for receiver audio processing. Pin 16 is the input to the sub-audible tone decoder sectionof U5. Receive audio entering pin 7 of U4 is processed as flat, or -6db/octave depending upon PC programming.The receive audio then passes through the internal lowpass filters to remove unwanted noise and output on pin 21,where it is sent to the local receiver audio amp and mobile transmit audio output amp U1B. J1 selects either highsensitivity (open) or low sensitivity (shorted) and J2 selects the output impedance (600/2.2K Ohms).Sub-Audible tone signalling: U5 processes the sub-audible signal from the receiver by comparing the incomingsignal to previous samples in a noise correlator. If the signal is sufficiently coherent, the output of the comparatoris counted by the internal circuitry and an interrupt is generated to the main microprocessor. U12 reads the datafrom U5 in 2 bytes: byte one contains the number of complete cycles detected within 122mS, and byte 2 containsthe number of internal clock cycles elapsed for the remainder. U12 performs a comparison of minimum andmaximum values allowed in a look up table and determines if the data is within the decode bandwidth for theprogrammed tone.In band tone signalling: Audio from the transceiver is also fed to U3B where it is amplified and limited for inputto the commutating switched capacitive filter made up by C23-C26 and P0.4-P0.7 of the microprocessor. Themicroprocessor outputs four identical signals with 90° phase difference on the respective port pins. The resultantwave form will be a function of the difference between the incoming signal frequency and the decode frequencyoutput by the microprocessor. The signal is buffered by U3C and amplified by U3A before being rectified andfiltered by D1 and C2. The resulting DC voltage is compared to the reference voltage by U3D. If the incomingsignal is within the decode bandwidth, the output of U3D will be a logic 1 and read by the microprocessor.Logic and control: U12 is an Atmel 89C52 microprocessor with flash E²PROM memory. The microprocessorprovides all of the logic and control functions for the repeater including mobile/repeater PTT output, local mobilePTT sense, mobile transmitter activity sense, audio switching, in-band & CTCSS detect, and repeater statusindications via DS4 and DS5 led arrays.The 89C52 has four 8 bit ports that interface with the rest of the hardware on the controller board; a briefdescription of each port follows:P0.0-0.3 Channel Selector input; used only on SVR-214 version.P0.4-0.7 These four lines make up the input to the switched capacitive filter network of C23-C26. Duringreceive mode, the lock tone frequency will be output on each of these lines with a 90° phase differencebetween them at any given time. During transmit mode, these lines are in active and open collector.P1.0-P1.2 LED data is output on P1.0 line every 10mSec. Data is loaded into shift register U9 8 bits at a timeand is clocked by P1.1. P1.2 latches the data into U9 for display.P1.3 PLL latch enable output to the RF module. During transmit to receive and receive to transmittransitions, this line is used to latch the serial data into the PLL shift registers. The serial data and clocklines are shared with U10 (E²PROM) U4 (audio processor) and U5 (sub-audio processor).P1.4 E²PROM chip enable, active high. Data is output to the E²PROM on P1.6 and clocked by P1.5. Datais input from the E²PROM on P1.7. P1.4 will go active during read and write operations with U10.U10 is written to every time the unit is programmed. U10 is read only at power up.
Page 15SVR-200 Service ManualP1.5 Serial clock line output. Serial data that is sent to the PLL, the E²PROM and the audio processor chipsare clocked by each low-high-low transition on this line.P1.6 Serial data output. Data sent to U10, U4 and U5 are output on this line and clocked by P1.5.P1.7 Data input to the microprocessor. Serial data is read from U10 (E²PROM) and U5 (sub-audioprocessor) on this line.P2.0 Lock tone output. Lock tone encode is generated by this pin at power up and during lock tone test mode.All of the queuing tones are also generated by this pin for trunking operation.P2.1 Lock tone decode input, active high. The output of lock tone decoder U3D is input on this line andchecked during receiver activity. If lock tone is detected, the microprocessor increments its prioritycounter and ceases activity as priority unit.P2.2 Repeater Tx enable. This line is used to turn on the TX 9V signal to the RF PCB. The output drivesbuffers Q7 and Q6. The output of Q6 switches Q4 on during transmit for TX 9V. RV10 and APCcircuit U13 are used to set the TX 9V level for RF power control.P2.3 Mobile PTT output, active low. This line is brought low to key the mobile radio during portable-to-baserepeat operations.P2.4 Mobile COR input. U1A is a threshold detector for the mobile COR input on pin 7 of P1. The outputof U1A is read by the microprocessor on this port to determine if the SVR-200 should repeat base toportable. Polarity of this input is determined by PC programming.P2.5 Repeater COR input, active low. RSSI output from the RF module is sent to threshold detector U2Dfor comparison with the squelch setting at RV9. R47 and R70 provide hysteresis to prevent chatter.Repeater COR is used to enable the CTCSS decoder circuitry; the microprocessor will not decodethe signal from U5 unless repeater COR is also active.P2.6 Chip select output for U4 (audio processor), active low. Serial data is sent to U4 on P1.6 and clockedby P1.5. These lines are shared by U5, U10 and the PLL; data is ignored by U4 unless the chip selectline is asserted during data write operations.P2.7 Chip select output for U5 (sub-audio processor), active low. Serial data is sent to U5 on P1.6 andclocked by P1.5. These lines are shared by U4, U10 and the PLL; data is ignored by U5 unless thechip select line is asserted during data read and write operations.INT0 External interrupt #0. This line monitors the PLL lock detector output. The line is active high to indicatethe PLL is functioning on frequency during transmit-receive and receive to transmit changes. Theoutput will go briefly unlocked, then revert back to a locked condition. If the PLL does not achievelock within 50mS, the transmitter will be disabled and the OPT LED will flash rapidly to alert the userthat the unit should be brought in for service.INT1 External interrupt #1 active low. This line is used by U5 to signal the microprocessor that it hascompleted a decode cycle and data can be read. During receiver activity, this line will go activeapproximately every 122 mS in the presence of sub-audio signalling. During transmit mode andreceiver activity without sub-audio signalling, this line will be inactive.
Page 16SVR-200 Service ManualT0 Test input, active low. Shorting J3 puts the microprocessor into test mode for alignment purposes. Ifshorted at power up, the receiver will operate open squelch mode and audio will be heard at the localspeaker port regardless of carrier or tone input to the receiver. Although alignment is normally donewith the RSSI output at TP1, a Sinad reading can be obtained using this mode of the test input. Allother functions of the SVR-200 are disabled in this mode and power will have to be turned off thenon to reset the unit.If J3 is shorted after power has been applied, the microprocessor will enter the lock tone test mode,key the repeater and send the programmed lock tone for as long as J3 is shorted. Remove the shortfrom J3 to return to normal operation.T1 On-air detect input. The on-air detect line (P1 pin 9) is used to detect local mic PTT from the mobile,and in trunking mode, this line is used to detect that the mobile transmitter is actually on the air. Theinput is buffered by Q10 and the polarity of the signal is determined by PC programming.WR Turns the Rx 5V line on or off to the RF PCB.RD Detects the version of RF PCB installed (UHF only).TXD Transmit data output for programming. Data is sent to the PC on this line at 300 baud, 8 data bits, 1stop bit and no parity. This line is active only during programming mode.RXD Receive data input for programming. Data is received from the PC on this line at 300 baud, 8 databits, 1 stop bit and no parity. This line is also used to sense when the programming cable is inserted.If RXD is grounded, the SVR-200 operates in the normal mode. If this line is high, programming modeis entered and the OPT LED is on continuously.Reset Active high input to reset the microprocessor. U11 provides a 350mSec delayed high signal to this pinduring power up or if the 5V line falls below 4.5VDC.Xtal The microprocessor uses a 4.032MHz xtal for all of the timing and program execution clock cycles.The output of the on board oscillator also drives the xtal input to U5. The output of U5 xtal oscillatordrives the input of U4.
Page 17SVR-200 Service ManualNotesThis Page Intentionally left blank
Page 18SVR-200 Service ManualParts ListReference Description Part #C1,C5,C6,C9,C10,C12,C15,C18,C35,C37 ......................... .1µFd chip capacitor ............................ 1010-03-5104C2 ..................................................................................... 22µFd 16V tantalum chip capacitor ..... 1610-25-6226C3,C27 .............................................................................. .047µFd chip capacitor ........................ 1010-03-5473C7,C8,C13,C41 ................................................................. 220pFd chip capacitor ......................... 1010-03-5221C11 .................................................................................... .0033µFd chip capacitor ...................... 1010-03-5332C16 .................................................................................... 1000pFd chip capacitor ....................... 1010-03-5102C17 .................................................................................... .0022µFd chip capacitor ...................... 1010-03-5222C19,C20 ............................................................................ 22pFd chip capacitor ........................... 1010-03-5220C40 .................................................................................... 0.5pFd chip capacitor .......................... 1010-03-5050C21A,C21B ...................................................................... 6.8µFd tantalum chip capacitor ........... 1610-05-6685C22,C32,C33,C34 ............................................................. 100µFd elctrolytic cap ......................... 1400-08-7107C21,C23,C24,C25,C26 ...................................................... 0.47µFd tantalum chip capacitor ......... 1610-04-6474C28,C29,C36 ..................................................................... 1.0µFd tantalum chip capacitor ........... 1610-04-6105C14,C30,C38 ..................................................................... 2.2µFd tantalum chip capacitor ........... 1610-04-6225D1,D2,D3,D6 .................................................................... BAV99 dual diode SOT23 .................. 3110-01-0099D4,D5 ............................................................................... Schotkey diode SOT23 ........................ 3110-01-0301DS4/DS5 ........................................................................... 8 position multi-color LED .................. 4003-08-0200F1 ...................................................................................... 2A SMT Pica fuse .............................. 2610-04-0020JP1 .................................................................................... 0.1" 3 position vertical header ............. 7300-53-0103P1 ...................................................................................... DB-9 M right angle PCB .................... 7400-00-0011P2 ...................................................................................... 0.1" 14 position vertical header ........... 7300-83-0114P3 ...................................................................................... 2.5mm RA programming jack ............. 7401-02-0250P4 ...................................................................................... 3.5mm RA speaker jack ..................... 7401-02-0051Q1,Q2,Q6,Q7,Q9,Q10 ....................................................... 2N4401 NPN transistor SOT23 .......... 3010-01-4401Q3 ..................................................................................... IRF-9540 P Ch MOSFET TO220 ....... 3300-08-9540Q4 ..................................................................................... TIP 32 PNP transistor TO220 ............ 3000-08-0032Q5 ..................................................................................... 2N4403 PNP transistor SOT23 ........... 3010-01-4403Q8 ..................................................................................... NPN Darlington SOT23 ...................... 3010-01-0038RV1,RV8,RV9,RV10 ....................................................... 10K 3mm SMT pot ............................. 2030-08-8103RV2,RV3,RV5,RV7 ......................................................... 100K 3mm SMT pot ........................... 2030-08-8104RV4 .................................................................................. 20K 3mm SMT pot ............................. 2030-08-8203RV6 .................................................................................. 200K 3mm SMT pot ........................... 2030-08-8204R82 .................................................................................... 10 Ohm chip resistor ........................... 2010-03-5100R10,R23,R41,R52,R76 ...................................................... 10K chip resistor ................................. 2010-03-5103R8,R11,R16,R21,R22,R24,R26,R30,R35,R44,R47,R53,R66,R73 ............................................................. 100K chip resistor ............................... 2010-03-5104R1,R2,R4,R6,R15,R17,R18,R31,R36,R74,R83 .................. 22K chip resistor ................................. 2010-03-5223R3,R12,R13,R65,R72,R87 ................................................. 2.2K chip resistor ................................ 2010-03-5222R5,R14,R86 ....................................................................... 820 Ohm chip resistor ......................... 2010-03-5821R7,R48,R49,R63,R71 ........................................................ 5.6K chip resistor ................................ 2010-03-5562R9,R81 .............................................................................. 56K chip resistor ................................. 2010-03-5563R19,R20 ............................................................................ 470K chip resistor ............................... 2010-03-5474R25,R29,R34,R51 ............................................................. 1.0M chip resistor ................................ 2010-03-5105R27,R33,R37,R38,R45,R46,R85 ....................................... 33K chip resistor ................................. 2010-03-5333R32,R70 ............................................................................ 27K chip resistor ................................. 2010-03-5273R39,R40 ............................................................................ 150K chip resistor ............................... 2010-03-5154R42 .................................................................................... 330K chip resistor ............................... 2010-03-5334
Page 19SVR-200 Service ManualR50,R77-R80 .................................................................... 15K chip resistor ................................. 2010-03-5153R54-R62,R64 .................................................................... 330 Ohm chip resistor ......................... 2010-03-5331R68,R69 ............................................................................ 4.7K chip resistor ................................ 2010-03-5472R43.................................................................................... 68K chip resistor ................................. 2010-03-5683R67.................................................................................... 8.2 Ohm 1W resistor ........................... 2000-10-5829U1 ..................................................................................... TS922 dual op-amp ............................. 3410-01-0922U2,U3 ............................................................................... MC3403 quad op-amp ......................... 3410-01-3403U4 ..................................................................................... MX-806ALH audio processor ............ 3710-02-0806U5 ..................................................................................... MX-805ALH sub-audio processor ...... 3710-02-0805U6 ..................................................................................... LM386 audio amp ............................... 3410-01-0386U7 ..................................................................................... LM7805 1A regulator ........................ 3400-08-7805U8 ..................................................................................... LM7809CV 1.5A regulator ................. 3400-08-7809U9 ..................................................................................... CD4094 shift register .......................... 3410-01-4094U10 ................................................................................... 93C46 1Kbit Serial E²PROM .............. 3610-01-9346U11 ................................................................................... MCP101-450 reset controller .............. 3410-11-0450U12 ................................................................................... AT89C52-12JC Microprocessor ......... 3610-02-8952U13 ................................................................................... LM321 opamp ..................................... 3410-12-0321X1 ..................................................................................... 4.032 MHz HC18/U ............................ 6000-07-4032VAR1 ............................................................................... 18V MOV ........................................... 2580-02-0018Extruded aluminium case .................... 8100-01-5010Aluminium end panel ........................... 8200-04-5010ABS Plastic front panel....................... 8200-03-2502TNC PCB mount RA connector ......... 7401-02-000710ft. radio cable with DB-9F conn. ..... 7500-10-1001Shorting block for JP1 ......................... 7200-03-0102TP1, RF Ant connection ..................... 7300-13-0101Mounting bracket ................................ 9600-05-0001RF interconnect board ......................... 9100-00-00014-40 SS jack screw ............................. 8000-42-44048-32 x ¼" SS philips ............................. 8000-24-83244-40 x 3/8" SS cap screw .................... 8000-34-44064-40 SS nut .......................................... 8000-54-44004-40 x ¼" SS philips ............................. 8000-24-44042-56 x 3/16" SS philips ......................... 8000-24-25634-40 x 3/16" SS philips ......................... 8000-24-44032-56 x 1/8" aluminium spacer ............. 8000-65-2562Aluminium heat sink (U7 & U8) ......... 8400-05-0001Right Angle heat sink (RF module) ..... 8400-05-0007
5/25/2005 04:12:57p f=1.35 n:/eagle/projects/SVR200I/SVR200.BRD
5544332211D DC CB BA AVCCVCCTitleSize Document Number RevDate: Sheet of<Doc> <RevCode><Title>C11Friday, March 10, 2006TitleSize Document Number RevDate: Sheet of<Doc> <RevCode><Title>C11Friday, March 10, 2006TitleSize Document Number RevDate: Sheet of<Doc> <RevCode><Title>C11Friday, March 10, 2006270nH220nH220nHHPF LPF BPF82nH220nH 150nH 180nHRSSIRxAudio220nHRX5V43.5nHTX9V43.5nH9VDC RFCONNECTORTX9V680nH 470nH820nH470nH 330nH82nH43.5nH43.5nH43.5nH220nH100nH 100nH180nH270nH220nH 220nH270nH120nH330nH3.9uH180nH270nHComponent Type Band 1(29-38 MHz) Band 2(36-50 MHz)CapCapCapC58 56 pF HV 90 pF HVC43=C44 100 pF1 nFC55 470 pF HV 270 pF HVsee chartsee chartsee chart see chartL6 (on VCO) Ind 1.2 uH 1 uH100ppmC731uFC731uFC491nFC491nFC592.2p HVC592.2p HVC63.01C63.01R390R390R1222KR1222KFB1FB1R8100R8100C6056p HVC6056p HVL9L9C14560pC14560pR253K3R253K3C17100pC17100pC391pC391pFL1B170U15BFL1B170U15BGND1Cont Vltg2T/R Shift35VDC4MOD5PLL6Tx7GND8RX9VCO1LBVCOVCO1LBVCOC276pC276pL3L3C611N0C611N0C4220pC4220pC21.01C21.01C1047pC1047pC1147pC1147pL36L36C721uFC721uFC2333pC2333pR2947R2947C33.1C33.1C57no valueC57no valueC1270pC1270pR1839KR1839KL44L44L21S-227-5005L21S-227-5005Q42N4401Q42N4401C44C44C3712pC3712pL10L10Q6MRF4427Q6MRF4427C5222pC5222pL15S-227-5008L15S-227-5008R27 4.7R27 4.7R14470KR14470KC481N0C481N0R1647R1647C451N0C451N0C682N2C682N2R2270R2270Q5IRLMS6702Q5IRLMS6702C861N0C861N0L5L5 FL1A170U15BFL1A170U15BL47L47C751uFC751uFL2L2 L22L22C58C58R2222KR2222KL48L48C78C78Q225139-U72Q225139-U72L46L46L18S-227-5008L18S-227-5008C947pC947pR171K8R171K8L12L12RV1RV1L50L50L27L27C42100pFC42100pFC401N0C401N0L37L37C47.01C47.01C1568pC1568pC1882pC1882pC85100pC85100pR656KR656KC1982pC1982pL43L43C868pC868pC641N0C641N0R212K2R212K2C651uFC651uFC383pC383pX169.545X169.545C24.01C24.01C83C83C5656p HVC5656p HVR101KR101KR26100R26100L8L8C74.1C74.1C6710nFC6710nFC1282pC1282pR13220KR13220KC368pC368pQ7MRF1511Q7MRF1511C31.1C31.1Q185633R25Q185633R25R2439R2439C36 .1C36 .1R710KR710KL42L42FB2FB2C2215pC2215pC55C551234567891011121314JP2JP2L49L49L4L4R15100KR15100KR1100KR1100KL39L39VCC1MOD2OUT 3GND 4TCXO112.8 MHzTCXO112.8 MHzL11L11L6L6C7120pC7120p FL2455 kHzFL2455 kHzC82C82C46.01C46.01C301N0C301N0L45L45C692N2C692N2C80C80C8422p HVC8422p HVD1MMBD914D1MMBD914R1939KR1939KL19L19L41L41C268pC268pR9 39KR9 39KC76.1C76.1L40L40C16100pC16100pC6120pC6120pC661uFC661uFC621uFC621uFC54270pC54270pC41100pFC41100pFC254pC254pL7L7C341uFC341uFXTAL 1XTAL 2MIX OUT 3VCC 4LIM IN 5DECPLE 6DECPLE 7QUAD 8AUDIO9FILT IN10FILT OUT 11SQ IN12MTR DRV13MUTE14GND15MIX IN16U1MC3371DU1MC3371DR2347R2347C531N0C531N0R510KR510KR28150R28150Q3MMBFJ309Q3MMBFJ309C2812pC2812p321U3ALMV321U3ALMV321C321N0C321N0123U6MAV11U6MAV11L23L23C50470pC50470pVI1 2EN3VO 5BP 4U4MIC5205U4MIC5205C81 100pC81 100pR1122KR1122KC79C79C77 100pC77 100pC265pC265pC568pC568pC35C35L20S-227-5004L20S-227-5004C43C43C5122pC5122p123U5MAV11U5MAV11RX1GND2TX3B4O/P 5A6U7HMC226U7HMC226C295pC295pC711N0C711N0L17L17L24L24L38L38OSCIN 1OSC 2VP 3VCC 4DO 5GND 6LD 7FIN 8CLK9DATA10LE11FC12BISW13FOUT140P150R16U2MC12202DU2MC12202DR4560R4560C2027pC2027p

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