Pyramid Communications SVR-200M LOW POWER VEHICULAR REPEATER User Manual SVR MAN

Pyramid Communications LOW POWER VEHICULAR REPEATER SVR MAN

USERS MANUAL

Page 1SVR-200 Service ManualSVR-200Vehicular RepeaterThis manual is intended for use by qualified technicians and includes all necessary informationpertaining to the SVR-200 operation, circuit design and maintenance. Changes that occur after dateof printing will be incorporated in supplemental service publications.RF Exposure Warning:This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. Thisdevice’s provided external duel antennas must be installed in accordance with provided instructions; and it mustbe operated with minimum 20 cm spacing between the antennas and all person’s body (excluding extremitiesof hands, wrist and feet) during wireless mode of operation. Further, this transmitter must not be co-locatedor operated in conjunction with any other antenna or transmitter.
Page 2SVR-200 Service ManualForewordScope of this manualThis manual contains the specifications, functional description, operating instructions, schematic, partslocator and 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 willbe reflected in future releases of this service manual. Specifications and circuit changes are subject to changewithout prior 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 explosiveenvironmental conditions.•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 mustapply for a license to operate the SVR-200 transmitter pursuant to parts 90.243 and 90.247. Other FCC rulesmay apply depending on the class of service the user qualifies for. A complete listing of FCC rules andregulations may be ordered from:Superintendent of DocumentsGovernment printing officeWashington DC 20402The following information pertaining to the SVR-200 should be included in the FCC license application:VHF UHF 800 MHzType Acceptance: LRUSVR-200VB LRUSVR-200UD LRUSVR-200MAOutput Power: 0.25-2.0W 0.25-2.0W 0.1-1.0WEmission designator: 11K0F3E/16K0F3E 16K0F3E 11K0F3E/16K0F3EFrequency band: 150-174 MHz 450-490 MHz 850-870 MHzNumber of Channels: One One One
Page 3SVR-200 Service ManualSpecificationsTransmitter:VHF UHF 800Frequency Range: 150-174 MHz 450-490 MHz 850-870 MHzRf power out: 250mW - 2W 250mW - 2W 100mW - 1WSpurious emissions: -50dbc -52 dbc -50dbcFreq stability -30°~+60°C: 3 PPM 5 PPM 1.5 PPMModulation: 11K0F3E 1 /16K0F3E 16K0F3E 11K0F3E1/16K0f3EHum and Noise: -40db -40db -40dbAudio response (300-3kHz): Flat or +6dB/octave Flat or +6dB/octave Flat or +6dB/octaveAudio distortion: <3% @ 60% deviation <3% @ 60% deviation <3% @ 60% deviationLocal mic sensitivity: 300mV-5VPP 300mV-5VPP 300mV-5VPPFCC Type Acceptance: LRUSVR-200VB LRUSVR-200UD LRUSVR-200MAIndustry Canada Approval: Pending 2390 212 113A PendingReceiver:Frequency Range: 150-174 MHz 450-490 MHz 850-870 MHzRF sensitivity: .4µV .35µV .35µVSquelch sensitivity .2µV to 2µV adjustable .2µV to 2µV adjustable .2µV to 2µV adjustableModulation acceptance: ±3.75 1 /±7.5kHz ±7.5kHz ±3.75 1 /±7.5kHzSelectivity: 60db 60db 60dbSpurious/image rejection: 60db 60db 60dbIMD response: 60db 60db 60dbFrequency stability: 3 PPM 5 PPM 1.5 PPMAudio response (300-3kHz): Flat or -6db/octave Flat or -6db/octave Flat or -6db/octaveAudio output: 0-5VPP AC coupled 0-5VPP AC coupled 0-5VPP AC coupledLocal Rx Audio: 400 mW 8 Ohms 400 mW 8 Ohms 400 mW 8 OhmsPower Requirements:DC Supply 13.6 VDC 13.6VDC 13.6VDCStandby 170 mA 170mA 170mAReceive 250 mA 250mA 250mATransmit 800 mA @ 2W 1.1A @ 2W 700mA @ 1WPhysical:Dimensions: 5.275"W x 6"L x 1.12"HWeight: 18 oz.Case: One piece extruded aluminium1 Narrowband operation is special order
Page 4SVR-200 Service ManualFunctional DescriptionGenerally, vehicular repeaters are used as mobile extenders in cross-band operation: the link isVHF/UHF/800 MHz simplex and the mobile is Lo-band, VHF, UHF or trunking. In-band operation is possible,but care must be taken to prevent interference between the mobile's higher power transmitter and the repeaterreceiver. Proper frequency selection and antenna placement are important even in cross-band operation, butespecially for inband use. The use of low power pre-selector cavities may be placed in line with the repeaterantenna cable since it is simplex and low 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,or if other repeaters are transmitting. The handhelds must transmit CTCSS, but should be carrier squelchreceive. The handhelds should not use CTCSS decode if the repeater is utilizing the multi-vehicle format,as this will interfere with the priority sampling which is essential for multi-vehicle operation. Also, thehandhelds would have to have different encode and decode tones in order for the repeater to be able to tell thedifference between handhelds and other repeaters, so the handhelds would not be able to hear each other. Therepeaters should not transmit 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 onthe handheld’s receive frequency. The user is able to hear and respond to all radio traffic, including otherhandhelds at the site. The SVR-200 can be programmed to give the handhelds priority in a conversation byperiodically sampling for handheld activity (carrier and proper tone) during base to handheld transmissions.During sampling, if the SVR-200 detects a handheld transmission, it will cease transmissions, key the mobileradio and repeat handheld to base. This allows the handheld to respond during repeater hang time or duringfull duplex interconnect calls. Priority sampling can be enable/disabled through PC programming and theinterval can be programmed between .25 seconds and 2.5 seconds in .25 second increments.The SVR-200 has a fixed 3 minute time out timer for base to handheld transmissions. If the mobile CORis active for more than 3 minutes (and the SVR-200 is the priority unit) it will send a double blip and ceasetransmission until the mobile COR is inactive. The 3 minute time-out is in affect regardless of whether theSVR-200 is programmed 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 handheld or handheldto base transmissions. If another unit arrives on scene and is activated, it too will transmit the “lock tone”;when the first SVR-200 detects the lock tone from the second unit, it will increment a “priority counter” andwill no longer repeat any transmissions. The recently arrived unit will be the priority repeater, and the firstunit will be 1 count away from priority. This process will continue for each unit that arrives at the site, creatinga priority hierarchy for up to 256 vehicles, each with a unique count and only one unit at priority status. TheSVR-200 will not transmit it’s lock tone if the radio channel is busy when first enabled. It will wait innon-priority status until all transmissions cease, then send 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 foractivity. If the priority unit were to leave the scene or become disabled, the other units will detect the conditionto repeat and determine that there is no priority unit repeating the transmission. They will then begindecrementing their priority counters until one of them reaches the priority status and begins repeating thetransmission. Since the SVR-200s are all at different counts, only one will reach priority status and begintransmitting. The other units will sense the new priority repeater and cease counting down, preserving thepriority 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 mobileradio using the local mic, the SVR-200 will detect the local PTT and repeat the transmission to the otherhandhelds so that both sides of the conversation will be heard by everyone on the link. The local mic repeatfunction can be enabled/disabled via the PC software.The SVR-200 also has a local receive audio speaker jack that enables the person in the vehicle to monitorhandheld to base transmissions that are being repeated through the mobile.If the users wish to communicate handheld-handheld without accessing the mobile repeater, they maytransmit on the same frequency without CTCSS (or a different CTCSS); the SVR-200 only responds to carrierand proper tone 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 notsee the radio transmit at all (system is busy), it will send a low tone to the hand held operator to alert them thatthe system is busy. The SVR-200 will automatically retry every 5 seconds and send busy tone to the handheldwith each unsuccessful attempt to indicate progress of the call attempt. If unsuccessful after 30 seconds, theSVR-200 will transmit 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 untilthe transmitter 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 andtransmit a go-ahead blip to the handheld operator. The user then keys their handheld to speak on the voicechannel. If the user does not key up within the 2 second period, the SVR-200 will unkey the mobile and sendintercept tone as before.If the user keys their handheld only once, or they key the first time for more than 1 second, the SVR-200will cancel the call attempt and send intercept tone to the handheld operator. All of the queuing and error toneswill only be 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 handheld to base.RTX: Repeater transmit indicator.MCOR: Mobile unmute detector indicating a condtion to repeat base to handheld.MTX: Mobile transmit indicator.OPT: Should be on steady during programming operations only. If OPT LED flashes at 10Hz rate, itis an indication 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 8-13 of this manual. Additionally, ensure that the SVR-200 jumpers are properlyconfigured for 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, outputamp U1B will have an adjustment range of 0-100 mVPP. If J1 is removed, U1B can be adjusted between0-5VPP.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 outputimpedance is 2.2Kohms. Install the jumper for radios that require a lot of modulation drive or that havelow impedance microphone circuits. Remove the jumper if the SVR-200 installation decreases localmicrophone audio at the mobile.J3 Used for testing the SVR-200 receiver and setting the lock tone deviation transmit level. If JP3 is shortedat power 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 normaloperation.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) to the 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). Ifconnected after pre-emphasis, ensure that the SVR-200 transmit audio path is programmed as flat.Pin 2 is AC coupled and has an output impedance of 600 or 2.2Kohms (determined by J2). RV3sets the transmit audio output level and J1 sets the adjustment range between 0-5VPP (J1 open) or0-100mVPP (J1 shorted).Black/ShieldWhite
Page 7SVR-200 Service ManualPin 3: Remote enable/disable. Connect to the radio's auxiliary output or a separate switch to remotelyenable or disable the repeater. If this line goes high to activate the repeater, ensure that JP1 is setto the “+” position. If this line goes to ground, set JP1 to the “-” position. J8 has two positionsto add a pull up (+) or pull down (-) resistor to this line if used with an open collector or dry contactoutput.Pin 4: Mobile PTT output. Connect to mic PTT on the mobile radio, or a line that goes active low totransmit. 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 least1.5A of 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 asflat (common data). If connected after de-emphasis, program the receive path for pre-emphasis.Pin 6 is AC coupled and high impedance (>15K ohm). RV5 sets the receive audio level sensitivity;this input should be between 30mVPP and 5VPP. J7 sets the gain of the receive input amp. If open,the input has 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 havebeen detected or the audio unmute line. If this line goes more positive during an unmute condition,program the mobile COR line as active high (common data). If the line goes more negative duringan unmute condition, program the mobile COR line as active low. The input from pin 7 is highimpedance and does not have to go rail to rail. The SVR-200 uses a voltage comparator as a CORthreshold detector. RV1 sets the mobile COR threshold level and should be set for half way betweenthe mute and unmute levels at 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 programthe 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 thisline to the mobile transmitter audio path before limiting or filtering. This input is AC coupled andhigh impedance (>5.6Kohms). The input level at this pin should be 300mV to 5VPP. RV2 setsthe local mic sensitivity. If the mic high line has sufficient drive for this input, install J4 and leavepin 8 unconnected. 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 theair. This is not the same as mic PTT. If pin 9 goes positive during transmit, program the on-airdetect line for active high (common data). If pin 9 goes to ground during transmit, program theon air detect line for active low.Conventional: Used for local mic repeat indication from the mobile. Connect pin 9 to pin 4 ofthe SVR-200 and program the on-air detect line for active low. Solder jumper J5 will connect pin9 to pin 4 (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 vsion or constitute a hazard duringa vehicle collision. The SVR-200 mounts in the bracket using the four 8-32 x ¼" machine screws. Do notuse longer screws to mount the SVR-200 to the bracket or ciruit damage may result.BlueGreenRedYellowVioletBrownGray

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