Burghardt Amateur Center BU-1000 BU-1000 Data Transceiver Board User Manual 87376

Burghardt Amateur Center BU-1000 Data Transceiver Board 87376

iNSTALLATION INSTRUCTIONS

BU-1000 INSTALLATIONThe BU-1000 has a 5 pin connector for hookup to the MRU(meter reading unit)modem and a BNC connector for connection to a half wave dipole. The Pin-out ofthe 5 pin connector is as follows.1)PTT(push to talk)2)12V(regulated 12 volt input)3)mod in(modulation input)4)RXA(receiver audio output)5)GND(ground)
THEORY OF OPERATIONThe BU-1000 is a low power data transceiver.RECEIVER SECTIONThe receiver is a double conversion superhetrodyne design. When in the receivemode, signal is allowed to pass to Q1 RF AMP where it is amplified and sent toU1 for the first mix. X2 is a 3rd overtone crystal which is tripled by Q2 to producethe first mix frequency. The first mixer is located in U1 and produces a 10.7MHZfirst IF. X1 produces the 2nd mix frequency of 10.245MHZ. It is mixed in U1 toproduce a 455KHZ 2nd IF frequency. Receiver audio is then detected in U1 toproduce RXA out.TRANSMIT SECTIONModulation is applied to D3 varactor and is used to shift the frequency of X201 toproduce FM modulation. X201 is a 3rd overtone crystal. Its frequency is tripled byQ241 to give the apropriate output frequency. It is then amplified by Q242predriver and Q243 final. It is passed through D440/441 switching when intransmit mode and from there applied to the antenna.BU-1000 SPECIFICATIONSGENERALFREQUENCY COVERAGE:1 CHANNEL(173.20375/173.21/173.2375/173.2625/173.2875/173.3125/173.3375/173.3625/173.39/ OR 173.39625 MHZ)TX CURRENT DRAW: 250MARX CURRENT DRAW: 120MARECEIVERSENSITIVITY: 10DB SINAD AT .8UVAUDIO OUTPUT LEVEL: 2VPP AT 3KHZ DEVIATION1ST IF FREQUENCY: 10.7 MHZ2ND IF FREQUENCY: 455 KHZTRANSMITTERPOWER: 250MW
BU-1000 DATA TRANSCEIVER BOARD PARTS LISTVERSION 2RECEIVER SECTIONC2,8,10,11,13,16,17,18,19,20,23,24 .1UF NEWARK 07WX6808 C6 33PF DIGIKEY PCC330CCT-NDC7 18PF DIGIKEY PCC180CCT-NDC14 120PF DIGIKEY PCC121CCT-NDC4 4.7PF DIGIKEY PCC4R7CCT-NDC15 47PF DIGIKEY PCC470CCT-NDC5 22PF DIGIKEY PCC220CCT-NDC12 1UF TANTILUM NEWARK 93F2694C3 100PF DIGIKEY PCC101CCT-NDC25 1000PF DIGIKEY PCC102BCT-NDC21 2200PF DIGIKEY PCC222BCT-NDR6,2 470 NEWARK 07WX0214R10,12 39K NEWARK 08WX8266R3,7,8 1K NEWARK 07WX0211R4 5.6K NEWARK 08WX8274R5 15K NEWARK 08WX7826R1 100K NEWARK 96F6995R100.0KR9 10K NEWARK 08WX8237R11,13 22K NEWARK 08WX8252R14 330 OHM 1/2 WATT DIGIKEY 330H-NDFL1 E10.7V NEWARK 87F2439FL2 455KHZ NEWARK 90F2264L1 43NH DIGIKEY DN4010-NDL2 1.5UH DIGIKEY TK1412-NDL3 .108UH DIGIKEY TK2713-NDL4 .64MH DIGIKEY TK1302-NDU1 MC13135DW NEWARK 07F2896U2 78L05ACP NEWARK 07F7397X1 10.245 MHZ BOMARX2 SELECTED BOMAR Q1 MRF901 NEWARK 08F1298Q2 2N3904 NEWARK 09F5663 ZD1 6.8 V 1/2 WATT ZENER NEWARK 09F4090TRANSMITTER SECTIONC265,252,259,260,261,263,272 .1UF NEWARK 07WX6808 C253,254 47PF DIGIKEY PCC470CCT-NDC255 18PF DIGIKEY PCC180CCT-ND C262,250 220PF DIGIKEY PCC221BCT-NDC267 2.2PF DIGIKEY PCC2R2CCT-ND C271,273 1000PF DIGIKEY PCC102BCT-NDC268 .01UF DIGIKEY PCC103BCT-ND R210 470 OHM NEWARK 07WX0214R212 15K NEWARK 08WX7826 R221,216,211,217 1K NEWARK 07WX0211R214 5.6K NEWARK 08WX8274 R215,220 18K DIGIKEY P18KECT-NDR219,223 100K NEWARK 96F6995R100.0K R222,218 10 OHM DIGIKEY P10ECT-NDR224 4.7K DIGIKEY P4.7KECT-ND R225 330 OHM 1/2 WATT DIGIKEY 330H-ND
R226 150 OHM DIGIKEY P150ECT-ND L290 1.5UH DIGIKEY TK1412-NDL291 .137UH DIGIKEY TK2714-ND L292,296,297,299 43 NH DIGIKEY DN4010-NDL294,300 1UH DIGIKEY PCD1131CT-ND L295 .241UH DIGIKEY TK2707-NDL293 .375UH DIGIKEY TK2729-ND L298 .211UH DIGIKEY TK2706-NDQ242,241 MRF901 NEWARK 08F1298 Q243 2N4427 NEWARK 10WX2083X201 SELECTED ZD2 6.8V ZENER NEWARK 09F4090D3 MV2105 VARACTOR NEWARK 08F2197COMMON SECTIONR401,402,403,400 1K NEWARK 07WX0211C460,461 .1UF NEWARK 07WX6808L475 56UH DIGIKEY PCD1106CT-NDD440,441 MPN3404 NEWARK 07F9506Q450 2N3906 DIGIKEY 2N3906DICT-NDLED1 GREEN LED DIGIKEY 67-1059-NDLED2 RED LED DIGIKEY 67-1065-NDCN1 5 PIN JACK DIGIKEY H2097-NDCN2 BNC JACK DIGIKEY ARF1178-ND2 PIN JACK(OPTIONAL) DIGIKEY H2094-ND 5 PIN PLUG(ACCESSORY) DIGIKEY H2086-ND2 PIN PLUG(OPTIONAL) DIGIKEY H2083-ND PINS(ACCESSORY) DIGIKEY H2138-NDVERSION 2(173 MHZ)C1 56PF DIGIKEY PCC560CT-NDC258,221 3.9PF DIGIKEY PCC3R9CCT-NDC9,222 2.2PF DIGIKEY PCC2R2CCT-NDC224 3.3PF DIGIKEY PCC3R3CCT-NDC257,251 33PF DIGIKEY PCC330CCT-ND C256 8.2PF DIGIKEY PCC8R2CCT-NDC269 6.8PF DIGIKEY PCC6R8CCT-ND C264 18PF DIGIKEY PCC180CCT-ND

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