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

Burghardt Amateur Center BU-1000 Data Transceiver Board 87376

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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
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Document ID87376
Application IDs0Sc872MWFhUG4WePN/Khw==
Document DescriptioniNSTALLATION INSTRUCTIONS
Short Term ConfidentialNo
Permanent ConfidentialNo
SupercedeNo
Document TypeUser Manual
Display FormatMicrosoft Word - pdf
Filesize3.68kB (45998 bits)
Date Submitted2000-02-21 00:00:00
Date Available2000-04-12 00:00:00
Creation Date2001-04-09 16:36:54
Producing SoftwareAcrobat Distiller 4.0 for Windows
Document Lastmod2001-04-09 16:36:59
Document TitleMicrosoft Word - 87376
Document CreatorADOBEPS4.DRV Version 4.24
Document Author: jsoscia
FCC ID Filing: OV2BU-1000

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