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Figure 3-2. Test Cables (cont) - TM-11-5820-890-30-5_225
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TM-11-5820-890-30-5 Ground Non-Icom Radio Sets Consisting of: Receiver-Transmitter Radio RT-1439/VRC (NSN 5896-01-195-0827) Manual
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TEST  ADAPTER.  Continued - TM-11-5820-890-30-5_227


3-7. TEST  ADAPTER. TM 11-5820-890-30-5 The test adapter provides a means of routing signals to, from, and between the reference fixture and a unit under test  (UUT).  Signals  may  be  routed,  sampled,  and  changed  for  different  test  procedures. The  different  functions  of  the  test  adapter  can  be  divided  into  seven  major  areas.  They  are: Test  Equipment  I/O Reference  Fixture  I/O UUT I/O Power Supply RF Signal Routing Switching Test  Points The  interaction  of  these  areas  is  shown  in  the  block  diagram  of  figure  3-3.  A  complete  schematic  of  the  test adapter  is  shown  in  figure  FO-19.  The  following  paragraphs  discuss  the  major  functions  of  the  test  adapter. a. Test Equipment I/O.  The test equipment used with the maintenance group connects to BNC connectors mounted  on  the  test  adapter  front  panel.  The  following  list  provides  details  about  the  connections. CONNECTOR TEST EQUIPMENT FREQ  CNT Frequency  counter  input SCOPE 1 Scope  Channel  1  input SCOPE 2 Scope  Channel  2  input RF DET RF Probe used with DMM. DMM DMM MOD  GEN Output   from   modulation   generator section   of   function   generator. FCTN GEN Output   from   function   generator. EXT TRIG External  trigger  input  of  function  generator. RF SIG GEN RF  output  of  signal  generator. EXT PROBE Test  probe  supplied  with  scope. HANDSET  (six-pin  audio  connector) H-250/U  handset  included  with maintenance   group. b. Reference Fixture I/O.  AUDIO REF and ANT REF connectors are connected to the AUD/DATA and ANT connectors  of  the  reference  RT  which  is  part  of  the  reference  fixture  included  in  the  maintenance  group.  Audio signals, data signals, and control signals are exchanged with the reference RT through the AUDIO REF connector. Transmitted and received FM radio signals are exchanged with the reference RT through the ANT REF connector. c. UUT I/O. The ANT and AUDIO UUT connectors are connected to the ANT and AUDIO/DATA connectors of an RT UUT. As with the reference RT, audio, data, and control signals are exchanged through the AUDIO UUT connector  and  FM  radio  signals  are  exchanged  through  the  ANT  connector. The UUT connector is used to interface with the system connector of an RT UUT. It may be connected to several other  types  of  equipment  with  the  use  of  different  test  cables.  Power,  control,  and  communication  signals  are supplied  to  a  UUT  through  this  connector. d. Power Supply.  27.5 V dc is input to the test adapter power supply through the POWER + and - inputs of the  front  panel  (J15  and  J16).  See  figure  3-4  for  a  partial  schematic  diagram  of  this  section. 3-15


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