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TEST  ADAPTER.  Continued - TM-11-5820-890-30-5_228
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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_230


TM 11-5820-890-30-5 3-7. TEST ADAPTER.  Continued Diode  CR1  prevents  test  adapter  damage  from  accidental  reversal  of  the  power  supply  inputs. Voltage regulators U1, U2, and U3 convert the input voltage to the voltages used by the UUT. The 1.5 V supply is provided  by  a  voltage  divider  composed  of  R12  and  R13  tapped  into  the  6.75  V  supply  line. All  resistors  used  by  the  power  supply,  except  for  R3,  are  mounted  on  the  test  adapter  power  supply  CCA (18A1). e.  RF  Signal  Routing.  This  section  routes  RF  signals  to  and  from  the  reference  radio  and  UUT  antenna connectors  and  the  test  equipment. Relays K1, K2, and K3 control the flow of the RF signals. Each is controlled by the RF switch (S3). 27.5 V dc is supplied  to  the  positive  control  lead  (+)  of  each  relay.  Each  relay’s  negative  control  lead  (-)  may  be  connected to GND through the RF switch. When the negative control lead is grounded, current flows through the relay coil, shifting  the  relay  output  from  the  NC  output  to  the  NO  output. Attenuators AT1 and AT2 decrease the signal strength of RF signals input from either the reference or UUT RTs. This prevents damage to an RT from a high power input signal. AT3 provides a 50-ohm matching impedance to the RF DET output. f.  Switching.  The  switching  section  is  composed  of  a  variety  of  switches  which  perform  signal  routing functions. Table 3-1 describes them and their uses. The switches are shown in detail in the schematic of FO-19. Table  3-1.  Test  Adapter  Switches NAME  (NUMBER) FUNCTION TEST EQPT Routes  signals  for  testing  to  test  equipment  (to  frequency SELECTOR  (S1) counter,  DMM,  scope  channel  1,  or  handset). BASEBAND  (S2) Sets conditions on the AUDIO REF and AUDIO UUT connectors for RF SWITCH (S3) Selects LOGIC  (S4) Selects STIMULUS  (S5) Selects or REF several  audio  and  data  operation  modes: SETTING MODE 1 UUT RT transmits digital data 2 UUT RT receives digital data 3 Either  RT  transmits  or  receives  audio 4 UUT RT transmits analog data 5 UUT RT receives analog data different  RF  paths  for  signals  from  either  UUT  or  REF  RT. different  combinations  of  voltage  and  GND  to  be  sent  to  UUT. paths  for  input  of  function  generator  or  handset  signals  into  UUT RT. RESPONSE (S6) Two-deck  switch  which  selects  signal  from  UUT  or  REF  RT  for  testing by  the  test  equipment. 3-18


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