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TM 11-5820-890-20-2
1-52
1.23.
TYPICAL SC TEST SETUP. Continued
For testing RF in SC mode, use the following test setup for short range radios:
RT
J1
ANT
RADIO
DUMMY LOAD
TEST SET
50
TEST SET CABLE
*
* INDICATES ANTENNA DISCONNECTED
For testing RF in SC mode, use the following test setup for long range radios:
ANT
RADIO
DUMMY
TEST SET
LOAD
RT
J1
J1
J2
PA
50
TEST SET CABLE
*
* INDICATES ANTENNA DISCONNECTED
1.24.
HANDSET, H 250.
Troubleshooting requires that you have a known good handset. This may be hard to determine, if the radio you
are working on is not operational. If you have doubt about your handset check it with your test set.
PHONE ELEMENT
PUSH TO TALK
RELEASE TO LISTEN
SWITCH
(PTT)
MICROPHONE ELEMENT
AUDIO PLUG
MIKE
GROUND
KEY
PHONE
A
E
D
C
B
E
D
A
C
B
Audio Check
Circuit disturb between pin A and B of the handset's audio connector. A clicking
sound should be heard in the phone element.
Keying Check
Connect meter leads between pin A and pin C of handset's audio connector. Press
handset PTT switch. Meter should read zero (0) ohms. Release handset PTT
switch. Meter should read infinity ohms.
Microphone Element
Connect meter leads between pin A and pin D of handset's audio connector. Press
and release handset PTT switch. Resistance reading should change from 1 (infin
ity) to between 50 and 150 ohms.
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