Service manual

10
Reference Mode: PWR MON TEST MODE, PTT to continuous Frequency error to be ≤ ±600Hz.
Frequency 4th channel test frequency
❖
4 CSQ (during the
Monitor: Frequency error performance check).
Input at RF In/Out
Power RF As above As above, 4 CSQ As above Refer to Maintenance Specifica-
tions page in front of manual.
Voice Mode: PWR MON As above, 4 CSQ As above, meter Deviation:
Modulation 4th channel test frequency
❖
selector to mic VHF, UHF, and 800MHz:
atten to –70, input to RF In/Out, ≥ 3.6kHz but ≤ 5.0kHz
Monitor: DVM, ac Volts
Set 1kHz Mod Out level for
0.025Vrms at test set,
80mVrms at ac/dc test set jack
Voice Mode: PWR MON TEST MODE, Remove modulation Press PTT switch on radio.
Modulation 4th channel test frequency
❖
4 CSQ, input Say “four” loudly into the
(internal) atten to –70, input to RF In/Out output at antenna radio mic. Measure deviation:
VHF, UHF, and 800MHz:
≥ 3.8kHz but ≤ 5.0kHz
PL Change frequency to a Conventional coded As above Deviation:
Modulation conventional transmit squelch personality VHF, UHF, and 800MHz:
(radios with frequency, BW to narrow (clear mode ≥ 500Hz but ≤ 1000Hz
conventional, operation)
clear mode, 4 TPL
coded squelch
operation only)
Talkaround Change frequency to conven- Conventional As above Deviation:
Modulation tional talk-around frequency. talk-around UHF and 800MHz: ≥ 3.8kHz
(radios with Mode: PWR MON personality but ≤ 5.0kHz
conventional, deviation, attenuation to –70, (clear mode
clear mode, input to RF In/Out operation)
talk-around Monitor: DVM, ac volts 1 CSQ
operation only) Set 1kHz Mod Out level for
25mVrms at test set.
Talkaround Change frequency to conven- Conventional As above Deviation:
Modulation tional talk-around frequency. talk-around UHF and 800MHz: ≥ 3.6kHz
(radios with Mode: PWR MON personality but ≤ 4.4kHz
conventional, deviation, attenuation to –70, (secure mode
secure mode, input to RF In/Out operation)
talk-around Monitor: DVM, ac volts Load key into
operation only) Mod: 1kHz out level for radio
(**) 25mVrms at test set. 1 sec.
Table 9. Transmitter Performance Checks
* 800MHz radios only
** The secure mode, talkaround modulation test is only required for trac mode radios which do not have clear mode talkaround capability.
❖
See Table 7.
Test System
Name Analyzer Radio Test Set Comments Name