14
Table 10 Transmitter Performance Checks
TEST
NAME
COMMUNICATIONS
ANALYZER
RADIO TEST SET COMMENTS
Reference
Frequency
Mode: PWR MON
4th channel test frequency◊
Monitor: Frequency error
Input at rf In/Out.
TEST MODE,
4 CSQ
PTT to continuous
(during the
performance
check).
Frequency error to be < 150Hz.
Power RF As above. As above, 4
CSQ
As above. Refer to Maintenance Specifica
tions page in front of manual.
Voice
Modulation ∆
Mode: PWR MON
4th channel test frequency◊
atten to –70, input to RF In/Out,
Monitor: DVM, AC Volts Set 1kHz
Mod Out level for 0.025Vrms at test
set, 80mVrms at AC/DC test set jack
As above, 4
CSQ
As above, mete
selector to mic.
Deviation:
VHF, U HF, and 800MHz:
≥ 3.6kHz but ≤ 5.0kHz.
Low-Speed
Data Modulation
800/900 UHF
As above. TEST MODE
4TLS
output at
antenna
PTT to continuous
(during the
performance
check).
Deviation:
UHF, 800MHz: ≥ 500Hz but
≤ 1000Hz.
Voice
Modulation
(internal) ∆
Mode: PWR MON
4th channel test frequency◊
atten to –70, input to RF In/Out.
TEST MODE,
4 CSQ,
output at
antenna.
Remove
modulation
input.
Press PTT switch on radio.
Say “four” loudly into the
radio mic. Measure deviation:
VHF, U HF, and 800MHz:
≥ 3.8kHz but ≤ 5.0kHz.
900MHz: ≤ 2.5kHz.
High-Speed
Data
Modulation***
As above. TEST MODE,
4 THS,
output at
antenna.
PTT to continuous
(during the
performance
check).
Deviation:
UHF and 800MHz:
≥ 2.4kHz but ≤ 3.6kHz.
900MHz: ≥ 1.52kHz but ≤ 1.95kHz.
DTMF
Modulation
As above,
4th channel test frequency◊
TEST MODE,
4 DTMF,
output at
antenna.
As above. Deviation:
VHF, U HF, and 800MHz:
≥ 3.05kHz but ≤ 3.45kHz.
900MHz: ≥ 1.5kHz but ≤ 1.9kHz.
PL/DPL
Modulation
(radios with
conventional,
clear mode,
coded squelch
operation only)
Change frequency to a
conventional transmit
frequency, BW to narrow.
Conventional
coded squelch
personality
(clear mode
operation).
4 TPL
4 DPL
As above. Deviation:
VHF, U HF, and 800MHz:
≥ 500Hz but ≤ 1000Hz.
900MHz: ≥ 250Hz but ≤ 500Hz.
Talk-around
Modulation
(radios with
conventional,
clear mode,
talk-around
operation only
Change frequency to conventional
talk-around frequency.
Mode: PWR MON
deviation, attenuation to –70,
input to RF In/Out
Monitor: DVM, AC volts
Mod: 1kHz Out level for 25mVrms
at test set.
Conventional
talk-around
personality
(clear mode
operation).
1 CSQ
As above. Deviation:
UHF and 800MHz: ≥ 3.8kHz
but ≤ 5.0kHz.
900MHz: ≥ 1.95kHz but
≤ 2.45kHz.
Talk-around
Modulation
(radios with
conventional,
secure mode,
talk-around
operation only
(**)
Change frequency to conventional
talk-around frequency.
Mode: PWR MON
deviation, attenuation to –70,
input to RF In/Out
Monitor: DVM, AC volts
Mod: 1kHz Out level for 25mVrms
at test set.
Conventional
talk-around
personality
(secure mode
operation).
Load key into
radio
1 Sec.
As above. Deviation:
UHF and 800MHz: ≥ 3.6kHz
but ≤ 4.4kHz.
* 800 MHz radios only
** The secure mode, talk-around modulation test is only required for trac mode radios which
do not have clearmode talk-around capability.
*** Trunked Only
∆ When testing voice modulation in the continuous mode, AGC must be disabled.
◊ See Table 6 or Table 8 as applicable.
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