Motorola MTX150 Supplement To Basic Service Manual - Page 28

Browse online or download pdf Supplement To Basic Service Manual for Portable Radio Motorola MTX150. Motorola MTX150 44 pages. Professional portable radio

Motorola MTX150 Supplement To Basic Service Manual
4-4
Test Name
Reference
Mode: PWR MON
Frequency
4th channel test frequency*
Monitor: Frequency error
Input at RF In/Out
Rated Audio
Mode: GEN
Output level: 1.0mV RF
4th channel test frequency*
Mod: 1kHz tone at
3kHz deviation
Monitor: DVM: AC Volts
Distortion
As above, except to distor-
tion
Sensitivity
As above, except SINAD,
(SINAD)
lower the RF level for 12dB
SINAD.
Noise
RF level set to 1mV RF
Squelch
Threshold
(only radios
with conven-
tional sys-
tem need to
As above, except change fre-
be tested)
quency to a conventional
system. Raise RF level from
zero until radio unsquelches.
* See Table 4-4 of Basic Service Manual 68P80906Z54 for Test Frequencies.
Table 4-1.
Receiver Performance Checks
Service Monitor
Radio
Test Set
TEST MODE,
PTT to continu-
Test Channel
ous (during the
4 carrier
performance
squelch out-
check)
put at
antenna
TEST MODE
PTT to OFF
Test Channel
(center), meter
4 carrier
selector to
squelch
Audio PA
As above
As above
As above
PTT to OFF
(center)
As above
PTT to OFF
(center), meter
selection to
Audio PA,
speaker/load to
speaker
out of TEST
As above
MODE; select
a conven-
tional system
Transceiver Performance Testing
Comments
Frequency error to be
±600 Hz UHF
Set volume control to
3.16Vrms
Distortion 3.0%
Typical
RF input to be
0.25µV
Set volume control to
3.16Vrms
Unsquelch to occur at
<0.25µV.
Preferred SINAD =
8dB