Receiver Performance Tests; Table 3-4: Receiver Performance Checks - Motorola PR860 Basic Service Manual

Transceiver Performance Testing
3.4

Receiver Performance Tests

The receiver and transmitter performance tests are contained in Table 3-4 and Table 3-5 respectively.
Refer to Chapter 4, Figure 4-1 on page 4-2, for test equipment setup. Note that all test measurements
are taken at 77°F
Test Name
Reference
Frequency 4th channel test frequency*
Monitor: Frequency error
Rated Audio
Output level: 1.0mV RF
4th channel test frequency*
Monitor: DVM: AC Volts
Distortion
Sensitivity As above, except SINAD,
(SINAD) lower the RF level for 12dB
Noise RF level set to 1mV RF
Squelch
Threshold
(only radios
with
conventional
system need
As above, except change
to be tested)
frequency to a conventional
system. Raise RF level from
zero until radio unsquelches.
* see Table 3-3
( 25°C) and in conventional or trunked models.

Table 3-4: Receiver Performance Checks

Service Monitor
Mode: PWR MON
Input at RF In/Out
Mode: GEN
Mod: 1 kHz tone at
3 kHz deviation
As above, except to
distortion
SINAD.
Radio Test Set
TEST MODE, PTT to
Test Channel continuous
4 carrier (during the
squelch performance
output at check)
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
conventional
system
3-5
Comments
Frequency error to be
±200 Hz VHF
±600 Hz UHF
±60 Hz Low Band
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 =
9-10dB