Motorola HT1250LS 사용자 설명서
Transceiver Performance Testing
4-7
4.4
Receiver Performance Tests
The receiver and transmitter performance tests are contained in Table 4-5 and Table 4-6 respectively.
Refer to Chapter 5, Figure 5-1 on page 5-2, for test equipment setup. Note that all test measurements
are taken at 77
Refer to Chapter 5, Figure 5-1 on page 5-2, for test equipment setup. Note that all test measurements
are taken at 77
°
F
(
25
°
C) and in conventional or trunked models.
Table 4-5: Receiver Performance Checks
Test Name
Service Monitor
Radio
Test Set
Comments
Reference
Frequency
Mode: PWR MON
4th channel test frequency*
Monitor: Frequency error
Input at RF In/Out
TEST MODE,
Test Channel
4 carrier
squelch out-
put at
antenna
PTT to continu-
ous (during the
performance
check)
Frequency error to be
±200 Hz VHF
±600 Hz UHF
±600 Hz UHF
±60 Hz Low Band
Rated Audio
Mode: GEN
Output level: 1.0mV RF
4th channel test frequency*
Mod: 1 kHz tone at
3 kHz deviation
Monitor: DVM: AC Volts
TEST MODE
Test Channel
Test Channel
4 carrier
squelch
PTT to OFF
(center), meter
selector to
Audio PA
Set volume control to
3.16Vrms
Distortion
As above, except to distor-
tion
As above
As above
Distortion 3.0%
Typical
Sensitivity
(SINAD)
As above, except SINAD,
lower the RF level for 12dB
SINAD.
As above
PTT to OFF
(center)
RF input to be
0.25
µV
Noise
Squelch
Threshold
(only radios
with conven-
tional sys-
tem need to
be tested)
RF level set to 1mV RF
As above
PTT to OFF
(center), meter
selection to
Audio PA,
speaker/load to
speaker
Set volume control to
3.16Vrms
As above, except change
frequency to a conventional
system. Raise RF level from
zero until radio unsquelches.
out of TEST
MODE; select
a conven-
tional system
As above
Unsquelch to occur at
<0.25
µV.
Preferred SINAD =
9-10dB