Motorola Portable Radios 用户手册

Transceiver Performance Testing

4-7

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

°

F

(

25

°

C) and in conventional or trunked models.

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

±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 

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