Motorola CP140 Basic Service Manual page 34

4-4
Channel Selector
Switch Position
1 Low Power
8 High Power
2 Low Power
9 High Power
3 Low Power
10 High Power
4 Low Power
11 High Power
5 Low Power
12 High Power
6 Low Power
13 High Power
7 Low Power
14 High Power
Test Name Communications Analyzer
Reference Mode: PWR MON
Frequency
4th channel test frequency
Monitor: Frequency error
Input at RF In/Out
Rated Audio Mode: GEN
Output level: 1.0m V RF
4th channel test frequency
Mod: 1 kHz tone at
3 kHz deviation
Monitor: DVM: AC Volts
Distortion As above, except to distortion As above
Sensitivity As above, except SINAD,
(SINAD) lower the RF level for 12 dB
SINAD.
Noise RF level set to 1 mV RF
Squelch
Threshold
(only radios
with conven-
tional system
As above, except change fre-
need to be
quency to a conventional sys-
tested)
tem. Raise RF level from zero
until radio unsquelches.
*. See Table 4-4
Table 4-4. Test Frequencies
Test Channel (136-162
TX#1 or #8
136.625
RX#1 or #8
TX#2 or #9
140.325
RX#2 or #9
TX#3 or #10
145.525
RX#3 or #10
TX#4 or #11
148.875
RX#4 or #11
TX#5 or #12
153.325
RX#5 or #12
TX#6 or #13
157.875
RX#6 or #13
TX#7 or #14
161.975
RX#7 or #14
Table 4-5. Receiver Performance Checks
*
*
VHF1 VHF2
(146-174
MHz) MHz)
146.625
150.775
155.275
160.125
164.475
169.475
173.875
Radio
TEST MODE, PTT to continu-
Test Channel 4 ous (during the
carrier squelch performance
output at check)
antenna
TEST MODE PTT to OFF
Test Channel 4 (center), meter
carrier squelch selector to Audio
PA
As above
As above PTT to OFF
(center)
As above PTT to OFF
(center), meter
selection to
Audio PA, spkr/
load to speaker
out of TEST As above
MODE; select
a conventional
system
Performance Checks: RF Test Mode
UHF1 UHF 2
(403-440 (438-470
MHz) MHz)
403.625 438.625
409.775 443.775
415.275 448.275
420.125 454.125
426.475 459.475
432.475 464.475
437.875 469.875
Test Set Comments
Frequency error to be
±200 Hz VHF
±500 Hz UHF
Set volume control to
3.46 Vrms
Distortion <3.0%
RF input to be <0.30
µV (0.25 µV typical).
Set volume control to
3.46 Vrms
Unsquelch to occur at
<0.25 µV.
Preferred SINAD =
6-9 dB
UHF3
(465-495
MHz)
465.625
470.775
475.275
480.125
485.475
490.475
494.875