TP660 Service Manual
DCS frequency
deviation and
wave
1. Enter computer adjustment mode..
2. Enter the adjustment mode “DCS frequency deviation”,
3. Adjust PC software value and observe integrated
tester frequency deviation value.
4. Adjust to nominal frequency deviation: 350±50Hz.
5. Adjust the frequencies in turn.
6. Check the frequencies in turn.
350±150Hz
Modulation
distortion
Observe distortion form value
＜
3%
Tx SNR
Observe SNR form value
N:
＞
40dB.
4FSK Tx error
1.Select 3920 and put it on the DMR test interface; set
the receiver frequency as the low frequency of the radio
Tx frequency
，
Press PTT button to transmit and read the
FSK Error on the apparatus.
（
select the test average
value
）
;
2.Test the intermediate frequency and high frequency
channel with the same method.
<5%
Analog & digital
ACP
Observe adjacent channel power display value
N:
＜
-60dB.narrow
band
）
Spurious emission
Observe spectrum analyzer display value
＜
1GHz:
＜
-36dBm;
＞
1GHz:
＜
-30dBm.
6.2.4. Rx Test and Modulation
Item
Steps
Specification
Requirement
RF Rx
Sensitivity
1. Enter the computer modulation mode.
2. Enter the modulation mode”Rx sensitivity”, click frequency 1
、
3
、
5
、
7
、
9 one by one.
3. Observe the integrated tester spectrum analyzer property;
adjust PC software value, Rx SINAD
＞
12d.
4.Setting: Rx frequency -24.975MHz
（
*1
、
*2
、
*3
、
*4
）
; set the
signal ass -40dBm
，
SINAD
＜
7dB.
SINAD>=12dB
N
：
-118dBm
Page 21 of 65
Summary of Contents for TP660
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