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TP620 Service Manual
6.2.4. Rx Test and Modulation
Item
Steps
Specification
Requirement
RF Rx
Sensitivity
1. Enter the computer tuning mode.
2. Enter the tuning 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
Squelch
level9 on
1. Enter the computer tuning mode.
2. Set the channel as current test frequency.
3. Enter the tuning mode ”SQL9 on”, click start and switch to the
next frequency when the number is stable.
4. Adjust frequency 1, 3, 5, 7, 9, one by turns.
Input -115dBm to
turn it on,-120dm
to turn it off
Squelch
level9 off
1. Enter the computer tuning mode.
2. Set the channel as current test frequency.
3. Enter the tuning mode ” SQL9 off ”,
click start and switch to the
next frequency when the number is stable.
4. Adjust frequency 1, 3, 5, 7, 9, one by turns.
Squelch
level1 on
1. Enter the computer tuning mode.
2. Set the channel as current test frequency.
3. Enter the tuning mode ”SQL1 on ”, click start and switch to the
next frequency when the number is stable.
4. Adjust frequency 1, 3, 5, 7, 9, one by turns.
Input -115dBm
and turn
on,-120dm and
turn off
Squelch
level1 off
1. Enter the computer tuning mode.
2. Set the channel as current test frequency.
3. Enter the tuning mode ” SQL1 off ”, click start and switch to the
next frequency when the number is stable.
4. Adjust frequency 1, 3, 5, 7, 9, one by turns.
Rx
Distortion
Observe SNR form value.
<3% (4 bars)
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