DP580 Service Manual
7.1.2.Modulation in PC Test Mode
Tx Frequency
Run the debugging software on the PC, set the all-purpose tester to adjustment mode, select [Frequency
Stability], and adjust to a maximum transmitting frequency of 100Hz above the rated frequency and a
minimum one of 100Hz below the rated frequency.
Tx Power
a. Run the debugging software on the PC, set the all-purpose tester to adjustment mode, select [High
Power] (at low, medium and high frequency points respectively), and adjust to a high transmitting frequency
of 3.5~4.5W.
b. Run the debugging software on the PC, set the all-purpose tester to adjustment mode, select [Low
Power] (at low, medium and high frequency points respectively), and adjust to a low transmitting frequency
of 0.7~1.5W.
Threshold of Low Battery
Run the debugging software on the PC, set a supply voltage of 6.8V, set the all-purpose tester to
adjustment mode, and then start testing. Wait until the reading is stable, and then stop testing.
MOD1
Run the debugging software on the PC, set the all-purpose tester to adjustment mode and TX state, adjust
the values of the debugging software, and observe the frequency deviation at a tester frequency of 0.1KHz.
If the deviation is 5K±80Hz, stop adjusting the PC Tool parameters.
MOD2
Set the all-purpose tester to adjustment mode and TX state, adjust the values of the debugging software,
and observe the frequency deviation at a tester frequency of 6KHz. If the deviation is 5K±80Hz, stop
adjusting the PC Tool parameters.
4FSK BER
Set a frequency for the all-purpose tester, set the tester to adjustment mode, and then modify respectively
the values of the debugging software for digital MOD1 and fro MOD2. When 4FSK frequency deviation is
1944±100Hz and the ERROR is below 5%, and then stop adjustment.
7.2.Radio Test
After repair, test the following indexes.
Rx Part
1. Sensitivity: <=-119dBm (0.25uV) (wide band and narrow band) &12dB SINAD.
2. Squelch Off Sensitivity: When RF input is ≤-124dBm, squelch should be off (squelch level: 3).
3. Squelch On Sensitivity: When RF input is ≥-119dBm, squelch should be on.
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