DP485 Service Manual
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b. RF signal is set to -123dBm, modulated frequency deviation to 3.0kHz/1.5kHz (wide/narrow ban). Under
computer mode (SQL off, narrow/wide band) (five frequencies), click Ok when the value is stable.
7.2.Radio Test
(1) Voltage used in test: 7.5V +/-0.1V room temperature
(2) Frequency range: 136~ 174MHz,400 ~470MHz
The specifications should be tested in the test mode:
Rx Section
1. Sensitivity: <=-119dBm (0.25uV) (wide band, narrow band) 12dB SINAD
2. Distortion: <=5%
3. Current: static current :<=100mA
Received working current: <=400mA
4. Squelch off Sensitivity: when RF input ≤-124dBm, squelch off.
5. Squelch on Sensitivity: when RF input ≥-119dBm, squelch on.
Tx Section
1. Output Power: high (3.8W---4.8W) low (0.7W---1.3W)
2. Tx Current: high power Tx<= 1.6A; low power Tx <=1.0A
3. Tx Distortion: <=5%
4. Tx Frequency Deviation: reference fre/-500Hz
5. Undervoltage Indication: when voltage is 6.2V, the red indicator should flash when pressing PTT, and no
Tx power occurs.
