FM540 Service Manual
3. First Level Squelch Adjustment
a.Set the RF signal as -122dBm, modulated frequency deviation as 1.5kHz. On the computer
mode(open), click OK when the value is stable.
b.Set the RF signal as -124dBm, modulated frequency deviation as 1.5kHz. On the computer mode
(close), click OK when the value is stable.
4. Field Strength
a.Set the RF signal as -120dBm, modulated frequency deviation as 1.5kHz. On the computer mode(low
RSSI), click Ok when the value is stable.
b.Set the RF signal as -70dBm and modulated frequency deviation as 1.5kHz. On the computer mode
(high RSSI), click OK when the value is stable.
6.2 Radio Test
The specifications below should be tested in test mode:
RX
1. Sensitivity: <= -120dBm(0.25uV) 12dB SINAD
2. Distortion: <=5%
3. Current: static current <=100mA
RX working current: =400mA
4.CTCSS/DCS Decoding: the radio decodes correctly when it is<= -116dBm(0.35uV)
5. Sensitivity of the 3
rd
squelch off: when RF input is
≤-124dBm, the squelch should be turned off.
6. Sensitivity of the 3
rd
squelch on: the squelch should be turned on when RF input is
≥-122dBm.
TX
1. Output Power: high (25W±2W) Middle (10W±2W)Low (5W±1W)
2. TX Current: high power transmission <= 8A middle power transmission <=5A low power
transmission <=3A
3. Maximum Frequency Deviation: 1.8kHz---2.5kHz
4. TX Distortion: <=5%
5.CTCSS/DCS Frequency Deviation: 0.3---0.5kHz with fine waves
6. TX Frequency Deviation: reference fr/-500Hz
7.DTMF Frequency Deviation: 1.5
̚
2.0 kHz
8.FFSK Frequency Deviation: /-50
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Summary of Contents for FM540
Page 1: ...FM540 Service Manual FM540 㔤 ሱ䶒 I ...
Page 89: ...FM540Service Manul Figure 2 FM540 01 Top Layer Position Diagram 136 174MHz Page 86 of 99 ...
Page 90: ...FM540Service Manul Figure 3 FM540 01Bottom Layer Position Diagram 136 174MHz Page 87 of 99 ...
Page 101: ...FM540Service Manul Figure 8 FM540KEYTop Layer Position Diagram Page 98 of 99 ...
Page 102: ...FM540Service Manul Figure 9 FM540KEY Bottom Layer Position Diagram Page 99 of 99 ...
