PT6808 Service Manual
Tx part
1. Output power: high (20.0W—25.0W) low (4.0W—7.0W)
High, intermediate, and low frequency point
MOD.: 1KHz
DEV.: ±3kHz
Red LED indicator lights on while transmitting.
2. Transmitting current: high
≤
7.0A, low
≤
3.0A
3. Max. deviation (pre-emphasis is on)
4.3kHz—4.7kHz (wideband)
1.9kHz—2.2kHz (narrowband)
MOD: 1kHz/120mV
4. Modulation sensitivity (pre-emphasis is on, and MIC input is 1kHz/12mV)
2.2—3.8kHz (wideband)
1.2—1.8kHz (narrowband)
5. Transmission distortion (pre-emphasis is on)
MOD: 1kHz, DEV.: 3kHz,
＜
3%
6. QT deviation
0.50 kHz—0.85kHz (wideband)
0.25kHz—0.5kHZ (narrowband)
The waveform should be good.
7. DQT deviation
0.50 kHz—0.85kHz (wideband)
0.25kHz—0.5kHZ (narrowband)
The waveform should be good.
8. Tx deviation
Nominal frequency ±200Hz
9. Modulation feature: +3dB/-3dB
10. Tx harmonic wave suppression
≥
80dB
11. Frequency stability: ±2.5ppm
The voltage of all the tests above is 13.8V ± 0.1V under ambient temperature.
Frequency range: 350MHz—390MHz
