PT6808 Service Manual
2. Key B and C on hand MIC—select between QT and DQT; during the transmission, select between
DTMF9 and FSSK (F120 and F180)
3. Numeric key 7 on hand MIC—turn on/off pre-emphasis (LCD on the radio displays “SCV” is on,
no icon is off)
4. Numeric key 8 on hand MIC—turn on/off voice compander (LCD on the radio displays “Z” is on,
no icon is off)
5. Numeric key 9 on hand MIC—turn on/off beat frequency (LCD on the radio displays “P” is on, no
icon is off)
6. Numeric key 6 on hand MIC—turn on/off scramble frequency (LCD on the radio displays the icon
of lock is on, no icon is off)
7. CLEAR key on the panel—turn on/off squelch (LCD on the radio displays “MON” is on, no icon
is off)
8. MONI key on the panel—select between wide band and narrow band (Display “W” when select
wide band, no icon displays when select narrow band)
(3) Parameters adjustment
A. VCO part:
Press the Key A on hand MIC to enter tuning mode, and then press Key B to enter “Sensitivity”
adjustment status.
1. Press numeric key 1 to adjust TC51, and adjust the VCO voltage (CV end) to 1.2V±0.1V.
2. Press numeric key 3 to check VCO, and adjust the VCO voltage (CV end) to
≤
4.3V.
In the adjustment mode, press Key C to enter “Low power” adjustment status.
3. Press numeric key 1 to adjust TC50, and adjust the VCO voltage (CV end) to 1.2V±0.1V.
4. Press numeric key 3 to check VCO, and adjust the VCO voltage (CV end) to
≤
4.3V.
B. TX part:
In the adjustment mode (press the Key A to turn on the radio), press Key B or C to enter the item
you want to adjust (press Key D to save the adjustment).
1. Frequency
Press the Encoder Buttons on the panel, and adjust the Tx frequency within ±100Hz of the frequency
displaying on the LCD.
2. High power
Press the Encoder Buttons on the panel, and adjust the Tx power within 20-25W.
(Numeric key 1, 2, 3, 4, 5 correspond to high, intermediate high, intermediate, intermediate low and
