Marti Electronics SRPT-30, Руководство пользователя

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8/7/2003
40
Frequency Fine-Tune Adjust
CAUTION
THIS ADJUSTMENT HAS BEEN SET AT THE FACTORY AND SHOULD NOT REQUIRE ANY
FURTHER ADJUSTMENTS.
1. Set the SRPT-30/40A on frequency while transmitting.
2. Remove the TRANSMITTER SYNTHESIZER cover.
3. On the TRANSMITTER SYNTHESIZER board tweak the FINE TUNE FREQ ADJ (U15) while viewing a
frequency counter.
4. Re-install the TRANSMITTER SYNTHESIZER cover.
Front Panel Meter Adjust – Forward Power
CAUTION
THIS ADJUSTMENT IS ALSO MADE DURING THE FORWARD POWER CALIBRATION
ADJUSTMENT.
IT IS NOT RECOMMENDED TO PERFORM THE FORWARD POWER CALIBRATION JUST TO
ADJUST THE FRONT PANEL METER - FORWARD POWER.
1. With the SRPT-30/40A powered on and transmitting, tweak the front panel POWER ADJUST pot fully clockwise
for maximum power out.
2. Turn the front panel knob to FORWARD POWER.
3. On the FRONT PANEL CONTROL & METER board, tweak the FWD PWR pot (R48) to correlate the front panel
METER (using WATTS scale) to the WATT METER connected to the ANTENNA connector.
Front Panel Meter Adjust – Reverse Power
WARNING
THIS ADJUSTMENT SHOULD ONLY BE MADE DURING REVERSE POWER CALIBRATION.
Front Panel Meter Adjust – PA Current
1. With the SRPT-30/40A powered on and transmitting, tweak the front panel POWER ADJUST pot fully clockwise
for maximum power out.
2. On the FRONT PANEL CONTROL & METER board measure the voltage across P6 pin 8 and P6 pin 4, with the
positive lead on P6 pin 8.
3. Divide this voltage by 0.025. The result is the PA current.
4. Turn the METER SELECT knob to PA CURRENT.
5. On the FRONT PANEL CONTROL & METER board adjust the PA CURRENT pot (R50) to set the front panel
METER (using the AMPS scale) to equal the calculated current.