User Manual

38
WARNING
IF THE 15-30 VOLT SUPPLY IS LESS THAN 16 VOLTS, THE B+ ADJUST SHOULD BE SET TO 12
VOLTS.
THIS MAY LIMIT THE MAXIMUM OUTPUT POWER AND FREQUENCY RANGE.
Frequency Measurement
The RF output frequency of this transmitter should be measured as often as necessary to insure on-frequency
operation and to comply with regulations. Monitor the RF output with a frequency counter via an RF coupler or Watt
meter.
WARNING
NEVER CONNECT THE FREQUENCY COUNTER DIRECTLY TO THE RF OUTPUT CONNECTOR
OF THE SRPT-30/40A.
THE FREQUENCY COUNTER SHOULD BE COUPLED OFF OF AN RF COUPLER OR A WATT
METER.
EXCEEDING THE INPUT POWER RATING OF THE FREQUENCY COUNTER COULD DO
INTERNAL DAMAGE TO IT.
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.