Manualshelf

Specifications

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Drive power value lost!
Notes
(a) If you don't have Relay control by TRX-Manager, please set up your amplifier to
Standby/Operate manually and press OPR to indicate TRX-Manager in which configuration you are
running your amplifier.
(b) If you don't have control of Drive power by TRX-Manager, it is probable you will have to repeat
this sequence each time you Tune. In that case, this function is of no great interest...
Linear computer assisted Tune
A properly tuned linear amplifier has a constant power gain regardless of the antenna
impedance. A Tuning method which optimizes Gain is generally more precise than the usually
used plate "dip" (which is nearly unusable with tetrodes and pentodes) or just maximum output
etc. Such method is offered by some high-end amplifiers (Nominal gain alternative method).
This method consists of tuning your amplifier for a NOMINAL gain by using the LOAD capacitor while
you adjust the TUNE capacitor for the maximum output. The NOMINAL gain is a specification which
has to be known before you start tuning. In fact even if you don't use this method, reading the gain while
you are tuning is a very fast way to know if your amplifier is properly tuned.
It is possible to proceed as follow:
1.
MANDATORY: knowing the NOMINAL gain of your amplifier for each band at 0.5dB (or
better 0.2dB). You may obtain the nominal gain by reading the specifications of the
manufacturer and confirming by a classic method of tuning (taking into account that
measured gain is always slightly lower than real gain),
2.
Perform a gain measurement as indicated above (1)
3.
Preset amplifier with preset Tune and Load values,
4.
Tune at reduced power (Tune >) WITH amplifier in line,
5.
Adjust TUNE capacitor for maximum output,
6.
Adjust LOAD capacitor for the nominal Gain (i.e: 11dB),
7.
Adjust TUNE again for maximum output power
8.
Stop Tuning
9.
Repeat the same operation at full power.
The final criteria for a good adjustment is: when peaking TUNE gives you a maximum at the
recommended NOMINAL value for Gain.
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