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11.2 Operating
You should need to take only a few precautions when using the amplifier, thanks its
high level of automation.
ALC and CAT links are highly recommended to be used.
If ALC is not used, SPE reminds you that it is better to lose a fraction of dB in
transmitted power, by slightly reducing the driving power, than to over drive the amplifier
and have a poor quality transmission.
During transmission always glance periodically at the parameters on the display. SPE
has selected, designed and adjusted them with care for your use in monitoring your
amplifier.
SPE recommends, when using the ALC link, that the transceiver be set to its maximum
output power as the ALC will automatically reduce the driving power to the optimum
driving level.
To reduce the linear output, if required, just switch the amplifier to “MID” or “LOW” with
the [POWER] key.
Of course you may also continuously regulate the amplifier’s output power by changing
the level of drive power from your transceiver , even with the ALC connected.
If an output power less than 1 KW or 500 Watts is desired, for best efficiency begin
reducing drive from the “MID” or “LOW” power state. It is not recommended to reduce
the drive while in MAX or MID to an output that is close to the next lower power.
Setting Driving Levels
a) SSB : Regulate the “MIC GAIN” of the transceiver until, speaking normally into the
microphone, the signal peaks on the display don't quite reach the maximum
rated output power. Monitoring the transmission is a good way of checking
your settings. If there is however some distortion, decrease the “mike gain”
or decrease the power of the transceiver until a small reduction of the
output power of the amplifier is seen.
b) CW: In key down, you get the maximum output power automatically.
c) RTTY: Digital modes, SSTV and FM, because all these mode have a very heavy
duty cycle, you should not operate in “MAX”. It is best to use the “MID” or
“LOW” power settings.
The sophisticated software ensures this operation.
d) AM: This transmission mode radiates a continuous carrier which is 25% of its
PEP value (e.g. 400W PEP AM = 100W carrier power). SPE recommends
you always operate in ‘MID’ or “LOW” mode for AM.
To get an output signal without distortion, proceed as follows:
Transmit an AM carrier only. Then with your transceiver’s “MIC GAIN” set
to zero, advance the transceiver drive and do no t exceed 25% of the
maximum carrier output from the amplifier.
Then, speak into the microphone normally, setting the” MIC GAIN” of the
transceiver until the peak output power, on speech peaks, is shown on the
amplifier display to be no more than 0.8 KW or 400W. SPE suggests you
monitor your transmission closely to check that the “MIC GAIN” setting is
correct.
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