INDEX Page. 34 of 89
11.2 Operating
You need only take a few precautions when using the amplifier, thanks its high level of
automation.
The use of both the ALC and CAT connections is highly recommended.
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.
For example, delivering only 500 Watts in MAX thinking not to stress the amplifier
one gets exactly the opposite result.
In fact in this case the MOSFET dissipates about 680 W, while in LOW delivering
the same output power would dissipate just 250.
430 W used only to raise the temperature of the MOSFET.
If the ALC link is not used, at each switching from MAX to MID or LOW, whether
automatic or not, remember to manually reduce the driving power to avoid
dangerous overdriving.
Setting Driving Levels
a) SSB: Regulate the “MIC GAIN” of the transceiver until, speaking normally into
the microphone, the signal peaks on the display and does not 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. Keep in
mind that, in some cases, if the ALC link is active, the indication of ALC
on the transceiver display may no longer be indicative.
To Next Page
Loading...
