INDEX Page. 35 of 89
b) CW: In key down, you get the maximum output power automatically.
c) Digital modes: In MAX the amplifier is full I.C.A.S. it is able to manage all
modes currently in use.
A suitable SW automatically switches in MID for a transmission longer
than 8 minutes.
In MID and LOW the amplifier is C.C.S.
In the modes in which audio signals coming from PC are transmitted,
to bypass the possible delay action of the internal ALC of the
transceiver, we suggest:
1. Maintain the ALC link with the linear.
2. Set the linear to "MAX".
3. Set the transceiver Pout to maximum.
4. Adjust the PC audio output exclusively through PC commands
until the maximum (or less) available RF power is obtained.
Probably the most common causes of problems are overdriving the rig,
and ground loops. Avoiding ground loops is generally not too difficult if you
use isolated (galvanically or optically) inputs and outputs.
It is assumed that a fixed gain audio input is used in the transceiver.
In case of input via microphone connector, leave the "MIC GAIN" set in the
position used in SSB and adjust the audio level via PC.
The presence of the ALC connection allows to adjust the driving signal by
switching to MID and LOW without having to readjust the signal via PC.
With Flex or Elecraft transceivers, where the ALC is not usable, always
follow steps 2, 3 and 4. but you have to manually readjust the audio via
PC if you move from MAX to MID or LOW.
d) AM: This transmission mode radiates a continuous carrier which is 25% of
its PEP value (e.g. 400W PEP AM = 100W carrier power).
To get an output signal without distortion, proceed as follows:
Transmit the AM carrier with your transceiver’s “MIC GAIN” set to zero,
then increase the transceiver’s drive until the 25% of the maximum output
power you want have is reached.
Speak into the microphone normally, then set the ” MIC GAIN” of the
transceiver until the peak output power shown on the amplifier display
is no more than 800W (MID) or 400W (LOW).
SPE suggests to monitor your transmission closely to check that the
“MIC. GAIN” setting is correct.
e) FM: By monitoring your transmission you can easily get the correct emission
by adjusting the. "MIC GAIN".
To Next Page
Loading...
