[Elecraft] Consistent power output problems
AD6XY
m.j.willis at rl.ac.uk
Sat Aug 23 14:50:39 EDT 2008
I am still having problems with the output power in SSB mode.
I have updated the firmware to the latest beta but it still is not behaving
as it should. Here are my symptoms.
I set a power, any power it does not matter. I key the key to produce a tone
output and see a spike at least 20% above the set power level, but only for
the first transmission. After that the power drops back and stays correct
until I change the power. Then the process repeats.
This happens for all bands and for the transverter output. It does not
happen in CW mode. You can only see it with a peak reading power meter. It
is as if the ALC loop is reset each time you change power but only when
using SSB.
This is not a problem unless you happen to be running a linear - but then it
is potentially quite damaging. I managed to get the transverter output to
spike to full power ~3mW a while ago but significantly reduced the overshoot
that by re-calibrating the mW power gains. I know ALC overshoot is common in
some of the lesser designs like the IC706 but I had hoped the K3 would not
do this.
Am I alone experiencing this fault? Maybe there is an adjustment I can make
to lessen it?
Mike
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