I think you are seeing the attack spike of the ALC, Trevor. The LP-100
responds to very short peaks, apparently faster than the ALC in the rig
can respond. If you go to www.telepostinc.com/K2_ALC.html you can see
examples of this. There is a picture I took of CW keying and one Jack,
K8ZOA took of the response to a tone burst in SSB.
There are two things you can do. One is to back off the requested power
just a tad, and the other is to look at the value of C36 in your meter.
If it's not 330pF, then you might want to replace it. That's the filter
cap in the detector circuit. Earlier meters used 100pF as I recall. I
increased the value to slow down the response a little. You might also
want to update the firmware if you haven't recently. You can email
off-list if you need more info.
73,
Larry N8LP
Trevor Smithers wrote:
I have just installed a recently constructed KPA100 (including the latest upgrades)
and appear to have run into the erratic power control problem.
Using Tune + Display and an external LP100 meter, if I request 5w I get 5w out.
Increasing power to 11w so as to engage the pa I also get 11w out - so all seems
fine.
Switching to SSB, and speaking steadily into the mic, at a requested 5w I get
approximately 5-7w out on each band.
However increasing the power to 11w I get the following:
80m Req 11 Get 45
40m Req 11 Get 80
20m Req 11 Get 25
15m Req 11 Get 30
10m Req 11 Get 20
Reading back through the archive I see that others have encountered the same
problem but cannot see a definitive answer to the problem. Anyone have any
thoughts as to where to start looking.
73 to all
Trevor G0KTN
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