This is a new build of a rev A K2 (installed rev B mods), rework eliminators,
no options installed, several other mods installed including the CW waveform
keying mod (VALC circuit). Receiver is working well.
If I set the output power to 5 watts, the usually K2 reports the power as
4.2 watts or
Bob,
The spikes you are seeing in the ALC circuit are normal, and are not
associated with any problem you may be having.
Is the variation in power observed when you press the TUNE button? If
so, that is normal too. The level is not controlled as tightly in TUNE
as it is with normal keying
Bob,
One thing that I failed to add, and might be a concern to you at first.
It is normal for the K2 to take 2 to 3 dit times to come up to the full
requested power after a change in the power knob setting, a change in
bands or a power on.
73,
Don W3FPR
On 2/10/2011 4:00 PM, n7zf wrote:
Don,
Thank you for your suggestions. It sure is hard to debug circuits that have
feedback loops.
I was using the TUNE button for the readings that I reported, and the radio
was connected to a 50-ohm resistive dummy load. I did not know that the
TUNE was an approximate power level.
The keying
Bob,
I would not be concerned about the slightly higher current draw. Change
CAL CUR to 3.50 and you should have no problems. If you add the KPA100
you will need to increase the setting to 3.50 amps anyway, so do it
now. Despite the manual recommendations, many current K2s require more
Okay, Don. I will continue then with installing the options.
73,
Bob - N7ZF
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