Rick Et al:
The K3S makes 110 watts measured so the rigs finals appear to be just
fine. Audio is also clean with no distortion. After further testing, I
found that the power drop is only momentary.
The RF output on the KPA500 does drop when the drive on the K3S is
increased from 12 to 13 watts, but it quickly rebounds to it's normal
output a few seconds later.
This happens on all bands and only takes place during the transition
from 12 to 13 watts. I can hear a relay click during the 12 to 13 watt
increase which happens to coincide with the momentary condition
described above.
Whatever it is, something changes the way the transmitter behaves
momentarily during that specific power change and my guess is that it's
not unique to my K3S.
I spend most of my time on CW and little on SSB so I never noticed this
before. Other than that, the K3S and KPA500 work flawlessly.
Tony
On 3/4/2020 6:09 AM, Rick Bates, NK7I wrote:
Except that it only happens in SSB, it sounds suspiciously like the
high power amp (final) has failed in your K3S. But start with your
audio. Are the settings normal (comp, mic gain etc)?
Can you try another microphone and turn on the monitor function to
hear what your mic is producing? Is the two-tone function
accidentally on?
What power output can you read when not using the amp and going above
12 watts? If more than 12 watts, a calibrate output would be in order
for for your confidence.
Is it confined to one band?
If you don't get direction of the cause from these tests, a phone call
to Elecraft service is in order.
73,
Rick NK7I
On 3/3/2020 10:48 PM, Tony wrote:
All:
I've noticed an unusual thing happen with my K3S and KPA500 amplifier
while in SSB mode. When I increase the K3S drive beyond 12 watts, the
KPA500 power drops-off dramatically. This only happens in SSB mode.
The KPA500 functions fine with other transceivers as well so the
condition appears to be unique to the K3S. Any suggestions?
Tony
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