I've blown the LPA's twice running with Ft8 at 12w, with and without
pads. They do not like 12w for extended times, period ... proceed with
caution! You can run 11w all day with no problems.
73 Dwight NS9I
On 3/29/2018 7:50 AM, hawley, charles j jr wrote:
How do we know that’s pushing it? Maybe the LPA is designed for 20 Watts and
the K3 cuts them off at 12 Watts.
Chuck Jack
KE9UW
Sent from my iPhone, cjack
On Mar 28, 2018, at 7:23 PM, "[email protected]" <[email protected]> wrote:
Instead of pushing the 12 watt PA this hard it would sure be nice (and
cleaner) to have the option of using the KPA3A for 10-12 watts output.
John KK9A
K7TV wrote:
I have been testing sustained power capabilities of wideband HF transformers
for feeding EFHW antennas. This involves running high power through HF
transformers back to back into a dummy load. When running 200W out of the
KPA500, the K3 was indicating 12W, and I think that means the 100W PA was
not operating. After a few minutes the K3 totally shut down. This had
nothing to do with the transformers under test; I get the same result when
running the KPA500 at 200W directly into the dummy load. After restart the
K3 shows no sign of problem unless the 200W endurance test is run again.
Then I increased power just a little bit so that the 100W stage kicked in. I
got 300W out of the KPA500, and now the K3 keeps going without shutting
down. I can see how 12W may be a bit much for the driver stage, but if so,
shouldn't the 100W stage kick in sooner? Also, I expected the K3/KPA500
combo to be able to produce any power level I wanted within its range. What
I see is that when the 100W stage kicks in, the output (as seen on an analog
meter) makes a big jump so that certain power levels cannot be achieved.
Thanks,
Erik K7TV
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