I find it interesting where it is stated "I have developed a loud
hum........" which would imply the hum did not exist prior to this point
of observation. That being the case, then one must ask "Ok so what has
changed, been added or removed?". If it wasn't there before and
nothing has been changed, then why is it there now? Something has
failed, connections have corroded or broken, PL-259's is not tight, coax
jumper has failed due to movement. Thus I would suggest one find the
problem and correct the problem. I see no value and no point in adding
to or re-designing a system which previously worked correctly.
Now, if something was indeed added, removed or changed, that opens up
another area for investigation. What was not done correctly to
accommodate the new configuration?
Jim, K9YC has some good points on bonding, grounding and proper use of
chokes.
73
Bob, K4TAX
On 4/5/2020 3:50 PM, Carl Yaffey wrote:
I have developed a loud hum with the KPA1500 on 17m and 15m. A slight hum on
20m. All other bands, no hum.
It’s power dependent. Loud at full power, hum reduces as power is lowered. Not
too bad at 500w.
Suggestions?
73.
Carl, K8NU.
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