"my KPA500 seems to have an excessive amount of hum/buzz when transmitting.
What should I look for?"
Ask Elecraft support to send you the paper "KPA500 Application Note - Hum
Mitigation". Also ask about the mod kit that includes a longer transformer
hold down bolt an extras rubber disks.
Thanks. I’ll try that.
73, John N1JM
> On Jun 2, 2019, at 6:12 PM, hawley, charles j jr
> wrote:
>
> Readjust the toroid hold down? Maybe rotate it a bit. Just make a change of
> some kind...
>
> Chuck Jack
> KE9UW
>
> Sent from my iPhone, cjack
>
>> On Jun 2, 2019, at 5:59 PM, John
Readjust the toroid hold down? Maybe rotate it a bit. Just make a change of
some kind...
Chuck Jack
KE9UW
Sent from my iPhone, cjack
> On Jun 2, 2019, at 5:59 PM, John Merrill wrote:
>
> Probably has been discusses before but my KPA500 seems to have an excessive
> amount of hum/buzz when
Probably has been discusses before but my KPA500 seems to have an excessive
amount of hum/buzz when transmitting. What should I look for?
73, John N1JM
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
I run my amp on 240 VAC with the yellow tap as supplied from the
factory. No hum or buzz when operating 550 watts output. Drive on 6M
is 30 watts. SWR is 1.2:1 or better. Other bands the same. The
KAT500 memory is "trained" every 50 kHz on all band below 10M. In
fact with my ear
When I first started using my KPA500 I found the hum/buzz during high power CW
operation to be intolerable. Elecraft support sent me a paper on hum
reduction, a longer transformer bolt, and additional rubber washers. I did not
use any of this new hardware but now have acceptable hum/buzz
6 matches
Mail list logo
