KPA500 Hum/Buzz

[John Merrill-2]

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
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[ke9uw]

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 <[hidden email]> wrote:
>
> 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
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[John Merrill-2]

Thanks. I’ll try that.

73, John N1JM

> On Jun 2, 2019, at 6:12 PM, hawley, charles j jr <[hidden email]> 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 Merrill <[hidden email]> wrote:
>>
>> 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
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[ANDY DURBIN]

"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.

Andy, k3wyc
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html