Re: Elecraft Digest, Vol 151, Issue 23

[Elecraft mailing list]

On 30/11/16 21:23, [hidden email] wrote:

> Message: 1
> Date: Tue, 29 Nov 2016 16:15:45 -0500
> From: Don Wilhelm <[hidden email]>
> To: Richard <[hidden email]>, [hidden email]
> Subject: Re: [Elecraft] [K3] SSB TX modulation heard in phones
>
> Richard,
>
> FR feedback will not necessarily create a distorted sound, so do not
> rule that out.
> One of the best checks to see if it is an RFI problem is to operate into
> a dummy load.  If the problem goes away, it is time for better common
> mode chokes on the antenna feedlines.
>
> 73,
> Don W3FPR

And / or, the 'phones cable near where it connects into the radio.

Ferrite chokes are not that effective at HF frequencies however, so you
will need multiple turns on the core, "figure of 8" style (like you'd
use to create a wide band "UnUn" transformer.)

73.

Dave G0WBX.

PS:    If anyone on air comments on strange audio, choke the mic lead too!

______________________________________________________________
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
Message delivered to [hidden email]