K2 - Poor Audio Reports

[David Heinsohn]

On 160 mtrs, SSB as I move up the band I begin to get poor audio reports
at about 1.900mhz.  The tuner is showing less than a 2:1 swr at that
point and I retune often as I move up.  The antenna is a dipole centered
on 1.825mhz.  Other than adding a shorter element to the dipole, any
ideas what I need to do to fix the problem?  Any ideas why I'm getting
the poor audio reports?

Thanks,

David

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[Steve Ellington]

Logic tells me to first hook the K2 to a dummy load and listen to yourself
in another receiver. That should tell you a lot.

Steve
N4LQ
----- Original Message -----
From: "David Heinsohn" <[hidden email]>
To: "Elecraft_List" <[hidden email]>
Sent: Saturday, February 27, 2010 11:09 PM
Subject: [Elecraft] K2 - Poor Audio Reports

> On 160 mtrs, SSB as I move up the band I begin to get poor audio reports
> at about 1.900mhz.  The tuner is showing less than a 2:1 swr at that
> point and I retune often as I move up.  The antenna is a dipole centered
> on 1.825mhz.  Other than adding a shorter element to the dipole, any
> ideas what I need to do to fix the problem?  Any ideas why I'm getting
> the poor audio reports?
>
> Thanks,
>
> David
>
> ______________________________________________________________
> 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

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[Don Wilhelm-4]

David,

Since there is nothing band or frequency dependent directly associated
with the generation of SSB and the audio in a K2, my first suspect is
that you have an RF Feedback situation on 160 meters.
Does it do the same thing when connected to a dummy load?  If it is
still the same, the feedback path is internal to the K2 and we can help
further, BUT if it is OK on a dummy load, the problem is coming from
your antenna and will have to be fixed in the antenna system.
If you have not grounded the shell of your microphone connector, that
may be a good first step.  The way I do it is to remove the left side
panel and scrape a bit of the slikscreen material from the board right
at the base of the  mic jack - then apply a large tipped soldering iron
to the connector until the mic jack itself melts solder near (but not
at) the iron tip location.  Flow some solder at the junction of the mic
jack and the bared ground spot and it is done.

73,
Don W3FPR

David Heinsohn wrote:
> On 160 mtrs, SSB as I move up the band I begin to get poor audio reports
> at about 1.900mhz.  The tuner is showing less than a 2:1 swr at that
> point and I retune often as I move up.  The antenna is a dipole centered
> on 1.825mhz.  Other than adding a shorter element to the dipole, any
> ideas what I need to do to fix the problem?  Any ideas why I'm getting
> the poor audio reports?
>  
>
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