K3 loss of rx sensitivity

[John-2]

I have a K3 serial # 025** with FW REVS 4.67.
With no changes I not an apparent reduction of rx signals.
Particularly the P3 waterfall is bright enough but barely
shows traces with S5 noise level.
MSK144 reports are always weaker to me than my tx to them.
I'm at a loss as to where to start and correct this.
Any help appreciated.
Thanks.
John.


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[Don Wilhelm]

John,

If I understand you correctly, the P3 level also dropped.
That places the problem at the front end of the signal path - The T/R
switch and the ATU.

But first check the external connections.  The PL-259 connector should
be tight, and you need to check any coax jumpers that you have in the path.
What is the possibility that something has happened to your antenna -
yes, it may still transmit without obvious problems, yet receive can be
down.

With the current state of propagation, it may be that signals are just down.

Do you have a signal generator?  The Elecraft XG1, XG2 and especially
the XG3 are excellent.  They will generate a -73dBm signal - which
should show up as an S-9 signal if the preamp is on.

Do you get better reception if you connect the antenna to the RX antenna
jack?  If so, the problem is in the K3 and you should contact K3support.

73,
Don W3FPR

On 2/18/2017 5:27 PM, John wrote:

> I have a K3 serial # 025** with FW REVS 4.67.
> With no changes I not an apparent reduction of rx signals.
> Particularly the P3 waterfall is bright enough but barely
> shows traces with S5 noise level.
> MSK144 reports are always weaker to me than my tx to them.
> I'm at a loss as to where to start and correct this.
> Any help appreciated.
> Thanks.
> John.
>
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
>
> ______________________________________________________________
> 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]
>

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