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[TenTec] Model 544 frequency jumping

To: tentec@contesting.com
Subject: [TenTec] Model 544 frequency jumping
From: Douglas <sparks06524@yahoo.com>
Reply-to: tentec@contesting.com
Date: Wed, 3 Nov 2004 11:32:28 -0800 (PST)
List-post: <mailto:tentec@contesting.com>
>Message: 10
>Date: Tue, 02 Nov 2004 14:27:03 -0800
>From: "Adam N." <adam2@n4ekv.com>
>Subject: [TenTec] 544 freq display jumping on TX
>To: tentec@contesting.com
>Message-ID: <418809B7.5010901@n4ekv.com>

>I have a nice 544 that has a problem where the freq
>readout jumps around while transmitting on some bands
> (15m comes to mind).  It does not seem to be  
> changing my actual output freq.

>When I use the remote VFO (for TX and RX) the problem
>stops. I've read through the archives on this
>reflector at some possible causes 
>(PTO rebuild, dirty band switch, unstable osc) but
>I'm not sure which to attach first.

>Thanks in advance.


>Adam N.


The most likely cause is RF getting back into the rig.
I had a 544 and it did this on a reglular basis.
First try the rig into a dummy load on the bands in
If that proves the RF problem, check grounding.
Perhaps by getting a good earth ground directly to
both the rig and the power supply, you will reduce the


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