From the Ten-Tec Reflector October 25, 2005. Posted by Ed K9EW:
For anyone using a Ten Tec rig that has PTO tuning, here's good news… I was
rebuilding the PTO in my Argosy 525, and decided to try grounding the
tuning shaft to eliminate the sometimes irritating frequency change that
occurs as you bring your fingers near the tuning knob on the older TenTec
rigs. This might be more a CW issue, but perhaps it shows up in digital
operation also.
I wanted some kind of a springy wiper contact, and I wound up using a piece
of #22 copperweld wire. I wrapped one turn around a small drill bit to form
a loop, and mounted it under the LEFT PTO screw on the inner front panel. I
had to make a couple of bends to get the wire to lay on the larger diameter
portion of the tuning shaft, making a half-loop at the "wiper" end to ride
on the shaft. This grounding wire must clear the dial cord, but it must
also avoid interfering with the outer front panel. It's easier than it
sounds. And the best part is that it works! There is absolutely NO CHANGE
in receive frequency no matter where my fingers are.
The next time you're doing a PTO rebuild, I highly recommend making this
simple mod.
On Thu, Sep 15, 2022 at 5:34 AM Garry Nichols <garrnich@gmail.com> wrote:
> I've noticed that my Century 22 changes frequency slightly when the tuning
> knob is touched. I've just realized that this may be having my hand near
> the panel just in front of the PTO. I will have to check that aspect out.
>
> The frequency change is only slight but if I have tuned to get "just the
> right pitch" on a CW signal it is enough to alter it away from that spot.
>
> Is this normal for this rig?
>
> The PTO action works very well, so before I got it a little over a year ago
> someone must have disassembled the PTO for a refurbish. I'm wondering if
> it went back together properly.
>
> TNX ES 73,
>
> Garry WA1GWH
> near Syracuse, NY
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