Mike ,Ed and the list...
What I have been using here in my shop is a couple of cut-down safety pins.
The pins are cut to leave the circular spring "eye" and one long leg.
These are placed under the two #4 screws, as you did, with the one on the
left having the leg come off at the top, and riding on top of the shaft, so
that pressure against the shaft increases with tightening the screw.
Likewise, the RH contact is placed under the screw with the leg coming off
the bottom and riding against the bottom of the shaft, so it tightens
against the shaft when tightening the screw.
73
Phil Chambley, Sr.
VFO Stabilizers and PEP adapters for wattmeters...Check out
http://home.comcast.net/~k4dpk
----- Original Message -----
From: "Mike Hyder -N4NT-" <n4nt_m_o_hyder@charter.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Tuesday, October 25, 2005 3:56 PM
Subject: Re: [TenTec] PTO HAND CAPACITANCE EFFECT - ELIMINATED
> Two wires work even better. I've used small piano wire, AKA music wire.
> Greasing the shaft where it passes through your wipers will reduce the
> problems caused by oxidation and corrosion over the years (which would not
> damage anything except the quality of the electrical contact.
>
> 73, Mike N4NT
>
> ----- Original Message -----
> From: "k9ew - Ed" <k9ew57@gmail.com>
> To: "QRP-L" <QRP-L@mailman.qth.net>; "TenTec List"
<tentec@mailman.qth.net>;
> "TenTec Contesting" <tentec@contesting.com>
> Sent: Tuesday, October 25, 2005 12:11 AM
> Subject: [TenTec] PTO HAND CAPACITANCE EFFECT - ELIMINATED
>
>
> For anyone using an TenTec 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.
> 73,
> ed - k9ew
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