[TenTec] OMNI D hand capacitance effects on tuning

[Mike Hyder -N4NT-]

Yes.  You can make little wipers from music wire (spring steel) and mount
them under the two screws on each side of the PTO shaft (behind the front
panel of the rig).  Position them so they put slight pressure upon the
shaft.  Grounding that shaft thusly will eliminate the problem.

It may be possible to do this work without removing the front panel if one
sets the rig upon its heat sink and removes the tuning knob.  The hole thus
exposed may be large enough to do the work.

73, Mike N4NT

----- Original Message -----
From: "Tony" <g3zrj at morsekey.fsnet.co.uk>
To: <tentec at contesting.com>
Cc: "Dave Lawley" <g4buo at compuserve.com>
Sent: Thursday, May 08, 2003 3:31 AM
Subject: [TenTec] OMNI D hand capacitance effects on tuning


Hi,
I've recently bought an OMNI D and was wondering if there are any mods to
reduce the hand capacitance effects on the VFO?

My thoughts were:

1) extend the tuning knob with a lightweight plastic collar.

2) somehow reduce the metal components near the knob.

1)
as the tuning shaft and its associated mechanics are so delicate I decided
that extending the tuning control would impose excessive bending on the
metal shaft.

2)
I have removed the metal skirt marked for kHz which has helped quite a bit.
I am sure this is a standard measure as the hand capacitance via that metal
disk must be the major contributor.

Any thoughts re reducing the hand capacitance still further, and indeed any
other mods to do with the tuning arrangement would be most gratefully
received.

73s Tony G 3 Z R J
_______________________________________________
TenTec mailing list
TenTec at contesting.com
http://lists.contesting.com/mailman/listinfo/tentec