could be a problematic volume control...might be getting very close to 
shorting out and with a strong RF field around the Pot, it could be causing 
a temporary short.
I've found the tw1 to be susseptible to RF as well in certain 
instances...not sure if it is just in the audio circuits, but i've not 
noticed it giving inaccurate readings even when exhibiting signs of RFI.
73
Colin, V A6BKX
----- Original Message ----- 
From: "tom behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, September 30, 2009 8:45 PM
Subject: RF grounding continued


> Hi, all.
>
> I want to thank everyone who has responded to my question about RF 
> grounding
> in my new home QTH here in Colorado.  Please keep those thoughts coming.
>
> On a related note, has anyone experienced what I am experienceing with my
> TW1 talking watt meter?  Specifically, I find that when I take SWR and 
> power
> readings using 100 watts with my TS480, the volume control becomes quite
> flaky, especially at lower levels.  I don't have this problem when no real
> power is applied to the meter.  This leads me to think that I may be 
> getting
> some RF coming back into the watt meter when I use 100 watts.
>
> Thanks for any thoughts or observations you can give here too.
>
> 73 from Tom Behler:  KB8TYJ