Tom,
do you have, and have you tried a dummy load? particularly a well shielded
load. It sounds like R.F. getting into the rig where it don't belong.

good luck
tom Fowle WA6IVG

On Sun, Nov 01, 2015 at 06:17:59PM -0500, Tom Behler wrote:
> Hi, everyone.
> 
>  
> 
> Well, last night, I got rid of the gremlin that was causing issues with my
> ability to play selected audio files using Winamp, but now, another gremlin
> has appeared in my shack.
> 
>  
> 
> This time, I'm experiencing a very strange problem with my Kenwood TMV71A.
> 
>  
> 
> The problem occurs mainly when trying to transmit with high power on 440,
> but it happens occasionally when trying to do so on 2 meters as well.
> Basically, when I transmit with high power, especially on 440, the rig shuts
> off for a split second, but then comes back on.  It's almost as if the rig
> is not happy transmitting on high power for some reason, again, especially
> on 440.
> 
>  
> 
> I discovered this issue late this afternoon, as I was doing my usual monthly
> tests of equipment, antennas, etc., at least as best as I can from here in
> the shack at the home QTH.
> 
>  
> 
> In trying to diagnose the problem, I have done the following things so far:
> 
>  
> 
> 1.  My first thought was that something has gone wrong with my outdoor
> Diamond X200 VHF/UHF antenna, which is fed with RG9913 coax and is on the
> roof of my house at a height of approximately 35 feet.  I took SWR, as well
> as forward and reflected power readings using my TW2.  Both on 2 meters and
> 440, adjusting the meter for each gand as I went.  my SWR's on each gand are
> between 1.2 to 1 and 1.3 to 1.  On medium power, my forward power on each
> band is between 9 and 10 watts, and my reflected power is either at 0 watts
> on 2 meters, or point 2 watts on 440.
> 
>  
> 
> 2.  I then tried switching jumpers between my TW2, and the Diamond X200
> connection on my MFJ window feed through panel.  Again, no change.
> Admittedly, I haven't swapped all jumpers out, but at least the initial
> jumper swap didn't change the results.
> 
>  
> 
> 3.  I then did a V F O re-set on the TMV71A, with again, no change in my
> results.  I'm a bit reluctant to do the full re-set, but may do so as a last
> resort, since I have the TMV71A programming cable, and also have all
> memories and menu settings saved in a data file for the rig.
> 
>  
> 
> One other thing I might try is to see if this happens with the TMV71A that I
> typically use when camping out at the RV.  It is here in my shack in a box
> for the winter.
> 
>  
> 
> Before I go too crazy with all this, though, I'd like to know whether anyone
> else has experienced this issue, and if there are other ideas out there that
> I might want to try.
> 
>  
> 
> Thanks as always for the help.
> 
>  
> 
> Tom Behler: KB8TYJ
> 
>