Tom,
I'd certainly check and clean the fuse holders and connections to the
rig and at the power supply end of the cable. And perhaps has
something changed - a cable length, or some other thing that might be
allowing a bit of RF feedback? Not havint ehe gear in question I
can't be more specific.
Good luck.
K9JAUAt 05:17 PM 11/1/2015, you 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
>
>
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