Butch:

I'll try and let you know.

Tom Behler: KB8TYJ


-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Butch Bussen
Sent: Monday, November 02, 2015 12:25 AM
To: [log in to unmask]
Subject: Re: Interesting TMV71A Issue

It isn't all that hard to adjust the voltage, but again I'm use to working
on that sort of thing.  I wouldn't worry about the 30 watts on 440, the
talking watt meters aren't all that accurate.  What does voltage check when
keyed up with the talking meeter?
73
Butch
WA0VJR
Node 3148
Wallace, ks.


On Sun, 1 Nov 2015,
Tom Behler wrote:

> John and all:
>
> I took a good look at my DC power cord and its associated connections 
> for the TMV71A, and also cleaned and re-seated the fuses.
>
> After doing all that, I did some more testing, and here's what I found.
>
> I can now key the rig on high power, without things shutting off. ...
> However, on 440, with my SWR at 1 point 2 to 1, my output power is 
> only between 27 and 30 watts, while my reflected power is 0 point 4 
> watts.  To me, this does mean that the rig may not quite be seeing the 
> voltage it wants.
>
> I won't have time to do this tonight, but perhaps next week-end, I'll 
> dig out another power supply, and see what happens then.
>
> I know there is a process by which you can raise the output voltage of 
> the
> RS35 power supply, but my understanding is that it's a rather touchy 
> process, that might best be done with sighted assistance.  My RS35 is 
> a metered unit, so I can have someone sighted check its readings for 
> me, or I can do so with my Omega talking multi-meter.
>
> At any rate, I think I'm getting to the root of the problem.  My next 
> dilemma is what to do about it.
>
> Tom Behler: KB8TYJ
>
>
> -----Original Message-----
> From: For blind ham radio operators 
> [mailto:[log in to unmask]]
> On Behalf Of John Miller
> Sent: Sunday, November 01, 2015 6:58 PM
> To: [log in to unmask]
> Subject: Re: Interesting TMV71A Issue
>
> I've seen that issue with other radios, mostly while mobile if 
> transmitting on high power with the engine off. It's a low voltage 
> thing I'm guessing, in fact the mobile in our car now will do that. If 
> I have the engine on, no problem, off it will do that and I've seen 
> that from a lot of Kenwood mobiles. I'd check your power supply, power 
> supply connections, clean contacts and what not, I'd bet the radio's 
> not seeing the voltage it wants to. id' say amperage but I see mobiles 
> do that all the time wired direct to the car battery which is full 
> charged so it must be looking for that 13.8 or what ever volts and not 
> the 12 you get with the engine off. I'd bet yours is not seeing the
voltage it wants to.
>
> -----Original Message-----
> From: Tom Behler
> Sent: Sunday, November 01, 2015 6:17 PM
> To: [log in to unmask]
> Subject: Interesting TMV71A Issue
>
> 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
>
>