I used to have the diamond X200, sold it when I move and wish I could afford 
another one but as I recall, there wasn't much adjustment in it. The one 
thing you might check though is where the 2 halves join, make sure, very 
sure, you got the rod out of the center of the fiberglass enough to get to 
the Phillips screw in the coupler and slid it over the shaft that sticks out 
of the other half of the antenna and tightened it down. A lot of people miss 
that coupler and just put the fiberglass halves together and it can tend to 
cause funny stuff to happen. Other than that though there really isn't much 
adjustment and mine, and the ones people in one of the clubs I belong to, 
fell right in where they should when put together as I described there and 
play great.
----- Original Message ----- 
From: "Tom Behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, May 17, 2014 1:42 PM
Subject: Question on interpreting TW2 Readings with TMV71A At Home QTH


> Hi, all.
>
>
>
> Well, I was out at the RV camp site briefly yesterday afternoon, and
> re-tested my TMV71A out there with the dual-band mobile antenna that is 
> now
> attached to the RV, and using my TW2 to take the needed readings.
>
>
>
> Now that I've learned how to do the TW2 band switching properly, I'm happy
> to report that the readings out there look good, and make perfect sense.
> SWR's on both 2 meters and 440 are no higher than 1.2 to 1, and the output
> power readings on both bands are in line with what I'd expect for the
> TMV71A.
>
>
>
> However, I still think I might have an issue with my Diamond X200A antenna
> that is mounted on the roof here at the home QTH, especially on 440.  The
> antenna is near the peak of the roof, up about 40 feet or so, and is fed 
> by
> RG9913 coax.
>
>
>
> Here are some readings I get with the TMV71A, and my TW2:
>
>
>
> 2-meters on 146.47 MHZ simplex:
>
>
>
> SWR = 1.2 to 1;  Forward Power = 41 watts;  Reflected Power = 0.6 watts.
>
>
>
> Not too bad in my opinion.
>
>
>
> 440 on our local repeater frequency of 443.900:
>
>
>
> SWR = 2.4 to 1;  Forward Power = 30 watts;  Reflected Power = 5 watts.
>
>
>
> I'd be interested in anyone's thoughts as to what these readings are 
> telling
> me.  Although not terrible, my SWR and power readings on 440 are not what
> I'd like them to be, and I suspect that the lower forward power readings 
> are
> due at least somewhat to the fact that the TMV71A may be folding back a 
> bit
> due to the 2.4 to 1 SWR.  I'm not exactly sure how to re-tune the Diamond
> X200A for 440 to allow it to perform better, and certainly don't want to 
> get
> someone to climb up on the roof with an antenna analyzer to help until I
> have a very good idea as to what adjustments need to be made.
>
>
>
> In the meantime, I guess I'm fortunate in that the only 440 repeater in 
> our
> local area is about a mile from my house, and can be hit easily with 5
> watts.
>
>
>
> Part of me just says:  "If it ain't broken, don't try to fix it.";  but 
> the
> slightly elevated SWR on 440 does concern me a bit.
>
>
>
> Tom Behler: KB8TYJ
>
>
>
>