[TowerTalk] Re: TA-40KR

[Mark Shaum]

Bob and TT gang:

I added the TA-40KR to my TA33 in the summer of 1998.  The 20M 2:1 SWR
bandwidth was reduced about 20%, no effect on 15 and 10.  The 40M 2:1
bandwidth (at the end of 160 ft of LMR400UF) was about 80khz.  Minimum SWR
was about 1.6:1.  F/B and F/S of the tribander didn't seem affected.

The rather stiff nylon/whatever diamond guying rope provided by Mosley was a
bit difficult to work with, but managed to keep the driven element from
turning into a V-beam in 60 mph winds.

While the system seemed to work o.k, I wasn't too pleased with the bandwidth
on 40, as I shift between CW and SSB ops.  There didn't seem to be as much
front/side rejection as I had experienced with a D4 rotary dipole last year.

Eventually, I took the TA-40KR kit off and installed a D40 dipole three feet
above the TA33.  The Cushcraft/Mosey combo is working out very well.  With
the D40 at 73 ft, I can pretty much work whatever I can hear on 40.
Interaction with the tribander due to the close spacing was limited to
shifting the resonant points downward about 30khz on 20, 15 and 10.

------------------------------------------------------------
Mark Shaum K9TR
email: k9tr@cwix.com

http://home.cwix.com/~k9tr@cwix.com
Central Illinois Grid EN50ii  Zip 61721
------------------------------------------------------------
    -----Original Message-----
    From: Bob Perring <perring@texas.net>


    I would like to hear from:


    Others who have first hand experience with a TA-31, TA-32, TA-33, or
TA-36,
    when using the TA-40KR 40 meter add-on trap set to any of the above.


    Specifically,
    AA)
    What did the 40 mtr addition do to performance and bandwidth of the
original antenna ?
    BB)
    What was the 40 mtr bandwidth and performance ?
    CC)
    Any other comments, not the least of which might deal with the rather
strange geometry of the modification.


    Tnx,
    N5RP


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