N. Texas TACO Soup

KB5YVT at aol.com KB5YVT at aol.com
Thu Feb 1 19:36:32 EST 1996

I want to set the record straight!

I heard that a person or persons from this new N. Tex group has a problem
with me using W5NN in contests.  Seems they think it's unfair for me to
operate in the advanced and extra parts of the band since I'm just a general!
 Hummm...  I suggest that you spend more time collecting cans so you can
update your Buckmaster slick!  My extra class license was issued in Oct.
1993.  The first time I used W5NN was almost two years later ( Winning 1995
2A FD) !  I'm also the
trustee of the callsign as of July 95.  So get your facts straight or ask the
one you doubt...me! Guess that's one excuse you can't use anymore when
someone licensed for 2 1/2 yrs beats you again!

Please flame your response to me!!! Now YOU can speak up!


>From Charles H. Harpole" <harpole at pegasus.cc.ucf.edu  Fri Feb  2 02:39:48 1996
From: Charles H. Harpole" <harpole at pegasus.cc.ucf.edu (Charles H. Harpole)
Date: Thu, 1 Feb 1996 21:39:48 -0500 (EST)
Subject: PRB-1, DXers, Contesters and ARES
Message-ID: <Pine.SOL.3.91.960201213522.23941R-100000 at Pegasus>

Great to see a call for the Big Gun Stations to actually use them during 
emergencies.  I have said this for years (especially when I could not get 
one other "big southern state" (was it TX?) contest club member on air 
during Mexico City earthquake).  I got on with a Spain speaker and passed 
some traffic.  Did same for several hurricanes and CA earthquake.

This is our duty.  Think about it.
73, Charlie K4VUD

>From n3rr at cais.cais.com (Bill Hider)  Fri Feb  2 03:21:15 1996
From: n3rr at cais.cais.com (Bill Hider) (Bill Hider)
Date: Thu, 1 Feb 1996 22:21:15 -0500
Subject: TopBand: Top-loading effect of yagis
Message-ID: <199602020321.WAA13793 at cais.cais.com>

At 02:15 AM 2/1/96 -0500, Walt Kornienko wrote:
>Tom, W8JI writes:
>> Put in a good ground system and shunt feed the tower. I like to use a cage to
>> minimize the Q and improve the bandwidth, and reduce the voltage across the
>> series cap. I never use an omega match, instead I adjust the tap point
>> between the shunt wires and tower for lowest SWR with only a series cap. That
>> gives maximum BW and efficiency, because the series L/C circuit formed by the
>> cap and the gamma wire has the lowest L/C ratio and the lowest loaded Q of
>> any shunt feed system.   
>Tom, I always enjoy your very helpful technical analysis and advice.
>I'd like to pose a few questions and make some comments on
>observations I've made while modelling different feed systems
>for my yagi-on-top loaded tower.
>According to a graph in ON4UN's book, a tower about 30m high,
>with a face of about 12", and topped off by a common 4 element
>20m monobander on a 36' boom has an electrical length of about
>100 degrees.  I have wondered how he derived the graphs, 
>if there is a simple function that can be calculated based
>the variables in the given problem.  
>For shunt feeding a tower he directs the reader to another graph 
>where he shows the height of tap point -vs- electrical length, 
>for three gamma wire spacings, .5m, 1.0m & 1.5m.  He also gives 
>instructions on how to emperically derive the electrical length 
>by coupling a GDO to a wire that runs from the top of the tower 
>to ground level.  
>All well and good if you do not stack antennas.  Many stack one
>or more yagis on the same tower, and many are limited to using
>that tower for 160M. Thats pretty much the case here.
>The stacking situation is further exacerbated by the fact that many 
>can not place the gamma tap point below the lowest beam in the stack.
>I found that if I used a wide spacing, about 5' from gamma wire
>to tower, I could achieve a reasonable match to 50 ohms. In my case
>42' seemed to work OK.  The lowest beam on my tower is planned to
>be at 45'. So far no problem... until I modelled a 34' boom 3' above
>the gamma tap point. This spelled disaster!  The model showed extensive
>coupling between the gamma feed and the boom. The effects on the 160m
>antenna were a distorted radiation pattern, a drastic change in 
>drive impedance & reduced gain.
>Are there any ways to minimize these interactions?
>Would the N4KG reverse feed method be a better choice for such a
>*                                                               *
>*              73 de Walt Kornienko - K2WK > W3MM  (FRC)        *
>*        K2WK at crystal.palace.net  or  K2WK at N2ERH.NJ.NOAM        *
>*                                                               *

Walt, I ran into the same problem after modelling, so I never implemented
it.  I put up an inverted "V" at the top of the tower (134 ft/40 M) and it
plays fantasticlly!!

Bill, N3RR


>From Paul Mackanos <pmackano at vortex.weather.brockport.edu>  Fri Feb  2 04:05:32 1996
From: Paul Mackanos <pmackano at vortex.weather.brockport.edu> (Paul Mackanos)
Date: Thu, 1 Feb 1996 23:05:32 -0500 (EST)
Subject: OMNI-VI Info ???
Message-ID: <Pine.3.89.9602012318.A1462-0100000 at vortex.weather.brockport.edu>

Hi, Paul here, and looking for some thoughts on the purchase of an OMNI-VI.
I work about 99% CW and 1% other modes. Looking for anyone who owns one, 
has owned one, what bells & whistles they have, performance, etc?? Please 
reply direct so as not to clutter up the net. Thanks
73 de Paul, K2DB

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