[TowerTalk] Elevated vertical

[Bob Nielsen]

I am using a AV-640 at ~14 ft without any radials.  Subjectively, the  
performance exceeds my expectations on all bands (OK, it took several  
tries to bag K7C on 20 with 500 watts).  When conditions were better,  
I was fairly successful running QRP with this antenna.  I suppose  
being < 500 feet from salt water helps a bit.

73,
Bob Nielsen, N7XY

On Oct 4, 2005, at 11:55 AM, K8RI on Tower talk wrote:

> I always resorted to "that looks about right" and it usually  
> works<:-)) at
> least for radials.  I am going to have to try a set under the Hy- 
> Gain AV-640
> which supposedly doesn't require radials when ground mounted.  
> Mine's at 32'.
> It works well on all bands except 20 where it appears to be deaf.   
> SWR is
> good, but I hear few stations and even running the legal limit few  
> hear me.
> Which is another reason for wanting to set it up so I can switch to  
> the
> antennas on the big tower.
>
> 73
>
> Roger Halstead (K8RI and ARRL 40 year Life Member)
> N833R - World's oldest Debonair CD-2
> www.rogerhalstead.com
>
>
>
>> Joe, the way I do elevated radials is to tune them slightly lower  
>> than the
>> operating frequency... This is easily done... Put up the first two  
>> and
>> drive them as a dipole and tune to the desired frequency...   Make  
>> the
>> other two the same length...
>> Remember it is not the SWR that defines resonance, it is the  
>> reactance..
>> Borrow a noise bridge or antenna analyzer to tune...
>>
>> denny
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>>
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>> with
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>>
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>>
> _______________________________________________
>
> See: http://www.mscomputer.com  for "Self Supporting Towers",  
> "Wireless Weather Stations", and lot's more.  Call Toll Free,  
> 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
>
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>