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
>> _______________________________________________
>>
>> 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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>>
>>
> _______________________________________________
>
> 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.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
_______________________________________________
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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