Topband: 160 meter 1/4 vertical

[Brian Pease]

I erected a 50 ft self-supporting grounded aluminum tower last fall, 
with a triband beam as a top load.  I installed 137 radials 30m long 
(because I could!).  I first shunt fed it on 160m and it works well.  I 
added 80m shunt feed this spring and it is superb.  I modeled 40m and 
30m in NEC4.2.  It should work great shunt fed on 40m where it is ~1/2 
wave, but the 30m pattern is terrible with a high angle main lobe - just 
too tall.

On 7/3/2017 7:37 PM, Dale Putnam wrote:
> The delta loop corner fed. Which corner? Makes a huge difference, doesn't it?
>
> Make this a great day
> Dale
>
>> On Jul 3, 2017, at 5:34 PM, Cecil Acuff <chacuff at cableone.net> wrote:
>>
>> We've run balloon supported 1/4 wave and 3/8 wave wires over our buried radial field with great results for contests. The balloon is a pain with any weather or wind but loads of fun.
>>
>> Cecil
>> K5DL
>>
>>
>>> On Jul 3, 2017, at 6:00 PM, Herbert Schoenbohm <herbert.schoenbohm at gmail.com> wrote:
>>>
>>> Many have tried balloon or kite supported  5/8 wave verticals on 160 with
>>> disappointing results.  I used to have a 308 self supporting tower which i
>>> could use at night on 160 but it never ever beat a corner fed delta loop
>>> supported by the same tower.
>>>
>>>> On Mon, Jul 3, 2017 at 6:38 PM, Peter Voelpel <dj7ww at t-online.de> wrote:
>>>>
>>>> Please check the pattern on 60 and 40m where the 37m high vertical is going
>>>> to be used.
>>>> You certainly will see the high angle lobes.
>>>>
>>>> 73
>>>> Peter
>>>>
>>>> -----Original Message-----
>>>> From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Charles
>>>> Moizeau
>>>> Sent: Dienstag, 4. Juli 2017 00:10
>>>> To: Herbert Schoenbohm; TopBand List
>>>> Subject: Re: Topband: 160 meter 1/4 vertical
>>>>
>>>> The free-space pattern of current in a vertical (and also  horizontal)
>>>> antenna is crescent shaped with its maximum at the midpoint, and a minimum
>>>> at each end.  It shows nothing that could be termed an extraneous lobe.
>>>> Any
>>>> such lobes would seem to be the result of improper matching, or more
>>>> likely,
>>>> the fact that in the real world such an antenna is in an environment that
>>>> is
>>>> certainly not free space.
>>>> higher angles.
>>>>
>>>>
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