Topband: 160 meter 1/4 vertical

[Joe Giacobello, K2XX]

Hi Herb, just curious.  I presume that was essentially a full wave delta 
loop.  How was it on 169M on receive?  Compared to Beverage?  Other?

73, Joe
K2XX

> Herbert Schoenbohm <mailto:herbert.schoenbohm at gmail.com>
> Monday, July 3, 2017 7:00 PM
> 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.
>
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> Peter Voelpel <mailto:dj7ww at t-online.de>
> Monday, July 3, 2017 6:38 PM
> 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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> Charles Moizeau <mailto:w2sh at msn.com>
> Monday, July 3, 2017 6:09 PM
> 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.
>
>
> The Franklin collinear antenna is usually shown either with in-line 1/4-wave inverted coaxial segments, or for wire antennas with quarter-wave decoupling stubs hanging down from the adjacent ends of the in-line half-wave radiating sections.  For the latter, the quarter-wave decoupling  stubs can be reshaped so that they run parallel to the half-wave radiating sections, and this makes for a neater configuration.
>
>
> Years ago 73 Magazine had an article describing a 7/8 wavelength vertical mobile antenna for VHF (two meters).  The bottom section was 1/2 wave and presented a high input impedance, and I believe used a LC matching arrangement to the 50-Ohm coaxial feedline.  The top section was 3/8 wavelength and decoupled from the bottom section with just a low-value capacitor.  I seem to recall that the overall dimensions were for a length that was 5/6 wavelength, but that is only five percent less than 7/8 wavelength.  The article showed comparative field-strength readings that showed superior results for this antenna versus 1/4, 1/2and 5/8 wavelength antennas.  Clearly, size matters.
>
>
> 73,
>
>
> Charles, W2SH
>
>
>
> ________________________________
> From: Topband<topband-bounces at contesting.com>  on behalf of Herbert Schoenbohm<herbert.schoenbohm at gmail.com>
> Sent: Monday, July 3, 2017 4:46 PM
> To: Jos Mols; TopBand List
> Subject: Re: Topband: 160 meter 1/4 vertical
>
> Forget about the high impedance issues on 40 and also 80.  IMHO the best
> and easiest solution for you is to make some simple wire decoupling sleeves
> or wire cage for the higher bands and they could be current fed like 160
> meters and much less complicated to feed without extensive matching.  Also
> 1/.2 wave vertical are notorious for not working well with some obnoxious
> lobes.  The only full wave verticals that I know to work are of the
> Franklyn antenna design and require a decoupling at the 1/2 part with the
> other 1/2 wave above it.  This is said to produce some low angle gain and
> essentially double the radiated signal without the wasteful lobes at much
> higher angles.
>
> On Mon, Jul 3, 2017 at 3:53 PM, Jos Mols<jos.mols2 at gmail.com>  wrote:
>
>> Hi guys, currently working on getting a radial net worked into my garden&
>> pavement. Appr 40 radials ranging from 10 to 40+ meters.
>> I can raise vertical to appr 37 meters. main interest is 160 meters.
>> I would liketo use this vertical for 80, 60 and 40 meters. Considering
>> end-fed configuration for 80/40 so making hi impedance match. Wondering if
>>   anyone has expereince with different options to achieve the same?
>> Thanks in advance for your response.
>> Jos PA0LSB
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