[TowerTalk] [Bulk] Re: TowerTalk Digest, Vol 158, Issue 20

[Grant Saviers]

Having tried a Beverage over a barb wire fence, it had poor 
performance.  A Beverage needs a significantly lower conductivity ground 
underneath to develop the signal and barb wire is not that. Now that I 
know better, I built an EZNEC model of  a 10' high 600' Beverage over 3  
barb wire strands 2', 3,'  & 4' high, each insulated every 200', and the 
model yielded an RDF of 11db at 1.8MHz.  I had 600' of not insulated 
barb wire off both ends that didn't have a noticeable effect.  That RDF 
sounds a bit too good, but shows it might work ok.  It also appears 
picking 200' sections for the model was fortuitous so perhaps the idea 
can be further optimized.  Not that it matters much for me as I sold my 
ranch last fall.

Since cows are not Beverage friendly, you might try one of the various 
phased vertical receive antennas that fit in much smaller spaces. I've 
used the DX Eng 4 sq and the DHDL and had good results.

Grant KZ1W

On 2/10/2016 13:09 PM, Wayne Kline wrote:
> Patrick
>   
>    Your beverage direction  N / S   E / W are not the best direction for DX    and I am not sure about the
> coupling from  the strands of barber wire below it ? ( I think this would be an issue )
>   As for the magnetic loop..... unless you want to null out a local ground wave Noise, even a small  Beverage
> you'll be better off...  There are allot of info on the web regarding the  Beverage Antenna,
>   
> Wayne W3EA
>   
>> To: richard at karlquist.com; towertalk at contesting.com
>> From: patrick_g at windstream.net
>> Date: Wed, 10 Feb 2016 14:56:00 -0600
>> Subject: Re: [TowerTalk] TowerTalk Digest, Vol 158, Issue 20
>>
>> Rick, I have cross fences which run E-W and N-S diving the ranch into 4
>> equal square chunks of 40 acres each.  These fences are, of course, 1/2
>> mile long.  They are 5 wire barbed wire with  T-posts roughly on 15 ft
>> centers.  I was thinking of attaching extensions to the T-posts to get
>> more elevation for the Beverage as the T-posts' tops are at about 4 1/3
>> ft above ground.  If te antenna were to pass by  a gate it would  have
>> to be elevated to at least 10 ft for a distance of 20 ft or so to allow
>> for gentle bends.
>>
>> I am in a zone listed as 30 mmhos/meter conductivity as depicted by the
>> recently discussed map and do well with a Hy-Gain Hy-Tower multi-band
>> vertical atop a metal barn with no radials, just the barn as counterpoise.
>>
>> I think maybe I need to study Beverage antennas significantly more
>> before committing much time and material to any "large scale"
>> experimentation.  If a shielded magnetic loop would do nearly as well it
>> might be a better choice for the next experiment after the two in
>> process tower projects.
>>
>> Patrick        NJ5G
>>
>>
snip..