As long as the fence is pointed in the right direction. :-)
www.w0btu.com/Beverage_antennas.html#Misc_Beverage_antenna_notes
On this page, there are some links to ZL3IX (?) experiences with his
Beverages mounted at different heights above metal fences.
73, Mike
www.w0btu.com
On Sat, Aug 24, 2019, 12:47 PM Chuck Dietz <w5prchuck@gmail.com> wrote:
> And, by the way, K5GN and W5KU report that their Beverage above a barbed
> wire fence is the BEST Beverage at their place.
>
> Chuck W5PR
>
> On Sat, Aug 24, 2019 at 12:41 PM Chuck Dietz <w5prchuck@gmail.com> wrote:
>
>> I seem to remember someone saying the modelling programs are unreliable
>> when a wire is close to the ground. Also, there is really no way to model
>> the properties of "ground." It can vary in just a few feet and the moisture
>> content varies from day to day. I think this is a "try it" kind of antenna.
>> Read other's reported results.
>>
>> Chuck W5PR
>>
>> On Sat, Aug 24, 2019 at 12:29 PM Mike Waters <mikewate@gmail.com> wrote:
>>
>>> The only way to predict the RDF and pattern is by modeling it. I don't
>>> know
>>> of anyone who has done this. I have a few of my .ez Beverage models in
>>> w0btu.com/files/ as a starting point, but I don't think that I uploaded
>>> everything there.
>>>
>>> There are free antenna modeling programs out there. I have only ever used
>>> EZNEC. Maybe someone can suggest something.
>>>
>>> 73, Mike
>>> www.w0btu.com
>>>
>>> On Sat, Aug 24, 2019, 12:05 PM Mikek <amdx@knology.net> wrote:
>>>
>>> > > But what did you mean by "proper pattern"?
>>> >
>>> > I should have said, the best pattern that adjusting the Inductive loads
>>> > will provide.
>>> >
>>> > Yes, I understand the pattern changes with frequency. What I want to
>>> do is
>>> > inductively load the antenna, so it will have the same pattern as if we
>>> > increased the length.
>>> >
>>> > Say I have a BOG with a length that is ideal to give me the best RDF
>>> > number available at say 1.8Mhz.
>>> > Now, I move down to 1MHz, and I inductively load it, can I get that
>>> same
>>> > RDF number?
>>> > ie. can I reduce the VF to make it act like the correct length?
>>> > What are the caveats?
>>> >
>>> > Thanks, Mikek
>>> >
>>> _________________
>>> Searchable Archives: http://www.contesting.com/_topband - Topband
>>> Reflector
>>>
>>
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
|