Topband: Dogleg BOG antenna.

[ZR]

I run a 500' BOG that shows excellent directivity and sure doesnt need a 
preamp. Velocity factor is determined by the ground beneath it and since 
mine is over rock only 8-24" down it might as well be bare rock.

As Ive said on here several times when others like to claim only a specific 
length works...one size does not fit all. Neither would I put one IN the 
ground or use bare wire.

For the OP Id suggest running a pair of BOGs, one 200' N and the other 200'E 
and see how they work. Then connect together. Several possibilities exist 
including a loading coil.

Another BOG experiment I havent had time for yet is a 500' 2 wire reversible 
well out in the woods for possibly full local crud reduction.

Carl
KM1H



----- Original Message ----- 
From: "Guy Olinger K2AV" <olinger at bellsouth.net>
To: "Max Cotton" <airradio at dsl.pipex.com>
Cc: <topband at contesting.com>
Sent: Saturday, September 22, 2012 2:17 PM
Subject: Re: Topband: Dogleg BOG antenna.


> BOGs can be as short as 195 feet for 160.  They do NOT work the same
> way as beverages because the velocity factor laying against ground, or
> in it, is so low.  VF on BOGs has been measured as low as 45%, more
> often around here 55-65 percent. On longer BOGs in the desired
> direction this can cause phase on the wire to be opposite phase
> incoming at points along the wire. Depending on ground and whatever,
> longer BOGs can lose front-to-back entirely or even reverse pattern.
> Folks have had good success around here with 200 to 225 foot BOGs.
> These generally have good F/B and usually quite good local noise
> quieting.  Remember to get the BOG down next to the dirt.
>
> You may need a preamp for a BOG.
>
> 73, Guy.
>
> On Sat, Sep 22, 2012 at 10:59 AM, Max Cotton <airradio at dsl.pipex.com> 
> wrote:
>> I am going to try to place a BOG antenna in my local neighbourhood, as I 
>> don't have a 650+ foot garden I thought the most inconspicuous antenna 
>> would be a BOG, however I have to 'Dogleg' it, it has to run for 200 feet 
>> North, then 200 feet East and the remainder North again, I only have a 
>> maximum run of 700 feet. I will terminate it with a 200-470 Ohm (select 
>> test) resistor at the far end, I have to run this along a wooden fence 
>> line opposite a metal mesh fence about 10-15 feet away for the entire 
>> run, this is towards the East. The mesh fence is enclosing an industrial 
>> area with a footpath running around that enclosure. My intended BOG will 
>> be on the side of this footpath away from the metal fence. Maybe I am 
>> wasting my time, has anyone done anything like this, I do have a 
>> North/South 'Inverted L' antenna but it is not brilliant for TopBand as I 
>> can only ever hear UK and EU stations and normally not even those. I can 
>> base load the 'L' but that is not brilliant. Ground conduc
> ti
>>  vity is good as I am about a mile away from a river and 3 miles from the 
>> sea, good for HF but maybe not so good for LF bands. Maybe just adding a 
>> few more topband radials to my 'L'  may work for the moment. Ideas on 
>> this anyone? QTH is South England.
>> 73 Max
>> M0GHQ
>> _______________________________________________
>> UR RST IS ... ... ..9 QSB QSB - hw? BK
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