[Lowfer] Antenna mod at M P

[JJ]

Yes, Mitch.  This helps.  It gives me reason to do some more work.
My loop is an 8 footer and like I said before, is ground mounted. I have 
thought about making a 12 footer and maybe raising it 5-10 feet.  I used 
some old 9913 which has held up fairly well.  It's supported by a 10 
foot piece of 2" PVC with a wooden cross piece near the top.  The loop 
is egg shaped.  I do not have a rotor on it.  I just go out and move it 
to where I want it.  It does hold it's own but I imagine I can pick up a 
few more db by making it bigger and getting it off the ground a bit.
Now that I think of it, I have a Ham M sitting down cellar.
I'm surprised that I don't hear of more of these loops being used.

Thanks!
Jon

On 11/11/2012 12:29 PM, Mitch Powell wrote:
> Jon:
>
> Yes - I built a 7 foot dia. "octoloop" using 1/2 inch copper pipe.
> Burhans preamp.   Did some testing at mid-afternoon.
> Had a branch at about 35 feet up - and in the clear.....
> tied the rope to the top of the loop and kept increasing the height in 5 ft steps,
> while checking signal strength on a couple of NDBs, noting the signal strength and the
> background noise leel. At 35 feet - the bottom of the loop ( the preamp was at 28 then )
> Can't find the actual records now - but as I remember:
> 5 feet off the ground - readable signals for reference - and low noise level.
> 10 feet off - signal increasing - nothing significant in noise level.
> 15 feet off - increasing signal strength - and noting a little more noise in the background.
> 20 feet off - signal strength seemed to level off and noise slightly stronger.
> 25 feet off ( 28 ft ) not much improvement in signal strength - and noise levlling off.
>
> That's pretty subjective - but that's as I remember.
> Now - the 12 foot "octoloop" resulted in much stronger signals without noticeable change in
> noise level - and is mounted with the preamp at15 feet.... with a rotator driving the 2 inch
> aluminum central pipe.
>
> Right now I am using the W1VD modified active antenna - base at 15 feet - with separate ground wire to ground pipe -
> and W1VD DC coupler.  Having great luck with it - and gives me HF as well.
>
> I have been using the active to find NDBs or signals then switching to the loop
> for logging and capturing.
>
> Hope that helps.
>
> Mitch
> On 2012-11-11, at 10:43 AM, JJ wrote:
>
>> Mitch,
>> I'm curious...Did you compare the Burhan's from mounted at ground level
>> to elevated and if so what were the results?
>>
>>> Jon: I'm using the Burhans setup, with a 12 foot octoloop . Nice antenna, and
>>> very directive - up 15 feet.
>>>
>>> Thanks again all.
>>>
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