[Antennas] recommendations for short low dipole

[Sam Morgan]

David J. Ring, Jr. wrote:
> This new informatin from Sam would clarify things a bit.
snip
> Sam, if you were to say:
> 
> I have a 12 foot antenna on my apartment building which is 2nd floor level 
> 48 by 27 feet flat tar and gravel roof, but it produces too much noise on 
> receive.  What I need is a way to receive.  I've got permission from the 
> landlord for a maximum height of 3 feet for an additional receive antenna. 
> The landlord says I can rotate this if need be.  The noise that I receive is 
> about S9 which makes two way contacts very difficult.
> 
> I bet people would grasp what you were speaking about.  You confused the 
> issue by the mention of the 12 foot antenna without saying where it was, and 
> why you needed an extra antenna.
> 
> Again my answer would be that the only way to get the noise down in this 
> extremely noise environment is by using a noise nuller phasing box such as 
> that which MFJ sells.
> 
ok thanks for that rewrite David. It's a much better overview of the question I 
was trying to ask.

after researching the MFJ-1025 and MFJ-1026
I found a very important sentence in their pdf's:

<quote>
Effective and proper operation occurs only if the noise (for nulling noise) or 
the desired signal (for signal enhancement) is present on both the auxiliary 
(AUX) and main antennas.
</quote>

I do not hear the interference on any other antennas I have. (they are all some 
variation on a wire antenna in the room the shack is in.

This puts me back to needing an outside antenna that will receive the noise so 
phasing can be accomplished.

I think this brings me full circle back to where I started, in thinking I needed 
some form of shortened dipole at a height of 36 inches over the rooftop which is 
at 20 foot off the ground.

2 hamsticks for 40m would be about $54.00
or perhaps
a couple of 102" stainless whips from radio shack for $42.00
either way I could use an el cheepo tv rotor
to add to the possible variations I would have available.

I like loops, but just can't seem to settle on a rotatable, vertical one with a 
36inch diameter as playing much better than the short dipole, and tuning it 
would be hell to get it to transmit. lots of high voltages and such due to the 
mismatch.

of those two dipole ideas, I think I would prefer the 40m ham sticks as they 
might could also be used for transmit thru a tuner. Plus also could be switched 
to use with the MFJ-102x

what say folks, how does this idea sound for the problem as David has helpfully 
restated it for me?

-- 
GB & 73's
KA5OAI
Sam Morgan