[TenTec] OT: decoupling

[Charles Harpole]

One antenna near another.... quite worring so much and put the thing

up.  Yes, one antenna affects another in near field, but

so do metal pipes, the wiring in ur walls,

the metal fillings in ur teeth, and lots of other

things we never think about.  

RF bounces off those tall metal things and the

wires that hold them, called electric distribution

wires poles.  It is a jungle out there.  Seek perfection,

while accepting "practical military necessity"

as he sez in the Oliver Stone movie about Vietnam.

73,


Charles Harpole

k4vud at hotmail.com






> Date: Sun, 17 Aug 2008 00:16:20 -0400
> From: aa4nu at ix.netcom.com
> To: dgoliver001 at woh.rr.com; tentec at contesting.com
> Subject: Re: [TenTec] OT: Ground Radials at Tower Base
>
> Derwin,
>
> I would agree with you as to not wanting to
> reduce the gain or change the TA33's pattern.
>
> But I am afraid that removing the radials from
> the 5/8w will make it worse, not better, unless
> you find a way to decouple the two antennas.
>
> K9YC's site would be a good place to study ...
>
> Another idea, might be to go to the Cushcraft
> site and download the manual for their 10m Ringo.
>
> Another idea, not knowing the tower height details,
> and 'assuming' that the group on 28.430 is local,
> would be to make a vertical 1/2 dipole, and mount
> it well below the TA33 and offset from the tower,
> or sidemount your 5/8 WITH radials well below the
> TA33 ... as you are wanting the vertical polarized
> antenna for your local ground wave communications,
> so the height of about ground, while important, is
> not worth destroying or distorting the TA33 ...
>
> Good questions, and I hope these ideas help you.
>
> 73 de Billy, AA4NU
>
> -----Original Message-----
>>From: Derwin Goliver 
>>OK will do some ck'ing.
>>Hey whille we are on antenna's...
>>Someone know where I can find some info . I am looking to put my 5/8 wave
>>10 meter gound plane above my TA 33m Mosley. And I dont want it reduceing
>>gain as much as possable.
>>NOW I built this 5/8 wave 10 meter antenna. So I was going to remove the
>>radials. Hopeing this would help protect the beam. And then let the beam act
>>as a conterpose/ radials . Now I had heard that just less than 1/8 wave was
>>best. Between the vertical and the beam .
>>But I was looking for info. And so far am not finding any. I have only one
>>antenna tower and rent. So I have to put them on the same one. And we have a
>>local net on friday night . And a group of us met on 28.430 almost every
>>night. So I must keep the Vertical. Given time I could find this. But I may
>>get more input here.
>>
>>Thanks
>>Derwin
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec