[amsat-bb] Re: Best arrangemet and best distance

[OZ1MY]

Hi Nader,
Place the VHF and UHF antenna as far away from one 
another as possible on the cross boom.
That way you get the smallest problem with desensing 
when you transmit on VHF and receive full duplex on 
UHF.
Place the two other antennas in between the two large 
ones.
I use a 3 meter glass fiber cross boom this way and it works fine.
Also make sure you have mechanical balance in your 
system to avoid unnecessary torgues on the rotators.

>From a point of view of distorting the radiation pattern, 
you can place the antennas very close to one another as 
long as they do not touch one another.

Place the VHF and UHF antennas in X so that the elements 
are not parallel to the cross boom.

73 OZ1MY
Ib
----- Original Message ----- 
From: "nader omer" <st2nh at yahoo.com>
To: <amsat-bb at amsat.org>
Sent: Friday, April 20, 2007 4:44 AM
Subject: [amsat-bb] Best arrangemet and best distance


Hello all
  I would like to know what the best
   arrangement and the best  distances  between
   vhf cross yagi antenna
  uhf cross yagi antenna
   l-band helical antenna
  s-band helical antenna
  over a  one cross boom 
  73 de Nader -st2nh

       
---------------------------------
Ahhh...imagining that irresistible "new car" smell?
 Check outnew cars at Yahoo! Autos.
_______________________________________________
Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb