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" [email protected] To: [email protected] 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 [email protected]. 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