Spacing should not be a problem, since you are using the 2 meter beam
vertically. 3 feet is probably plenty. Mount the 13B2 above the C4.
However, for optimum performance of the 2 meter beam, you should install a
fiberglass mast extension out the top of your steel mast for the tribander
to eliminate interference from the mast being in the same plane as the yagi
on 2. Another good alternative would be to offset mount the 13B2, but
you'll still have some interference from the mast if it's metal. Yet
another option is just mounting the yagi at the very top of the steel mast
so the mast is only "visible" to the lower elements. This isnt ideal, but
still should work well and requires no effort or extra money.
73, Tyler K3MM
LEA-MALONEY@postoffice.worldnet.att.net on 04/09/97 09:55:37 PM
To: TowerTalk@contesting.com
cc: (bcc: Tyler G Stewart/BENN/CEC)
Subject: [TowerTalk] Cushcraft 13B2 vs Force12's C-4SXL
Will be mounting a Force12 C-4SXL HF Beam and a Cushcraft 13B2 2-Meter beam
on my 50' ROHN 25G tower pretty soon. The 2-meter beam will be vertically
polarized. As the tower is bracketed against the house, the beam will be
about 20 feet above the peak of the roof (BTW, the tower installation was
engineered).
Question: How much separation should I have between the two antennas?
Clif L. Maloney (KM5HY)-ex KA5VDJ
101 Lakeshore Drive East
Spicewood, TX 78669
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
|