[TowerTalk] 40/30 near 20-10 multiband - interaction?

[K7LXC]

In a message dated 98-03-16 19:14:33 EST, brunet@us.ibm.com writes:

<< If a TH11 or a F12 5BA were put on the same mast with a 402CD/30m dipole or
a
 F12 EF240230 would there be detrimental interaction?  We are thinking of
using
 a 15 foot mast.

Hi, Pete --

      "Detrimental interaction" comes in two forms - changes in SWR and
pattern distortion. 

     Just about all the manufacturers would like 9-10 feet separation between
antennas but I've had a 402CD within 6-7 feet of a TH11 and KT34 and what you
notice is that the closer the antennas are, the higher the SWR. The 6-7 foot
spacing worked FB. The SWR was higher but acceptable. I don't have any
comments on the effect on patterns. 
 
 >The 30m dipole would be the F12 EF130 mounted at the same height as the
402CD.
 This has been reported as working well for coverage of 40 and 30. >>

      Is this in addition to or instead of the 402CD? I wasn't sure. I don't
have any idea what would happen with the 402CD and EF130 interlaced. 

     The F12 2L 30M beam is a really nifty little antenna that I'll guarantee
you'll be happy with. 

73,  Steve  K7LXC

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