"greg knapp 5" wrote in message
...
Thanks Frank for running the program and for the results. They give me a
good confirmation of what Riachard Clark showed me, I need to get more
space between these feeds than I was planning on. If I had 3 feeds, I
guess I ought to have a cross arm on my wood/PVC poles coming in and
spread the feeds by about two feet to minimize the interaction down to a
miniscule amount. I really do want to feed the antennas separately. Gee,
I wonder what W6AM used to do with his 10 or 12 rhombics fed with open
wire all coming into his home...

73,

Greg, N6GK

No Problem Greg, glad to help. Just for interest I ran the program at
different spacings: at 6" the isolation is 27 dB, and at 2 ft 48 dB. Both
these measurements with 600 ohm terminations.

Balanced transmission lines radiate very little energy, but worst case
occurs at the higher frequency. For example the maximum radiated RF from a
terminated 600 ohm transmission line, at 30 MHz, is about -28 dBi.

I have seen pictures of W6AM's transmission lines, but can no longer find
them on the web. His antenna farm, as I understand, was purchased from a
commercial HF station. Interesting little article on W6AM in
http://www.mvarc.com/images/mvarcJULY05pp9.PDF

73,

Frank