I really can't answer how important the coupling factor is because I have
never dealt with this factor before.
I assume the only down side of too much coupling is that some small amount
of RF would then be coupled to the wrong antenna and radiated in some
pattern that is not necessarily desirable. So, as I understand it (I sure
could be wrong), if I was running a 1000 watts out, with coupling at -30 db,
1 watt would be coupled to the parallel line which would then be radiated by
the wrong antenna--which, if true, certainly doesn't seem significant. I am
not sure what is a significant level (i.e., significant distortion of net
radiation pattern) in dealing with two simultanteously feed antennas, but I
would think that if it is a ratio of the transmitted power, then 1000 vs 1
watt would seem to cause very minor distortion and would seem to be
acceptable. If my reasoning is OK, then I would think spacing of feedlines
would not need be too great, even if 5-inch spaced 600 ohm was used in place
of 1.x inch spaced 450 ohm line.
Any insight would be appreciated.
73,
Greg, N6GK

"Richard Clark" wrote in message
...
On Tue, 2 Aug 2005 21:41:42 -0700, "greg knapp 5"
wrote:

Wow, then if I had 6" spacing, it would have to be 5 feet from the nearest
other feed line!

Hi Greg,

Not really, you haven't told us how important the coupling factor is
yet.

73's
Richard Clark, KB7QHC