|Subject:||Re: [TowerTalk] Force 12|
|Date:||Thu, 11 Nov 2004 14:09:44 +0000|
In order to get a reasonable match, perhaps, but wouldn't being able to use one C-3 on >1 band simultaneously be a good reason to go with separate feeders? ;^)
Wish our power limit allowed a kW. ;^)
With a little extra bandpass filtering, lots of folks who can run 1.5 kW are listening on one band whilst CQing on another with a dozen or two of cm separation between driven elements.
I find the limiting factor is more wide band noise from the transmitter rather than the receiver wilting, but dealing with the former makes the latter pretty much a non-issue. Portions of my current antennas are single-digit cm away from each other & when I get around to adding stubs, I should be able to listen within a few kc of even the harmonic of one rig that falls within the other band I'm listening on with the other.
All my antennas are in roughly a 8 m^2 space. The tower supporting the
higher band antennas is even shunt fed for the low bands & is being lit up
whilst the other rig is listening on the higher bands. One of these days,
I might hang a spectrum analyzer on the feeders to see how much isolation
I start out with before the filters, but it's probably so little I'd rather not know.
I envy even second or third tier stations in other places that have the
luxury of a little space.
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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