Actually, don't EVER use LMR-400 for a duplex operation. There is some
interaction between the braid and the foil shield that causes noise and
harmonics in a duplex operation. Actually, it always does it, but in a
simplex operation, it doesn't cause a problem. The RG-214 has a double
braid and does not have the silver/aluminum interaction and is a good
choice.
[Steve Katz] ::Hi Dino...your observations about LMR-400 are interesting,
but I've never had this problem myself, and I've used LMR-400UF at repeater
sites all over the place, full duplex (single antenna) systems at 100W TX
power and extremely sensitive receivers. Possibly this is a problem that
occurs over time, but in a couple of years I haven't seen it. My local 2m
machine runs 50W output, 600 kHz spacing, can hear a pin drop 75 miles away
and uses LMR-400UF. I wonder if the problem you describe is due to improper
connector installations, which of course are rampant with this stuff... -73
de Steve WB2WIK/6
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Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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