Thanks for all replies. I have several of the Comet diplexers with
PL-259's, one "Pro-Am" model, one Larsen, and one made by Daiwa. One
person commented on the duplex noise and I tend to get alot of this
from all of these except the Larsen, which burnt up several years
back with 60 watts of UHF running through it. A 3.3 pico capacitor
smoked, and I replaced it with two 5.6's in series and all worked OK,
but I had to run the power down a little in order to keep things from
smoking again. If you look closely the paperwork on the comets and
diamonds say "200 watts" but in the fine print, it says 200 watts SSB.
I am planning to run one line of 7/8 up a 350 foot tower, but want 2M
and 440 repeaters, with two separate antennas. I don't want to use a
dual band antenna because the fiberglass comet and diamonds seem to
disappear when hit by lightning.. I'd rather use 2 separate antennas
and one feedline, and split it once up top and once on bottom. I
plan to put the diplexer in a box atop the tower.
One person mentioned replacing the pigtails on the unit to make the
duplex noise disappear. I replaced the ones on my Daiwa unit with
some small hardline used on microwave equipment that is RG-58 sized.
The duplex noise went away. Thanks for the suggestions.
73, KC4FWC
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