At 4/23/2006 12:23, you wrote:
>Yes, standard 600 KHz split. The antennas are about 25 feet about
>horizontally and about the same level vertically. And it works very well.
>The PL on the receiver just helps to prevent the transmitter from getting
>into the receiver. But I have run it for days without any PL and without
>any problem. So the sensitivity is just as good as the receiver can be.
My guess is you have desense & don't know it. Plain ol' TX noise often
won't open the noise squelch in a RX.
In my applications, any desense greatly reduces the value of having the
portapeater in the first place as all the users are using HTs in difficult
locations, not far from the repeater but between tall buildings (downtown
Los Angeles). We've tried to get them all up onto shorter wavelength bands
(220 & 440) but there's no getting around the fact that 2 meters is still
the most popular band. Given the limited number of volunteers we get
nowdays, to some extent we have to cater to their equipment
complement. Until a few years ago some didn't even have PL so the 2 meter
repeaters had to be carrier access; this was hard on everyone, being forced
to listen to blowing squelch, weak co-channel repeater users & IMD belches
all day.
Lately we've been fortunate not only in being able to get everyone PL'ed,
but also getting everyone to program their radios for our wide-split
portapeater, which uses a single antenna, small mobile duplexer & has no
desense; the whole thing fits inside a backpack. The way we accomplished
this was to scour the internet for HT operating manuals (thanks Yaesu,
Kenwood, Icom & a little help from mods.dk), extract the info on
programming odd splits & compile it into a single page "cheat sheet" that
we handed out at the planning meeting. This year I had to provide some
personal assistance with a few folks, but we got every dog gone radio
programmed.
Getting back on topic, if your portapeater user base is 50 watt mobiles,
then I guess desense isn't much of a concern for you.
Bob NO6B
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