Hi Bob thanks for the input, You are right on two meter bening the band
mostly used by our members. 440 is not all that popular around here although
we have one . The wide split looks like it might be a answer to the problem
we have We will look into it futher. Thanks
Randy
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Sunday, April 23, 2006 4:09 PM
Subject: Re: [Repeater-Builder] Duplexer Wanted
> 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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> Yahoo! Groups Links
>
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>
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