Well when i first put my uhf repeater on the air,My two antennas were only 25-30 feet apart same hight and i had no problems at all.I got some motorola duplexers and added that on the repeater and hey still works great.My repeater is a vertex vx-7000 uhf repeater and i useing motorola duplexers 19 inch rackmount.
My friend put up a two meter vhf repeater and we use split site for receive and tx and works out really great.This is my first time getting into repeaters as i have been a ham sence 1985.I have found that commercial folks like to sale used gear for a new price same as some of the hams at some of the hamfest and swap meets i go to. Yep motorola is good but not that good to pay $500-650 for used duplexers and new price is like getting gas for your car.they like them better than i do and will even pay....Just my dime....Bobby/N2BR --- In [email protected], "Randy" <[EMAIL PROTECTED]> wrote: > > 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 > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
