Very true indeed. I'm thinking it may be a combination of two things. First the handhelds are clipping the PL, I have a commercial Vertex HT, and it does not do it with that, but then I have mine turned down to about 400 Hertz. I'm sure the duplexers were tuned properly, as they were done by a service shop before being shipped, they are TXRX.
Mathew > I like the idea but I'd use a parked mobile instead. HT's are hand held > and can > be moved which will change the signal level, plus they pull 3/4 to 1amp from > the batteries and can suck them down, which also changes the signal level. > The use of a parked mobile - set to the lowest power level it can do - > eliminates > both factors from the equation. > > Mike WA6ILQ > > At 06:57 PM 7/26/04, you wrote: > > >Here's one simple test. Have someone with an HT get into a noisy location, > >then disable your repeater transmitter while listening on the local speaker. > >If all of a sudden the HT becomes full quieting, you've got a desense > >problem. > > > >Chuck > >WB2EDV > > > > > > > >----- Original Message ----- > >From: "w9mwq" <[EMAIL PROTECTED]> > >To: <[email protected]> > >Sent: Monday, July 26, 2004 8:01 PM > >Subject: [Repeater-Builder] Receiver Sensitivity Testing Through Duplexer > > > > > > > I need a little advise here. I want to test my repeater's > > > sensitivity through the duplexer's while the transmitter is keyed > > > up, into my Cushman Service Monitor. What is the best method of > > > doing this? Do I need an isolator of some sort, or will the service > > > monitor handle both the incoming power and the outgoing signal > > > generator? It's a Cushman 6030 by the way. The repeater is working > > > excellent for the most part. The problem that I am having is on > > > weak signals, the audio is being chopped out, almost like the PL > > > deck is shutting down. On the bench, the receiver is at about .25 > > > microvolts sensitivity at 12 DB Sinad. Audio out of the transmitter > > > is about 4KHz wide, and clean at 100 watts. Any suggestions. > > > Handhelds are able to get in from about 4 miles away, mobiles have > > > no troubles at 30 miles away. The antenna is only up at 60' right > > > now, fed with 120' of 7/8" Andrews hardline. But it seems the > > > handhelds are the one's having the problems, and their signal is not > > > really that bad. Help please. > > > > > > Mathew > > > > > > > > > > > > > > > > > > >Yahoo! Groups Links > > > > > > > > > > > > > > > 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/
