As far as what has changed....the new piece of equipment(repeater) is by the specs more then twice as sensitive but on the bench it tested more like 3 times as sensitive as the old repeater. We are going up today to try some more testing and I will get back to this thread with the results.
>Brian wrote: >> Our local club has been running a 10 Yausu 2410 2 meter >> repeater for many years. It is run through a Wacom wp-641 4 can >> duplexer. Great results from this unit and it hears excellent....We >> recently aquired a new vertex vxr-7000 do to some really nice friends >> locally. In hooking up the new machine we have terrible desense on >> lower signals that would still be full quieting into our old machine. > >First off, just in case of a common mistake: If you replaced the cables >going to the duplexer and didn't replace them with good quality >double-shielded cable... stop and go do that right now. > >How much isolation is the Wacom providing, since you just had it tuned. > Did the shop give you a report for what they really got out of it? > >Does the repeater desense into a dummy load, or only if the antenna is >attached? > >Do you have a directional coupler and/or Iso-T that you can inject a >weak signal into the repeater with in both scenarios so you can see if >the antenna or feedline are part of the problem? > >Back to a previous thread - do you have an Isolator on it? Are there >other high power transmitters near you that could be getting into your >transmitter? What's the site like? > >Do you have any way to see if the transmitter is clean at your selected >power output level both into the antenna system and into a dummy load? > >> We had a local shop retune the duplexer and still no luck. We have >> tried it both with and without the contorller hooked up and no luck. >> It hears and transmits great in base mode but falls apart in repeat. > >I wouldn't have suspected the tuned cavity first - unless you dropped it >and dented it or something. Cavity size and frequency are physical >properties that don't really change much. > >Something else is more likely to have changed. > >Nate WY0X > > > > > > >Yahoo! Groups Links > > > > -- [EMAIL PROTECTED] Amateur Radio Callsign: KC0DWX WARN (Weather Amateur Radio Network) member 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/