Scott, As Ron has mentioned you could use a talking meter or adjust for max noise on the pass circuits and min on the reject. But the human ear will not be near as accurate as you want and need. (especially after the years of loud music on marshall amplifiers, and the thousands of rounds discharged- hihi)
I know you may just want to learn how (like me) but you need to get some help on this one. Send it to me and I would be glad to tune it. 73 Don Kirchner W5DK From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Ron Wright Sent: Wednesday, June 25, 2008 7:47 AM To: [email protected] Subject: Re: [Repeater-Builder] tuning a Cellwave 6 cavity duplexer with out sight Scott, There are normally, not for all, 2 things that are tuned on a duplexer; notch and pass. Notch removes signal (min sig) and pass lets as much as it will thru (max). As with tuning rigs one tunes for SINAD or in FM quieting...that is tunes to get more quieting of the received signal. If you had a cavity/duplexer between a signal gen and a receiver on the output you could tune the notch adjustments for most noise, starting with quieting signal and tune the pass for least noise or quieting all the time adjusting the sig gen output as you go. Having a meter, talking meter I guess, with S-meter connection would also help. I think you get the idea; tune the notch to remove as much signal as you can and tune pass to get the most signal as you can using the speaker noise as the meter. I am sure others have better ways. 73, ron, n9ee/r >From: Scott Berry N7ZIB <[EMAIL PROTECTED] <mailto:sberry%40northlc.com> > >Date: 2008/06/25 Wed AM 08:33:56 EDT >To: Repeater Builder <[email protected] ><mailto:Repeater-Builder%40yahoogroups.com> > >Subject: [Repeater-Builder] tuning a Cellwave 6 cavity duplexer with out sight > > >Hey guys, > >I have something I’d like to throw out too you and seeif there is a way to do >this. For my repeater I’ll have a Cellwave 6 cavityduplexer and I would like >to learn how to tune it myself. I am totally blind andthey don’t make a >talking service monitor that I am aware of. How would onewith out sight tune >a duplexer. There must be some way it could be done. Evenif it means I have >to make my own monitor other wise it’ll cost me and I don’tget the >satisfaction of learning. > >Scott >N7ZIB Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
