Darrel, I've not used a scope for tuning duplexers, but know it can work if use the input level settings and sig gen level output adjustment. The scope is a device that can measure amplitude.
Proper termination using things like dummy loads and other terminator would be required due to the scope having high input impedance. These terminators could be at the scope or duplexer output with a scope probe connected, but getting such connection might not be avialable. Most do not have access to such high freq scopes. I've used such in the past and there are plenty of models to choose from, but not the typical 2-way shop or Ham gear. If the scope were calibrated for level then one could do calculations to determine how well the duplexer is working. 73, ron, n9ee/r >From: jistabout <[EMAIL PROTECTED]> >Date: 2008/06/22 Sun AM 01:06:47 EDT >To: [email protected] >Subject: [Repeater-Builder] Duplexer tuning with an Oscilloscope > >Hi All, > >Just curious if anyone here has used a wide-band oscilloscope (along >with a signal source, of course) for duplexer and/or filter tuning? > >I use an older Tektronix 7904 500mhz scope along with an HP 8640B >Signal Generator and it works great. I can't really measure filter >response, but I can see amplitude changes both large and small very >well, which allows for quite precise tuning. I've tuned a couple of >pass/notch type duplexers and several notch-only units with this setup >and they all work nicely. > >Anyway, wonder if anyone else does this and general comments on the >technique. Thanks! > >- Darrell/KA7BTV > > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
