Thanks Eric. No problem as I have the necessary equipment (SA with tracking gen, etc). Now to find my 3 dB pads... <g>
Ken At 06:32 PM 4/9/2006 -0700, you wrote: >Ken, > >I think the "stock answer" is the one to follow. Actually, since the >bandpass tuning on a typical BpBr duplexer is rather broad, while the notch >tuning is very sharp, better results might be achieved by tuning the center >(bandpass) rod so that the notch is where you want it, rather than looking >for minimum attenuation of the pass frequency. Moreover, the pass-to-notch >spacing does not always remain constant as the cavity rod is tuned. > >I'm so used to using a network analyzer to tune a duplexer, that it wouldn't >occur to me to tune only half of the functions. There's real satisfaction >in getting a duplexer exactly on the money. I guess I don't understand why >the question was asked. With the right equipment, a complete duplexer >tuning only takes a few minutes, so there's no great amount of time to be >saved by skipping part of the procedure. > >I've tuned quite a few Sinclair Q-201 and Q-202 duplexers, and I find it >useful to tune each cavity separately before hooking them together. Very >seldom is any tweaking needed. As always, YMMV! > >73, Eric Lemmon WB6FLY > > >-----Original Message----- >From: [email protected] >[mailto:[EMAIL PROTECTED] On Behalf Of Ken Arck >Sent: Sunday, April 09, 2006 4:30 PM >To: [email protected] >Subject: [Norton AntiSpam] [Repeater-Builder] Sinclair Q-201G duplexer > >Hi folks > >I know the "stock" answer, but I'm looking for the non-stock one :-) (and >yes, I've read the manual!). > >But I was wondering (and checking my rationale here)..... in many Bp/Br >cavities, the notch tuning actually tunes to a certain freq above or below >the pass-tuned frequency. Therefore, if moving the duplexer a meg or two >but you maintain the same offset spacing, can you simply get away with >retuning the pass freq and, all other things being equal (port impedance, >etc), is that all that is needed? > >Manuals always seem to talk about tuning but rarely (if ever) REtuning... > >Ken >---------------------------------------------------------------------------- >-- >President and CTO - Arcom Communications >Makers of the world famous RC210 Repeater Controller and accessories. >http://www.ah6le.net/arcom/index.html >Authorized Dealers for Kenwood and Telewave and >we offer complete repeater packages! >AH6LE/R - IRLP Node 3000 >http://www.irlp.net > > > > > >Yahoo! Groups Links > > > > > > > > > > > > > > >Yahoo! Groups Links > > > > > > > > > ------------------------------------------------------------------------------ President and CTO - Arcom Communications Makers of the world famous RC210 Repeater Controller and accessories. http://www.ah6le.net/arcom/index.html Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net 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/
