You forgot the most important text: Microwave Spectroscopy by Townes & Shalow.
73, Dick, W1KSZ -----Original Message----- >From: allan crites <[email protected]> >Sent: May 31, 2010 8:38 PM >To: [email protected] >Subject: Re: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a >DB Products Duplexer > >Kuby, > > You might start with "Electronic and Radio Engineering" by Frederick Emmons > Terman, 4th Ed. 1955 in the Circuit Elements and Circuit Theory section. > >And try "Radio Engineering Handbook" by Keith Henny, 5th Ed. 1959 in Chapter >6, Wave Guides and Resonators by Harald Schutz. > >Also "Principals of Radar" 3rd Ed. 1952 by J. Francis Reintjes and Godfrey T. >Coate in ch.9, Resonant Lines and Cavities. > >And "Microwave Transmission Design Data" by Theodore Moreno, 1948, ch. 13 >Cavity Resonators. > >Then when you finish with these publications you will have all the answers to >all your questions and then some. > >WA9ZZU > > > >--- On Mon, 5/31/10, Kuby <[email protected]> wrote: > >> From: Kuby <[email protected]> >> Subject: [Repeater-Builder] Re: Help Needed (Guidance and advice) tuning a >> DB Products Duplexer >> To: [email protected] >> Date: Monday, May 31, 2010, 1:22 PM >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> Anyone have white papers or info on how to >> modify/design cavities? >> >> >> >> What would it take to move a window 465 can to 445/435 >> tunable? >> >> What is the design parameters for the N connector straps? >> >> What is the design of existing tunable cans (L/C >> components)? >> >> >> >> --- In [email protected], >> "Eric Lemmon" <wb6...@...> wrote: >> >> > >> >> > Not really. I had not seen this in any of my older >> catalogs, and I wondered >> >> > if in fact the unit was made by Decibel Products. >> Like many RF products, >> >> > ferrite isolators in particular, the frequency range >> stated in a >> >> > manufacturer's catalog refers to the capability to >> construct- which is not >> >> > the same as the field-tunable range of a specific >> product. I was curious if >> >> > the window filter (AKA preselector) could be useful in >> the 70 cm Amateur >> >> > band without modifying the coupling loops or jumper >> cables. >> >> > >> >> > 73, Eric Lemmon WB6FLY >> >> > >> >> > >> >> > -----Original Message----- >> >> > From: [email protected] >> >> > [mailto:[email protected]] >> On Behalf Of Jeff DePolo >> >> > Sent: Monday, May 31, 2010 6:09 AM >> >> > To: [email protected] >> >> > Subject: RE: [Repeater-Builder] Re: Help Needed >> (Guidance and advice) tuning >> >> > a DB Products Duplexer >> >> > >> >> > >> >> > >> >> > >> >> > Mine don't have labels on them. Usually they were >> sold as part of an SP >> >> > package that included the window filters, >> multicoupler, etc. >> >> > >> >> > I haven't tuned or swept this particular set, but >> from experience, the >> >> > cavity resonance will tune over a wide swath, probably >> the full 406-512 MHz, >> >> > but the loop lengths may not be optimal over such a >> wide span (depending on >> >> > how the cavities are being used), and likewise, the >> cable lengths will vary. >> >> > >> >> > You have something in particular in mind you want me >> to test? >> >> > >> >> > --- Jeff WN3A >> >> > >> >> > > -----Original Message----- >> >> > > From: [email protected] >> >> > <mailto:Repeater-Builder%40yahoogroups.com> >> >> > > [mailto:[email protected] >> >> > <mailto:Repeater-Builder%40yahoogroups.com> ] On >> Behalf Of Eric Lemmon >> >> > > Sent: Sunday, May 30, 2010 12:29 PM >> >> > > To: [email protected] >> >> > <mailto:Repeater-Builder%40yahoogroups.com> >> >> > > Subject: RE: [Repeater-Builder] Re: Help Needed >> (Guidance and >> >> > > advice) tuning a DB Products Duplexer >> >> > > >> >> > > >> >> > > >> >> > > Jeff, >> >> > > >> >> > > Can you positively identify the window filters by >> part >> >> > > number? Also, what >> >> > > is the useful frequency range of the units you >> purchased? >> >> > > >> >> > > 73, Eric Lemmon WB6FLY >> >> > > >> >> > > -----Original Message----- >> >> > > From: [email protected] >> >> > <mailto:Repeater-Builder%40yahoogroups.com> >> >> > > <mailto:Repeater-Builder%40yahoogroups.com> >> >> >> > > [mailto:[email protected] >> >> > <mailto:Repeater-Builder%40yahoogroups.com> >> >> > > <mailto:Repeater-Builder%40yahoogroups.com> >> ] On Behalf Of Jeff DePolo >> >> > > Sent: Sunday, May 30, 2010 8:39 AM >> >> > > To: [email protected] >> >> > <mailto:Repeater-Builder%40yahoogroups.com> >> >> > > <mailto:Repeater-Builder%40yahoogroups.com> >> >> >> > > Subject: RE: [Repeater-Builder] Re: Help Needed >> (Guidance and >> >> > > advice) tuning >> >> > > a DB Products Duplexer >> >> > > >> >> > > <snip> >> >> > > >> >> > > I bought two sets of those window filters from >> the same guy, >> >> > > but I knew what >> >> > > they were, caveat emptor is the golden rule at >> Dayton or any >> >> > > other hamfest. >> >> > > Actually I think I gave him $75 for the pair, and >> I took the two >> >> > > cleanest/newest ones he had (the newer dark-tan >> ones). >> >> > > >> >> > > --- Jeff WN3A >> >> > > >> >> > > <snip> >> >> > > >> >> > > >> >> > > >> >> > > >> >> > > >> >> > >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> > > >------------------------------------ > > > >Yahoo! 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