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> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >
