From the length of the cans, they cannot be straight 1/4 wave resonators. That length is more like the length for UHF cans. They must be either heavily capacitively loaded or helical resonators. Either way they will not be suitable for narrow split. The specs on a Q-205D standard model show a overall length of 22in and they have a 3 MHz min spacing and 65 dB attenuation.
Burt Lang VE2BMQ Laryn Lohman wrote: > > > --- In [email protected] > <mailto:Repeater-Builder%40yahoogroups.com>, Burt Lang <[EMAIL PROTECTED]> > wrote: > > > > What length are the cans? According to Sinclair's old "Duplexor > > nomenclature" from a 1973 datasheet, that the 2B indicates a 132-150 > MHz > > range. The O5 are "Engineering numbers" and the D = 3in cavity size. > > Does any of that make sense? > > > > Burt VE2BMQ>> > > The cans are 11in long and 3in square. (The 4in cavity size > originally posted wasn't correct.) The nameplate indicates it was > tuned to TX 142.770 143.085, and RX 138.750 139.005. Yes, apparently > a range of frequencies for each. > > Any ideas on tuning and specs? > > Laryn K8TVZ > >
