Jeff, I received some pics that have answered my question. I note that RFI quote different part no's for the high and low pass, I guess this is so the tuning is smoother, my prototype is working ok as both high/low pass in a Allgon 5" cavity @433 megs with 1.6 meg spacing. As a matter of interest I have a 28-88-01, 900meg 3.6 spacing dup which i modded to 1297 Megs, by shortening the plungers, and changing the jumpers, this works fine at 6 Megs spacing Cheers Andy G8VLL
--- In [email protected], "Jeff DePolo" <j...@...> wrote: > > > Has anyone got the dimensions of these for a 4" cavity for > > 450 ish, they are the ones with 2 BNC sockets and a capacitor...Thanks > > > > Andy > > > > G8VLL > > I'll take one apart if nobody else responds. I have both the "ham band" > 28-66-02 duplexers (100 dB isolation, 0.6 dB loss, 5 MHz split) and also the > same thing in 450-470 MHz (28-70-02) - I don't think the loops are different > between the two, just harness cable lengths. I think I also have a > 28-70-09, which has slightly different loops which yield higher loss (1.2 > dB) but deeper notches and more mid-band rejection. > > --- Jeff WN3A >
