These type of duplexers are also, only good for about 5MHz split, and will not work in the ham 2M band with a 600Khz split.
Dick---N7ZH --- In [email protected], Mike Morris WA6ILQ <[EMAIL PROTECTED]> wrote: > At 10:12 AM 3/28/05, "axe1990" <[EMAIL PROTECTED]> wrote: > > >I have what I think is an old vhf mobile phone duplexer. It has four > >cavities. The cavities are marked with three as TX and one as RX. Can > >anyone tell me are these all pass type cavities ? Or could any of them > >be notch type ? This seems to be the common pattern of cavity set- up > >for these mobile phone duplexers. > > > >Thanks > > If it's the kind I'm thinking of it's a notch-only device, and > only works with lower powered TXs. There is absolutely no > pass functionality, thereby allowing any and all nearby RF > complete and free access to the RX front end. This means > that they are only practical at a repeater site unless you > are the only system there. > > The 4-cavity units come in both three-and-one and two-and-two > designs. I've also seen 6-cavity units in four-and-two and > three-and-three arrangements. > > > Mike WA6ILQ 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/
