I remember when the micro first came out. I thought I remembered that the isolator was in there to help with transmitter stability when a perfect load was not applied. It may have well been to preserve the relay as well. Seems that I remember something about relay problems in the early days of that radio??
73 Gary K4FMX > -----Original Message----- > From: [email protected] [mailto:Repeater- > [EMAIL PROTECTED] On Behalf Of Jeff DePolo > Sent: Sunday, July 01, 2007 10:47 PM > To: [email protected] > Subject: RE: [Repeater-Builder] Cable formula > > > Hi Steve, > > > > I don't recall ever seeing that done. What was the purpose of using an > > isolator there? > > Steve will probably reply too, but I'll give you the quick answer. UHF > Micor mobiles all came stock with an isolator in the antenna network, just > like their big brother base/repeater stations. When the radio was in Rx > mode, a relay switch the reject port on the isolator to the receiver > instead > of the load. When it was in Tx, the relay switched the reject port back > to > the load. With this arrangement, you never had full PA power going > through > the T/R relay, only reject power, so presumably they did it that way as a > means of prolonging the life of the relay contacts (just a guess). > > --- Jeff > > > > > > > Yahoo! Groups Links > > >
