Ok. Thanks. As I'm sure everyone does, trying to do this as cheap as possible. I was hoping it would be good, but won't so I won't get it. Thanks,
Michael H. Cox michaelh...@gmail.com -----Original Message----- From: Kevin Custer <kug...@kuggie.com> Date: Mon, 04 Jan 2010 15:27:02 To: <Repeater-Builder@yahoogroups.com> Subject: Re: [Repeater-Builder] Mastr II mods and parts Michael Cox wrote: > > > Will this Duplexer work with the Mastr II repeater? > > http://cgi.ebay.com/UHF-50W-6-CAVITY-DUPLEXER-FOR-REPEATER-FREE-TUNING > <http://cgi.ebay.com/UHF-50W-6-CAVITY-DUPLEXER-FOR-REPEATER-FREE-TUNING_W0QQitemZ350300447727QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item518f88a3ef> Sure, it would work. It's a six cavity unit capable of providing enough isolation for desense free operation with a receiver of -116 dBm and a 50 watt transmitter at a 5 MHz TX to RX spacing - as long as you aren't in a crowded RF environment. Would I recommend it? - absolutely not. As I and others have mentioned, a BpBr design, (like the WP-678 I referenced in an earlier mailing) would be a much better choice. Why? You'll likely buy a 100 watt PA to go along with your recent repeater purchase, and likely some day you'll want to add a receiver preamp for hearing the real weak ones.... The duplexer must provide enough RF isolation so the receiver can hear a very weak signal, while, at the same instant, putting out several watts from the transmitter so people can hear it. Look at it this way, let's say you are listening for a pin to drop on a cushioned floor while someone is shouting into your ear. The duplexer allows you to 'tune out' the person shouting - giving you the ability to hear the pin drop. This can only happen because the transmitter and receiver are on two distinctively separate frequencies and the duplexer is optimized for those exact frequencies. There are places to save money where building a repeater is concerned. The duplexer is not one of them. This doesn't mean you can't save money - you can. The $250.00 WP-678 I spoke of in an earlier mailing was about $800 to $1000 new. I'm recommending you buy $800.00 technology not $79.00 technology. Kevin Custer
