Lee, The Motorola TDE7780A Mobile Duplexer is actually an RFS/Celwave 633-6A-2N unit. You are correct, it is designed to operate in the 450-470 MHz range, with a 5 MHz split. Since the notch tuning is fixed, it cannot be tuned to operate *properly* in the 70cm Amateur band. The Celwave catalog states that it can handle 50 watts, it has a 1.4 dB insertion loss, and 75 dB isolation. It should be okay at an isolated site, but not at a site with multiple transmitters.
The TDE7780A duplexer is not discontinued. In fact, it is the specified duplexer to fit inside GR1225, RKR1225, and similar compact UHF repeaters in the Motorola product line. Tuning instructions can be found here: <http://www.repeater-builder.com/rbtip/notchduptuning.html> 73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Lee Jones Sent: Tuesday, December 27, 2005 11:07 PM To: [email protected] Subject: [Repeater-Builder] for trade celwave notch duplexer Hey all I have a celwat rfs uhf notch mobile duplexer. cat no TDE7780A SERIAL NO 07-94-A111 I believe this is a 450-470 duplexer. I couldn't get it to work on a 440 ham band. I couldn't find any info on the duplexer i think it's discontinued. Im looking to swap out for a 440mhz one. Any takers. Lee Yahoo! Groups Links 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/
