OK - Here are my requirements for the transmit chain. minimal physical space and minimal insertion loss :-) (ok - too bloody obvious) Tuning simplicity is also a factor. I'm combining 3 transmitters at 144.39, 145.05 +/- 0.04 and 145.25
Right now by best bet for minimal space is the hybrid coupler approach, but I pay in insertion loss. best for insertion loss is the T-Pass, but the T-Pass is starting to cut heavily into my available space --- I'm already looking at 6-9 cans on the receive side and would prefer something with NO cans on the transmit side. Despite the space issues I'm still considering the T-Pass because of the improved spurious signal suppression. Getting the cans is another issue - could I use a regular band pass can with a coax T rather than an actual T-Pass can ?? Can you list out some of the other options that I might be able to squeeze onto my trailer ?? _____ From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Jeff DePolo Sent: Monday, October 22, 2007 9:41 PM To: Repeater-Builder@yahoogroups.com Subject: RE: RE: RE: [Repeater-Builder] Re: duplexer isolation and reciever noise budget > Commercial installations usually use either a harmonic filter > and 3db hybrid coupler, or a special type of band pass cavity > to couple the output from the isolator to the feed line. > (This info from an RX TX application note on transmitter combiners) Well, that's just two out of a myriad of ways of combining, duplexing, multicoupling, etc. Hybrid-ferrite and TX-RX's T-pass are by no means the only two ways of combining transmitters.
