Hi All, If you have a tracking generator and can check the notch skirts to see if that will give enough isolation between freqs on the notch cans, You could use the 2 or 3 notch cans on the TX side to notch the RX freq, then use the 2 or so pass cans on the RX side.
Hope this helps and good luck, Mike KB5FLX ----- Original Message ----- From: kd4wov To: [email protected] Sent: Saturday, January 23, 2010 5:38 PM Subject: [Repeater-Builder] Building a notch duplexer with notch cans. Hello All, I am building a duplexer for use on 150.125 tx and 150.625 rx. this ia for a mars machine. Yes i know this is a tough squeeze but this is what got allocated to us for now. i currently have 9 notch cans and 4 pass cans available. the machine originally had 4 pass cans and a split of over 4 Mhz. When i measured the system it has about 30db rejection with 4 pass cans. I think it would be best to set the pass cans aside and go with notch cans, i could be wrong. I have come to the point where we are getting things ready to build. As far as i can tell playing with the cans using oddball length cables (i know it will not be accurate, but it was a test) i need at least 3 notches on each side to make it work at an acceptable level. my 2 questions is : 1) what should be my cable lengths between cans. 2) what should my cable length between the cans and the antenna tee?
