Norm, I'm glad that you're getting that duplexer working. But, I am curious about those parallel capacitors. None of the factory-tuned Sinclair Q-202G duplexers I've seen had any capacitor in parallel with the Johanson tuning capacitors- even those made for the 2m band. The loop assemblies for the high-pass and low-pass cans are identical. Perhaps the previous owner added capacitors because the tuning caps were damaged. Or maybe the loop assemblies for a combiner were used in place of the correct BpBr loops. Are the interconnecting cables the correct length?
73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of NORM KNAPP Sent: Monday, August 10, 2009 6:35 PM To: [email protected] Subject: [Repeater-Builder] Update, Sinclair Q-202G (Frankenstein series) I talked to the guy that obtained the duplxers for our club and he confirmed my belief. Those 4 cans began life as 4 separate BpBr filters used on some offshore communications, possibly mobile telephone or phone patch. He was not certain. Anyway the high pass side worked great out of the box so to speak, but the lo pass was a booger. I had to change the parralell cap values on the tuning caps for the notches. I still don't have quite as good a notch as I have on the high pass pair, but it works well anyway. 73 de N5NPO Norm
