Joel, When you fabricated the jumper cables, did you consider the length of the coupling loops that are inside each cavity? Depending upon the loops used, the jumper cable itself might need to be shortened by 10 to 12 inches, so that the overall length including the loops on each end adds up to 1/4 wavelength. When the jumpers plus the loops on each end are the correct length, the total notch depth should be fairly close to the sum of the individual cavity notches. Since that did not happen in your case, I'm betting that the jumpers need to be shortened to account for the loop lengths.
73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Joel Hall Sent: Sunday, September 07, 2008 6:20 PM To: [email protected] Subject: [Repeater-Builder] db 4060 high band Hope some of you guys that have some experince with db 4060 duplexer,the pass is fine but the notch is the problem I can see the notch at around 35db on my ifr 1600s per each can but when i combine them together about 50db is the best i can get I have new cables made 1/4 wave long , the tuning caps seem a little flakey may have had been hit with a lightning surge. I have not taken them apart yet so any thoughts? Thanks kj4si
