Burt, Thanks for the tip. I will give that a try when I get back to working on that project.
I will let you know how successful we were. Joe - WA7JAW --- In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: > > I had a few Sinclair LB cans (from a LB hybrid ring duplexor) some years ago that were in the 30-40MHz range. They had a "can" about 12in long by about 3 inches in diameter silver soldered to the moveable end of the resonator. Removing these with an acetylene torch raised the frequency by about 10MHz (ie 35MHz went to 45MHz) in the center of its tuning range. > > Adding such a "can" or tophat capacitor to your cans should lower their frequency by the same percentage. I also had a high band VHF can that tuned the aircraft band that had a similar can on it except that it was only 2in long. More like a cup. Removing that raised the range to 132 -150 or more. > > The diameter of the added "can" appeared to be about 2-1/2 to 3 times the diameter of the resonator. The length would be whatever was required to achieve the end result. > > Any of these tophat capacitors will lower the Q of the can but at 6m you have lots of spare leeway with 1 mHz separation. > > Burt VE2BMQ > > > >Has anyone ever converted a 66-88 MHz Tx-Rx BpBr cavity for us on 6 > >Meters? I came across 2 of these and I could get them down to 57 MHz > >but that was about it. > > > >Thanks, > >Joe - WA7JAW > > > > >
