Havent opened on of the dB cans, but if it is like these sinclairs I have, Replace the ground lug on the coupling loop with a Johansen cap.
For VHF you will need the 1-20 caps or 1-30pF. For 220 and UHF use the 2-10pF. This has to do with the split, for me it is about 8pF for the notch to appear on the high side and 16pF for the other on VHF. Remove the opposite loop and replace with a metal plate or a hole plug. Johansens can be obtained from RF Parts, Surplus Sales of Nebraska or Ebay. Just be sure the cap you get will fit, I just got a whole bunch of Russian Johansen clones that are about triple the volume, but won't fit in the can. On Sun, Jan 3, 2010 at 12:43 PM, NORM KNAPP <[email protected]> wrote: > Hi fellas, > I need some input... > I have 11, yes 11 DB products Bp cans from various combiners. They are 8" in > diameter and have the model #SP8145-VT1 or SP8145-VT2 on some of them. I want > to "turn" them into BpBr cans in order to make duplexers out of them. I think > I will need some of those little variable caps or is there another way? Where > does one get those caps? I think they are made by johanson or something like > that. > Has anyone ever tried this? > Thanks!!! > 73 de N5NPO > Norm > > > ------------------------------------ > > > > Yahoo! Groups Links > > > >
