Also you may wish to try building dual loop BpBr as described here http://www.repeater-builder.com/antenna/pdf/ve2azx-duplexerinfo.pdf
Takes more connectors and tees, but you don't have to modify the original cavity. On Sun, Jan 3, 2010 at 1:06 PM, DCFluX <[email protected]> wrote: > 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 >> >> >> >> >
