Hmm, Reject only cans were found in Hybrid Ring duplexers. Is the manufacturer Sinclair?
On Fri, Jun 26, 2009 at 1:10 PM, tahrens301<[email protected]> wrote: > Hi Folks, > > Here's the tale: > > Got a 'free' set of cans donated to our ham repeater project. > The tags inside say it was originally in the 162 range, but had > been re-tuned to the 154 range. > > Called the new owners of the dB product duplexer line, but it was > so old that they had no info. Was a 'SP' product (special). > > Tech details: Total of 8 cans, single entry point into the cavity, > with an SO-239 showing. These had UHF 'T's that made the input & > output port. On one set of 4, there was an additional 'T', in line > which had a 15 1/2" stub (end shorted) coming out of it. > > 1st, let's see the performance of a single can. Remove the extra T > with the stub, so we have a single entry & output port. > > Plug one side into the spectrum analyzer, and the other into the tracking > generator. Dial up 147.7 on the analyzer, then tune to > center the notch. Looks like about 18 dB worth of notch. > > Now, remove the track gen, plug that lead into a sig gen at 147.10. > Great!, looks like about .4 dB loss. > > Ok, now lets do the opposite. Set the spec analyzer to 147.1 & tune > it up. Set up the sig gen @ 147.7 & UH OH, 2.5dB loss. > > Looking back with the spec & trk gen, I can see the loss on the high > side. > > Both sets of cans exhibit the same performance. > > As they are, the 147.7 notch is fine & will pass the 147.1, but > reverse will end me up with about 10-12dB of loss. > > Am I doing something wrong? > > Thanks, > > Tim W5FN > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > >
