My guess from looking at the schematic is that the tee's are for the grounded and ungrounded coaxial cable tuning stubs that were cut for the original freqency and have been apparently removed. Some one else will have to fill you in on how to calculate the length, etc for making replacements.
Doug N3DAB --- In [email protected], n...@... wrote: > > At 3/29/2009 14:09, you wrote: > >Ok, so I've got a nice looking db-4030 duplexer. > >Little 6m repeater project cooking. > > > >Now, I've got the "tuning" sheet and also the scan of a fax of a > >modification sheet for 6m. > > > >I also understand it's a reject only setup. > > > >My question is, what are the unterminated "T" connectors doing all over the > >harness? > > > >Please forgive the terrible pictures, I used my cheap motorcycle MP4 camera. > > > >There are 4 "T" connectors that only have a plastic cap over the female > >part. > > > >Just seems crazy to me. > > Check out the last page of > <http://www.repeater-builder.com/db/db-4032-low-band-duplexer.pdf>. > According to the table at the lower right, 6 cables on the DB-4032 (6 can > version of the DB-4030) are omitted for splits 1 MHz or greater. Also, > unterminated T connectors @ VHF lowband are going to look pretty much like > opens, since the line length is very short. Don't know how much leakage > you'd get with SO239s; I do know that female Ns left open won't leak, > especially @ 50 MHz.. > > Check the schematic in the above referenced page & see if it matches what > you have, subtracting the 2 outside cans from the schematic. > > Bob NO6B >
