> > >If the tunable stub is connectorized, then just add a 90 degree >connector in line to make it a bit longer. > >
No connectors on the tuning stub. The coupling loop is built into the stub and it extends at a right angle from the loop insert. A single N connector opposite the tuning stub couples to the harness. I am not sure if the center conductor inside the notch tube will unscrew from the connector/loop assembly. It looks like it is soldered to the loop and connector. >It depends on the version of the old stub Q202 duplexer you have. > >Is it side mounted or top mounted loops and are there 4 or 8 pieces of >coax being used? Is the harness connectorized with separate Ts or is >it one assembly? The coax lengths should be a little longer but I >think 2" is too much if I remember correctly. You should still be >able to make it work with that cable harness. > > The harness is made up of 8 individual cables with all cables the same length except for one that couples from the junction of the antenna output cable and the receiver connection. (transmitter connection is also longer). I have tried extending the cables with an elbow connector on each of the cavities that won't tune with no change in the tuning characteristics. >A good working stub Q202 is better than a new Q202 with capacitor loops. > >Harold, VA3HF >--- In [email protected], Burt Lang <[EMAIL PROTECTED]> wrote: > > >>> >>> What you are experiencing is the symptioms of insufficient capacity to >>> pull the notch down low enough on the low pass side. The capacity >> >> >range > > >>> of those "tuning stubs" is determined by the length of the center rod >>> inside the plastic stub. They are 3/16 (I think) diameter brass rod >> >> >with > > >>> a threaded end. Sinclair had several lengths available, the longest one >>> being about 6in long. There is probably nobody left at Sinclair that >>> even remembers that part as that design dates back to the 1950s or 60s >>> and was superseded by the Johanson trimmer design in the late 1960s. >> >> >You > > >> should be able to get a local machinist to make you a longer one using >> the one you have as an example. >> >> Burt VE2BMQ>>> > Thanks for the inputs - 73 - Jim - W5ZIT Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
