I assume that this duplexor is the model with rotatable loops on the
flat welded end of the cans (as opposed to an earlier model with side
loops and rounded can ends). From my experience, if the loops are too
tightly couplied, it is difficult to get the notch close to the pass.
Try reducing the coupling by rotating the loop.
Burt VE2BMQ>>>
[EMAIL PROTECTED] wrote:
> Has any in the group had any experience with tuning Sinclair duplexers
> model Q-202C? The problem we are having with them is tuning them for a
> 600 KC split, 146.775 and 146.175. We can get one side to tune up to
> 146.775 and the other only to 145.800. The specs for these duplexers
> show that they should go to a 500 KC split without any problems. The
> person tuning these has the experience and the lab equipment to the job.
> Thanks for any help in advance
> Mike
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