Thanks for the tips.
I am in the process of borrowing a 220 transceiver to try an A-B
comparison to see if it is the receiver. Just seems strange the way
it dies with the shield connected.
I am reluctant to touch the duplexer as the owner just spent some
bucks having tx/rx go through them and align.
--- In [email protected], Ralph Mowery <[EMAIL PROTECTED]> wrote:
>
> --- Michael Singewald N1PLH <[EMAIL PROTECTED]>
> wrote:
> >
> >
> > OK, this is making me nuts. I have changed jumpers
> > about 3 times
> > thinking I have a cable problem but I am convinced
> > it is not the
> > cable. Here are the symptoms:
> >
> > 220 Hamtronics receiver (very old, no labeling on
> > the board). Tunes
> > great on the bench (.15uv 12db sinad). Installed
> > into rack still
> > tests great. Hookup to the duplexer and sensitivity
> > goes to crap
> > (1.5uv).
> > However, if I back the PL connector (I know, not my
> > repeater, just
> > helping) on the cable to the rx out of the T
> > connector on the
> > duplexer, the sensitivity improves dramatically. As
> > soon as the
> > ground on the connecter touches the duplexer the
> > signal dies.
> >
> > I have done this without the tx transmitting but
> > connected and
> > disconnected with no difference. My service monitor
> > is hooked up to
> > the t connector on the antenna port of the duplexer.
> >
>
> Hook a dummy load t replace the transmitter. This
> terminates the port and eliminates the poeeibility of
> transmitting. Hook the signal gen to the antenna
> port. See what the receice sensitibity is. Try this
> with a differant receiver on the receive port. Beter ,
> worse ? Try tuning the receiver while hooked to the
> duplexer and see if you get any improvement.
>
>
>
>
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