--- 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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