> >I have not experimented with the effects of jumper length,
> since I usually ordera duplexer made for a specific repeater
> pair, and merely verify its operation
> >>What does the length of the cables between cavities affect
> >>in the duplexer system? I seem to vaguely recall it had
> >>an effect on the bandpass to band reject slope and the
> >>position of the notch (separation?) , but I'm not
> >>completely sure of this.
It does...
In some self contained duplex combiners (Cellwave as an
example), one will see two lengths of cable stubs from the
cavity probe/loop up to the duplexer harness T.
One length places the reject slope higher on the tx side
while the other length places the slope higher on the rx
side.
The proper probe/loop to harness stub length can greatly
increase a desired notch. Decibel's VHF Cavity stub length
adds over 10dB to one suck-out cavity.
So you'll find three stub lengths in use... depending on
where you want the enhanced cavity/cable operation.
cheers,
skipp
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