At 1/6/2006 01:34, you wrote:
>Bob,
>
>Sorry if I didn't get it right but now I am really confused .... and open to
>learn.
>
><Snip and paste>
> > Shielding percentage of the antenna feedline has nothing to do with duplex
> > suitability.
>
>Somewhere I am missing something.... If shielding doesn't play a part in the
>suitability factor of selecting feedlines, why do we use hardline (other
>than less loss) or double shielded jumpers for connections etc.in a duplex
>operation?
Double-shielded jumpers are needed where isolation is needed between TX &
RX (duplexer jumpers & RX/TX connections to the duplexer). From the
duplexer antenna connector onward to the antenna, the TX & RX are already
combined. What's important there is linearity. RG-214 is double-shielded,
but it's also silver plated (or supposed to be, some '214-type' cable
isn't). Hardline has a solid outer conductor with no intermittent/point
contacts to generate IMD, so it's also extremely linear.
Bob NO6B
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/
