> Can someone please explain what the difference is between a
> BandPass/BandReject duplexer and a BandPass/Notch duplexer?
In our little two-way radio world, the answer is that there is no
difference.
Technically speaking, a "notch" is very narrow, targeting only a specific
frequency. A theoretical definition of a notch might include the phrase
"infinitesimally narrow", but that doesn't exist in the real world - you
can't achive an infinite Q.
Likewise, as is often seen in other RF endeavors, a "band reject" implies a
wider reject response, not just a single targeted frequency. For example, a
band reject filter used in the TV/CATV world might reject a whole 6 MHz wide
channel, or several contiguous channels.
But the bottom line is that, in two-way, manufacturers seem to use the two
terms interchangably. So don't lose any sleep over it.
> Also - I just put a new PA online today on my 444.550
> machine. The duplexer I have is rated at 100W, and the PA is
> putting about 150W into it -- I was running about 50W with
> the old PA. (BTW - There is an isolator between the duplexer
> and the PA.) Will this cause me any grief either now or down
> the road and if so, in what way??
Quite possibly, yes. Duplexers' maximum power rating is usually a function
of one of two factors: either its ability (or lack thereof) to dissipate
heat as a function of insertion loss, or the breakdown voltages of one or
more of its internal components (such as piston trimmer caps or thin
dielectric materials).
--- Jeff
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/
