The commercial diplexer might only have to deal with
two transmit or receive frequencies feeding one
antenna. As such wouldn't the bandwidth on each port
be relatively narrow?
For use with two repeaters, the VHF port would need to
pass both the TX and RX freqs at 600 kHz or 1 MHz
separation, and the UHF port would need to pass two
freqs 5 MHz apart. I would think that this kind of
bandwidth on each port would be rather difficult for a
diplexer, as now you're actually talking about four
freqs through the feedline/antenna.
Perhaps this is why TXRX said they couldn't or
wouldn't provide something.
Or am I all wrong about the bandwidth issue? I'm
looking at it from a duplexer point-of-view.
Bob M.
======
--- Doug Bade <[EMAIL PROTECTED]> wrote:
> Kevin;
>
> Their perspective is the commercial world
> and dual band
> single antenna repeater systems do not really exist
> in these bands
> using that narrow view..... split in at the bottom
> and split out at
> the top they do, but not a dual band antenna. You
> are quite correct
> that it is not an issue if the antenna is a dual
> band, but not in
> their version of the world... Never ask the factory
> those kind of
> questions.. :-) They are not very amateur centric in
> this realm.
>
> I think as I mentioned, they mis-understood
> what he needed..
>
> They also do not know that a T-pass
> combiner can be used
> cross band (VHF/UHF) also, but that is another
> discussion .... :-)
>
> TX/RX has great stuff but sometimes it is
> tough to get
> someone who thinks outside the box on the support
> staff.....although
> there are several folks there who are quite
> knowledgeable and
> normally very helpful.
>
> Doug
> KD8B
>
>
> At 09:55 AM 11/14/2005, you wrote:
> >n2len wrote:
> >
> > >Thanks for the info, I called them this morning
> they explained to me
> > >they can build a combiner using the same feedline
> feeding different
> > >antennas but not a combiner using the same
> antenna for 2 different
> > >uhf & vhf repeaters...
> > >
> >
> >I don't know why they would have told you that,
> unless they didn't know
> >that companies make multi-band antennas...
> >
> >The diplexer doesn't know (or care) how it is being
> used, and in this
> >scenario, only one diplexer is needed; at the
> bottom.
> >
> >Kevin
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