Chris Peterson wrote:
>
> I've often wondered if this is a case where one of those notch-only
> mobile duplexors might come in handy.
>
> Consider this...
>
> Connect one side of a notch-only duplexor to the remote base, with the
> antenna port connected to the remote base antenna.
>
> Tune both of the notch cavities on that side to the repeater's RX freq.
>
> Would you even need anything connected to the other side?
> Perhaps a 50 ohm resister?
OR, if you need a second notch - perhaps one for the repeater TX
(keeping it away from the remote) and another on the repeater RX
(keeping the remote base out of the repeater), tune one side to the TX
frequency, the other to the RX frequency, put a 50 ohm load on the
antenna port, the remote base on the one port (RX or TX), and the
antenna on the other port. That will give you the best of both worlds.
Some people have mentioned equipment quality as a factor. While it is,
there is also the factor that hasn't been mentioned of keeping the
remote base antenna sufficiently far away from the repeater antenna.
Given enough separation, even the worst equipment can be made to work.
Or, using simple methods like I described above to help. Really... think
about it. If the equipment works with a TX that is on the same antenna
that is 600 kHz away (assuming 2M with a standard split), there is no
reason why it shouldn't work that much or farther away (or even closer)
with an antenna that is isolated by distance from the repeater antenna.
Of course, BPBR duplexers help greatly on the repeater, too.
There is even a point at which a Spectrum repeater will work with a
remote base, although that is the same separation distance as the
repeater coverage area (while also taking into account the spurs that
may be stronger than the intended carrier). ;-> (sorry - couldn't
resist)
BTW, my case is a TH21AT remote base (with a cavity to keep the repeater
TX from overloading it) and a MASTR // repeater. No, that's a MASTR-][.
No, MASTR =. Well, you know what I mean. ;->
Actually, it's a MASTR IIe.
(but I don't know what Roman numeral an e is.)
Joe M.
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