Seems to me that I recall this being discussed in a recent THE WORLD
ABOVE 50 MHZ in QST.
###
BRETT WINCHESTER KD7JN
[log in to unmask]
208-639-8386
###
-----Original Message-----
From: For blind ham radio operators
[mailto:[log in to unmask]] On Behalf Of John Miller
Sent: Wednesday, December 19, 2007 8:26 PM
To: [log in to unmask]
Subject: Re: multiple radios, one antenna
You can tet what's called a combiner though I don't know where to get
them.
A couple guys in 1 of my clubs use them often at big public service
events.
I don't know anything about them other than they work well, but they do
make such a thing.
----- Original Message -----
From: "Colin McDonald" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, December 19, 2007 6:53 PM
Subject: multiple radios, one antenna
> here is a question for the list:
> I want to have my main VHF/UHF transceiver hooked up to my single dual
> bander, while at the same time using that same dual band antenna for
> another transceiver and a scanner at the same time.
> I don't want to have to manually switch the antenna over to the
> different radios via an antenna switch.
> What i need is some sort of distribution device that will allow me to
> transmit on either of the VHF and or UHF radios, without damaging
> either the other transceiver or the scanner. And then when there is
> no rf being transmitted, to be able to have all 3 receive properly
> using the one antenna.
> My question is, is there such a device availible?
> I know about distribution amplifiers for receive, but i don't know if
> you can transmit through those, and i also need something that will
> prohibit any rf getting back into the other radios.
> I know that any receiver that is on the same band will be desensatized
> as soon as I transmit, but i am not concerned about that since if i
> were using a separate antenna, that would occur in the near field
> anyway.
> I require such a device because i can only really have one good dual
> band antenna at any height and i have several different rigs i want to
> be able to use to monitor and transmit on, as well as listen on the
> scanner.
> I know that in multi-frequency systems, such as a public safety
> organization, or even public transit, they often have multiple radios
> on the same band going at the same time for dispatch or communications
> purposes, all using the same antenna....i suspect they use some sort
> of tuned cavities to prevent desensatization...
> I need a little box that i can plug my antenna into, and plug 3 radios
> into the other side and not worry about my 50 watts of rf on VHF
> getting back into the antenna jack of the other radios and blowing out
> the front ends.
> any help is appreciated in finding a solution to my wishes.
>
> 73
> Colin, V A6BKX
>
|
