i did...nothing seems to come up for combiner, except VHF and UHF combiners
for TV and satelite systems.
nothing for two way radio except some combiners for receive only for short
wave rigs and scanners...
I searched on google with several different terms, but nothing.
It almost sounds like it either doesn't exist, can't be done easily, or
might have to be custom built by down east microwave, DCI or some other rf
products company.
maybe i haven't looked hard enough at the sinclaire repeater
products...there might be something to that.
73
Colin, V A6BKX
----- Original Message -----
From: "John Miller" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, December 20, 2007 4:47 PM
Subject: Re: multiple radios, one antenna
> I think that's where a combiner will help you out from what I'm told.
Check
> it out.
> ----- Original Message -----
> From: "Colin McDonald" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, December 20, 2007 6:37 PM
> Subject: Re: multiple radios, one antenna
>
>
> > that is what i was thinking too.
> > Except a duplexer seems to allow for use of two transmitters and
receivers
> > within the same band, but not the same band pass...in other words the
> > filters have to be set up so that each transceiver can only talk or
listen
> > on a certain band width. without the two ever crossing.
> > So for instance, i could have one transceiver on 144 to 146MHZ, and
> > another
> > transceiver on 146 to 148 MHZ, but neither radio could just go where
ever
> > it
> > wanted between 144 and 148 without having to reselect the band pass for
> > that
> > radio.
> > I guess what i am looking for mostly, is something that will trip a
switch
> > on all the ports as soon as i start transmitting on one radio.
> > This will keep the rf from going directly into the other radios while i
> > transmit.
> > And, something that has a proper distribution amplifier built in so
there
> > is
> > no signal loss with multiple receivers going off one antenna...
> > I basically need a multicuppler for the receive side, but one that can
> > except rf going back through it from the transmitter, and that will
> > instantly shut down all receiving ports while that rf is going back
> > through.
> > A multicuppler usually will receive from say 50MHZ to 2GHZ, so the
> > receive
> > is certainly wide enough.
> > A duplexer has fairly narrow filtering only a few megs wide usually.
> > anyway, i'm still searching for what i want.
> > 73
> > Colin, v a6BKX
> > ----- Original Message -----
> > From: "Steve" <[log in to unmask]>
> > To: <[log in to unmask]>
> > Sent: Thursday, December 20, 2007 8:08 AM
> > Subject: Re: multiple radios, one antenna
> >
> >
> >> A duplexer?
> >>
> >> ----- 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
> >>
> >>
> >>
> >> --
> >> No virus found in this incoming message.
> >> Checked by AVG Free Edition.
> >> Version: 7.5.503 / Virus Database: 269.17.5/1190 - Release Date:
> > 12/19/2007 7:37 PM
> >>
> >>
> >
>
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.503 / Virus Database: 269.17.5/1190 - Release Date:
12/19/2007 7:37 PM
>
>
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