I'll find the person that has that equipment in my club and ask about it, it
could be a while though. I don't think it's a regular meeting goer or overly
active on the air right now but I'll look in to it.
----- Original Message -----
From: "Colin McDonald" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, December 20, 2007 6:55 PM
Subject: Re: multiple radios, one antenna
>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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