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RE: Is it Legal

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WA4MJF

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Jan 15, 2007
Messages
509
RE: Is it Legal

I've heard, but am not sure, that there are older Moto 800 MHz rigs
that one can get and program in a systems frequencies RX only or
activate a transmit inhibit, and scan them.
Of course, it would not have talk groups, but just scan the frequencies and
stop on active ones. I'm told that these do not transmit to affiliate.
IS THIS TRUE? If so, what are some examples that would do APCO25 and
analog.

Thanks!!
 

N9JIG

Sheriff
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WA4MJF said:
I've heard, but am not sure, that there are older Moto 800 MHz rigs
that one can get and program in a systems frequencies RX only or
activate a transmit inhibit, and scan them.
Of course, it would not have talk groups, but just scan the frequencies and
stop on active ones. I'm told that these do not transmit to affiliate.
IS THIS TRUE? If so, what are some examples that would do APCO25 and
analog.

Thanks!!
While it is possible to program some trunked radios not to auto-affiliate there may be difficulties programming them to not transmit.

In order to program them for a trunked system regardless of the transmit status you or your shop would need the System Key and other trunked system parameters that control access. It would be a lot easier and cheaper to get a scanner that handles the type of trunking you would need.
 

WA4MJF

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Jan 15, 2007
Messages
509
Well, I'm not talking about a trunking radio, Rich. I'm talking about the older conventional 800 MHz radios,
that would just scan the frequencies associated with each site. I don't
see why one would need a key just to prgram the frequencies at each site, less the control
channel, as I would imangine it would stay locked on that all the time. I would think
that you could hear the comms on each frequency, but I don't even know if a TG is all on one
frequency when it is in use or maybe it frequency hops.
Maybe someone gave me some wrong info.
 

N9JIG

Sheriff
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For conventional (non-trunked) modes you can program them for RX only. Some RSS programs have you just leave the TX freq blank, some have you enter a "B" for Blank.
 

EncryptionMan

Member
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May 16, 2008
Messages
45
I have not programed an MTX8000 in a LONG time but if I recall you can program conventional frequency's in that radio with no trouble. I looked in my stockpile of stuff I never wanted to trash :) but could not find one to try it on to confirm. Sorry.
 

wlmr

Member
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Apr 26, 2004
Messages
412
WA4MJF said:
but I don't even know if a TG is all on one
frequency when it is in use or maybe it frequency hops.
Most likely depends on the trunking system. On most the ones I'm aware of the talkgroup conversation hops from frequency to frequency.

There's a couple of settings, one a parameter that always makes any radio on the system that wants to respond to what someone else on a talkgroup said go ask for permission and get a channel assigned. With this setting you'll see a talkgroup conversation change frequencies everytime someone else new talks.

Another setting puts a wait timer on the talkgroup and keeps the frequency reserved for that talkgroup until the timer lets go. If a radio waits too long to respond to a talkgroup conversation, they again get assigned a different frequency.

In either event, if the system is rather busy you'll be getting bits of different conversations. Before scanners came along that could follow a trunked system they acted the same way. Whether you could program a radio not to transmit but receive a specific systems individual frequencies or not, you'll likely be dealing with the situation I'm describing above.

I suspect that other than as an academic exercise in whether you could program a radio to do as you describe you'll end up looking for a scanner that can follow the trunked system to save any remaining hairs on your head.
 

dsheli

Member
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Mar 11, 2006
Messages
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Location
SouthEast
Just got download labrss from somewhere on the internet, it will allow you to program in talkgroups with out a key.

David
800mhz XTS5000R on the Statewide Palmetto 800
 
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