Thorny41587
Member
Is it possible to only have one frequency for a trunking system? And would that work in a scanner with just one frequency? Thanks
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One Frequency Trunking
- Thread starter Thorny41587
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troymail
Silent Key
well, you'd need at least two freqs - one for the
control channel and one for communications...
but that really doesn't make allot of sense....
I guess I could see a three channel system where
two communications freqs (plus 1 control channel)
could be shared amongst numerous users - first come
first serve.
I think the fewest freqs I've seen in a trunked system
was 4 (1 CC and 3 voice channels)
control channel and one for communications...
but that really doesn't make allot of sense....
I guess I could see a three channel system where
two communications freqs (plus 1 control channel)
could be shared amongst numerous users - first come
first serve.
I think the fewest freqs I've seen in a trunked system
was 4 (1 CC and 3 voice channels)
RFGUY
Member
Yes it is!
In EDACS it is called SCAT or Single Channel Autonomous Trunking.
The Control Channel also acts as the working channel for that system.
In EDACS it is called SCAT or Single Channel Autonomous Trunking.
The Control Channel also acts as the working channel for that system.
Thorny41587
Member
But does it track it with a scanner?
jf222
Member
Yes - Uniden - 250D/785D and probably others
When you set the bank to this type of Edacs it mutes the data and allows you to hear only the voice. this is a ONE frequency system that only allows one user (company) to be active at a time. Other users (companies) do not hear the transmissions.
When you set the bank to this type of Edacs it mutes the data and allows you to hear only the voice. this is a ONE frequency system that only allows one user (company) to be active at a time. Other users (companies) do not hear the transmissions.
scanfan03
Member
Thorny41587 said:
Yes, the BC 246T.
DaveH
Member
The Motorola 1-channel system is called VoC (voice over control). I've never heard one but they do exist.
The only scanners that track EDACS SCATS are the Unidens from the 250/785 on, not the 780, and none of the RS scanners including digital ones.
There are 1-channel LTR systems, that don't actually trunk i.e. go to any other channel. It is more of a conventional system with LTR to separate the user groups (like CTCSS/DCS), but has the option of upgrade to trunking.
Dave
The only scanners that track EDACS SCATS are the Unidens from the 250/785 on, not the 780, and none of the RS scanners including digital ones.
There are 1-channel LTR systems, that don't actually trunk i.e. go to any other channel. It is more of a conventional system with LTR to separate the user groups (like CTCSS/DCS), but has the option of upgrade to trunking.
Dave
Thorny41587
Member
RE:
Wouldn't that be a a lot cheaper than a trunking system?
Just have lots of user on the same freqs with different PL's EX:
460.475 - 173.8 Sheriff
460.475 - 192.8 EMS...
Wouldn't that be a a lot cheaper than a trunking system?
Just have lots of user on the same freqs with different PL's EX:
460.475 - 173.8 Sheriff
460.475 - 192.8 EMS...
troymail said:
In south Florida, the city of Deerfield Beach has a three channel Motorola trunked system for fire/rescue. They have like seven or eight talkgroups. It is being changed to become site 2 of Broward County's Smartzone system, and will likely get additional frequencies.
Re: RE:
If two users tried to transmit on your system they would cause interference to each other. With it being trunked one of the users would get a busy indication on his radio and would be locked out of the system.
Mike
Thorny41587 said:
If two users tried to transmit on your system they would cause interference to each other. With it being trunked one of the users would get a busy indication on his radio and would be locked out of the system.
Mike
With different PL/DPL's there would not be interference on the repeater.... except for the fact that there is no repeater made that is set up for multiple tones. You would need multiple repeaters utilizing different tones. Take a look at Lincoln County, MS's EOC set up... One freq for output- 155.8950 MHz.... Two repeaters, one North, one South... each with the same inputs.... But different tones. And for large multi county districts for MS's Dept of Forestry, and Agriculture.... One freq for the repeaters... up to two repeaters per county in each district... a different tone on each repeater.
But for those agencies that can do the trunking route, thats the smartest route to go.
But for those agencies that can do the trunking route, thats the smartest route to go.
DaveH
Member
milf said:
Not correct. There are lots of multi-user commercial repeaters which allow multiple tones. Otherwise they could not support multiple users. The repeater either passes them through, or receives and regenerates them. In the latter case, they can prohibit unauthorized users coming on with a tone that is not allocated to legit users in the system, a fairly low-level defense.
Dave
Thorny41587
Member
re:
On that last note, I cannot say I have ever heard someone who was not supposed to be transmitting on the LCS Frequency. Do these types of things happen? Is it even possible to program a freq and a PL and make it hit a public safety repeater?
On that last note, I cannot say I have ever heard someone who was not supposed to be transmitting on the LCS Frequency. Do these types of things happen? Is it even possible to program a freq and a PL and make it hit a public safety repeater?
milf said:
I'm sorry, but different PL/DPLs do not magically allow multiple simultaneous conversations on one frequency. You can if the two agencies are far removed so that the capture effect happens, but then you only hear one conversation. All PL/DPL does is keep your receiver closed if the correct tone isn't heard. Once your reciever opens up you are subject to interference.
If you could put multiple agencies on the same frequency with different PL/DPLs and not have interference, there would be no need to have more than one frequency nationwide.
Mike
Thorny41587
Member
re:
I see you're in Lima... do you listen to the city PD? If so, are they direct? Or on repeaters? I was down there about a year ago and 154.8 sounded direct.
I see you're in Lima... do you listen to the city PD? If so, are they direct? Or on repeaters? I was down there about a year ago and 154.8 sounded direct.
Lima PD, Lima FD, Shawnee Twp. FD, Elida FD and Allen County Sheriff are all running repeaters.
Mike
Mike
Thorny41587
Member
On that last note, I cannot say I have ever heard someone who was not supposed to be transmitting on the LCS Frequency. Do these types of things happen? Is it even possible to program a freq and a PL and make it hit a public safety repeater?
scanfan03
Member
Thorny41587 said:
Yes, with a transceiver of course!! :lol:
gr8amp
Member
milf said:
WHAT!?!? No repeater made that is setup for multiple tones? What leads you to make this bold assumption?
N
N_Jay
Guest
gr8amp said:
LOL, Because MILF "Knows what he knows". :roll:
Problem is; He doesn't know what he doesn'y know! :wink:
At lease he is willing to learn.
OK, no flames, just having fun.
Multi-PL/DPL repeaters have been around fpor a VERY long time.
They were called "Community Repeaters" back before Trunking.
They did what one channel trunking does in a simple way.
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