uhf frequency simulcast of a vhf
- Thread starter jpm
- Start date
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fmon
Silent Key Jan. 14, 2012
jpm said:
In the interest of keeping your feed alive, could the system be in the Cook County Public Safety Motorola ASTRO 3600 baud?
This 3-year-old note is on the RR Database for Cook County: Currently used at the County Jail, will soon be used countywide. System is currently a Type II Smartnet system, with upgrade to Project-25 expected over the next few years for all Countywide Public Safety and Services. 4 vhf freqs are listed simulcast
UHF Retransmission of VHF
Original inquiry:
The digital system i'm monitoring no longer uses a uhf convetional frequency. Another 911 dispatch center picked it up simulcasting IFERN which is a vhf frequency. Any input on the reasoning for this. thanks in advance for the input.
My response:
The system you are referring to is the Northwest Central Dispatch System that converted a couple years back from 2 UHF police repeaters, a conventional 800 MHz police repeater and a couple VHF fire simplex channels to am 8 channel 800 MHz 3600 baud Astro system. The 2 former UHF police repeaters (470.3625 and 470.4375) were dismantled and then picked up by DuComm. DuComm is a huge central dispatch agency that serves about half of DuPage County, just south of NWCD's territory.
DuComm is currently using these UHF pairs to rebroadcast IFERN (154.265), the local Fire Mutual Aid channel and ISPERN (155.475), the police aid channel. With several satellite recievers and a voter for each channel these allow field units to hear these important channels on their UHF radios and to hear the same traffic their base does.
For the scanner listener this allows one to hear traffic from much further out on what are probably the 2 most interesting channels in the area.
Original inquiry:
The digital system i'm monitoring no longer uses a uhf convetional frequency. Another 911 dispatch center picked it up simulcasting IFERN which is a vhf frequency. Any input on the reasoning for this. thanks in advance for the input.
My response:
The system you are referring to is the Northwest Central Dispatch System that converted a couple years back from 2 UHF police repeaters, a conventional 800 MHz police repeater and a couple VHF fire simplex channels to am 8 channel 800 MHz 3600 baud Astro system. The 2 former UHF police repeaters (470.3625 and 470.4375) were dismantled and then picked up by DuComm. DuComm is a huge central dispatch agency that serves about half of DuPage County, just south of NWCD's territory.
DuComm is currently using these UHF pairs to rebroadcast IFERN (154.265), the local Fire Mutual Aid channel and ISPERN (155.475), the police aid channel. With several satellite recievers and a voter for each channel these allow field units to hear these important channels on their UHF radios and to hear the same traffic their base does.
For the scanner listener this allows one to hear traffic from much further out on what are probably the 2 most interesting channels in the area.
RADIOGUY2002
Member
What a great idea, puzzling?
I wish more agencys would follow suit and learn how to think of why this actulley happened. DuComm you get your props again for making such a plan become a reality. Great idea in many formats, fd and pd as well as scanner listners. I just wish others would understand the reason why these are so critical things, and implent them in their radios. I guess they do not want to hear it from guy that know a good portion of radio stuff, their loss. Especially when working massive traffic details with no way to hear the guy in squad car over the uhf radio, because the band path does not crosepond. But, yet spend 200,000 thousand dollars to upgrade their comm center so they can hear the fd, so they know when to send a squad car, puzzling. But forget to add the special broadcasts freq's in their handheld radio because someone said they could not. Absoulity amazing, and know I understand why some officers chose to get their own radios.
I wish more agencys would follow suit and learn how to think of why this actulley happened. DuComm you get your props again for making such a plan become a reality. Great idea in many formats, fd and pd as well as scanner listners. I just wish others would understand the reason why these are so critical things, and implent them in their radios. I guess they do not want to hear it from guy that know a good portion of radio stuff, their loss. Especially when working massive traffic details with no way to hear the guy in squad car over the uhf radio, because the band path does not crosepond. But, yet spend 200,000 thousand dollars to upgrade their comm center so they can hear the fd, so they know when to send a squad car, puzzling. But forget to add the special broadcasts freq's in their handheld radio because someone said they could not. Absoulity amazing, and know I understand why some officers chose to get their own radios.
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