I am a feed provider for Grant county central dispatch. The frequencies and talk groups went silent a couple days ago on the hoosier safe-T. I did some research and see there are new frequencies and talk groups listed for Grant county government so I programed them up and it's crickets. I opened them up and can hear state police on the safe-T but absolutely nothing on the new freqs. Anyone have any suggestions?
Grant county Central dispatch disappeared
- Thread starter RichTB
- Start date
VASCAR2
Member
Did you program the new Grant County 700 MHz trunked system. The system looks like Harris P25 Phase II simulcast system with three sites. There are Talk Groups listed for Sheriff/Police and Fire Dispatch. I’m to far away to try and monitor Grant County. Here is a link to the new Grant County system, shows RR updated a couple days ago.
FCC Callsign WRTK201 (GRANT, COUNTY OF)
FCC Callsign WRTK201 (GRANT, COUNTY OF)
www.radioreference.com
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- Jun 11, 2022
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I started scanning it when they switched on Monday. I was tracking the system while they were testing. The main thing to watch is they change control frequencies fairly often. Using the automatic definitions from RR did NOT allow SDRTrunk to see there were alternate controls available. You need to make sure they're all in your settings regardless of hardware/software.
They are also being weird. I initially set up in LSM mode for simulcast. This did work but then in working out more details I saw some oddities. Turns they are ALSO transmitting C4FM of the same data. I've never seen this before on the same system. Also they are NOT using TDMA which surprised me greatlt.
Furthermore fire has occasionally tested but is completely on the old system. Also small-town police dispatch (Jonesboro, Van Buren, etc.) is still on the old system. Thus we effectively have three law dispatch channels with no overlap.
Only two - Marion Police and MGH are totally on the new system. MGH is apparently the on encrypted channels I see and are not seen elsewhere.
If you are truly getting no county law or fire, something more is broken. To compare, you can check my calls feeds on nodes 1762 and 2469.
I'm willing to offer more advice but I've got to know a lot more details. I know several people who seem to have their Unidens working right, though generally with effort. What settings are you using?
They are also being weird. I initially set up in LSM mode for simulcast. This did work but then in working out more details I saw some oddities. Turns they are ALSO transmitting C4FM of the same data. I've never seen this before on the same system. Also they are NOT using TDMA which surprised me greatlt.
Furthermore fire has occasionally tested but is completely on the old system. Also small-town police dispatch (Jonesboro, Van Buren, etc.) is still on the old system. Thus we effectively have three law dispatch channels with no overlap.
Only two - Marion Police and MGH are totally on the new system. MGH is apparently the on encrypted channels I see and are not seen elsewhere.
If you are truly getting no county law or fire, something more is broken. To compare, you can check my calls feeds on nodes 1762 and 2469.
I'm willing to offer more advice but I've got to know a lot more details. I know several people who seem to have their Unidens working right, though generally with effort. What settings are you using?
wtp
Member
769.60625000
770.83125000
771.78125000
772.23125000
772.55625000
772.95625000
out of 90 these are the only ones you need.
770.83125000
771.78125000
772.23125000
772.55625000
772.95625000
out of 90 these are the only ones you need.
DVINTHEHOUSEMAN
Up North
Wait, so they're transmitting C4FM simulcast or they're doing both CQPSK and C4FM at the same time? Either way, it is definitely weird.
They could just be running FDMA for now until they get everyone on board, then they'll probably start switching to TDMA. Being a new Harris system, it's a little surprising to see they didn't try to upsell the TDMA control channel, at least for now.
west-pac
Member
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- Nov 13, 2004
- Messages
- 1,574
They're reusing their current radios. Without a doubt some of them are not Phase 2 capable. As more users come online, and as Phase 1 radios get replaced with Phase 2 radios, doubling the capacity of the system is built-in by simply switching from FDMA to TDMA.
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Yes. That was done late afternoon Friday. When I commented this was too new to be sure of.
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Was thinking it over. It may be the latest SDRTrunk will switch it if set wrong. I've got more pressing issues than this so it's on a very back burner.
That's been my assumption. The frequencies are a tad sparse without it.
Hi guys, thanks for responding. After I posted I realised my scanner wasn't compatible with phase 2 so I ordered a BCD325P2.
Are you guys saying it's simulcast? Then my BCD325P2 wont work, am I correct?
Someone said some police are still on the old system, I can verify that is incorrect. I hear no local police at all on the phase 1 system.
Are you guys saying it's simulcast? Then my BCD325P2 wont work, am I correct?
Someone said some police are still on the old system, I can verify that is incorrect. I hear no local police at all on the phase 1 system.
west-pac
Member
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- Messages
- 1,574
It is a 3-site simulcast radio system.
I have sdr trunk and one dongle. I truely wish I knew how to run it lol. I also have to confess when you said
I was completely lost. I have a mind for this kind of thing but life has gotten in the way of my hobbies.
I was using a radio shack scanner for the safe-t system. I ordered a BCD325P2 but I'm afraid it won't work if the p2 system is simulcast, not sure yet. I do appreciate your comment.
Is there something about the BCD325P2 that keeps it from working on simulcast systems? Some radios, such as the SDS100/SDS200 handle simulcast systems better than others, but I'm not aware of radios that simply won't decode simulcast at all.
DVINTHEHOUSEMAN
Up North
There is a chance you will be in a "good spot" for receiving the system where it'll catch most transmissions, but that's only a chance. Most likely you'll have poor performance with the 325P2, but it's worth a shot.
DVINTHEHOUSEMAN
Up North
I've heard that destructive interference from the signals being out of phase messes up the P25 packet data, or that there's an AM component in CQPSK that is difficult to pull with an FM receiver. From my findings, most receivers will decode CQPSK by itself but in a simulcast environment they really struggle if the place they're at isn't perfect.
Whistlers. I owned a TRX-1 briefly, got zero pick up on a number of my region's simulcast systems while within coverage area, not even a chirp or hiccup. Not meaning to derail the topic at hand but they do exist
VASCAR2
Member
I have a BCD325P2 hand held and it struggles with simulcast systems. Some areas it works but it is really location specific on how much if any it receives. While I was staying in an area that had 800 MHz simulcast trunked I tried everything within reason to get my BCD996XT and BCD325P2 to receive. No luck at that location but I could drive around and would find locations where those scanners received. The SDS100/200 are probably the best solution if you want to monitor simulcast systems.
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