Ford Co Sheriff / Dodge City Police Frequencies help

[K0NYX]

I'm looking to setup 2 broadcastify feeds next time in the area for Ford Co sheriff and and Dodge City police. Last time I was back it looked like DC Police was using frequencies ~3 MHz above the control frequency which was over the bandwidth of a single rtl-sdr. If anyone is in the area and can provide some info for setting this up, it would be appreciated, I think I found the control frequency, but would like to confirm its not just some alt/secondary one since no one has actually marked them on radio reference yet. I would be using Raspberry Pis, RTL-SDR dongles (maybe?), and op25.

 

[K0NYX]

For Dodge City site WQYZ271 here is what it looks like so far from messing with getting sdrtrunk & op25 working:

Control Frequency: 856.2375
NAC: 0x1b5 (hex) / 437 (dec)
WACN: 0xbee00 (hex) / 781824 (dec)
SYSID / SYSTEM: 0x1b2 (hex) / 434 (dec)


Current Site
SYSTEM:434 SITE:45 RF SUBSYSTEM:1 LOCATION REGISTRATION AREA:0 STATUS:ACTIVE RFSS NETWORK CONNECTION
PRI CONTROL CHANNEL:0-837 DOWNLINK:856237500 UPLINK:811237500
SEC CONTROL CHANNEL:0-717 DOWNLINK:855487500 UPLINK:810487500
SEC CONTROL CHANNEL:0-757 DOWNLINK:855737500 UPLINK:810737500
SEC CONTROL CHANNEL:0-797 DOWNLINK:855987500 UPLINK:810987500
CURRENT DATA CHANNEL:0-673/----- DOWNLINK:855212500 UPLINK:0

Neighbor Sites
SYSTEM:434 SITE:23 LRA:0 RFSS:1 CHANNEL:0-233 DOWNLINK:852462500 UPLINK:807462500 STATUS:[VALID INFORMATION, ACTIVE RFSS CONNECTION]
SYSTEM:434 SITE:24 LRA:0 RFSS:1 CHANNEL:0-117 DOWNLINK:851737500 UPLINK:806737500 STATUS:[VALID INFORMATION, ACTIVE RFSS CONNECTION]
SYSTEM:434 SITE:27 LRA:0 RFSS:1 CHANNEL:0-209 DOWNLINK:852312500 UPLINK:807312500 STATUS:[VALID INFORMATION, ACTIVE RFSS CONNECTION]
SYSTEM:434 SITE:28 LRA:0 RFSS:1 CHANNEL:0-87 DOWNLINK:851550000 UPLINK:806550000 STATUS:[VALID INFORMATION, ACTIVE RFSS CONNECTION]
SYSTEM:434 SITE:46 LRA:0 RFSS:1 CHANNEL:0-1037 DOWNLINK:857487500 UPLINK:812487500 STATUS:[VALID INFORMATION, ACTIVE RFSS CONNECTION]
SYSTEM:434 SITE:47 LRA:0 RFSS:1 CHANNEL:0-1197 DOWNLINK:858487500 UPLINK:813487500 STATUS:[VALID INFORMATION, ACTIVE RFSS CONNECTION]

Frequency Bands
BAND:0 FDMA BASE:851006250 BANDWIDTH:12500 SPACING:6250 TRANSMIT OFFSET:-45000000
BAND:1 FDMA BASE:762006250 BANDWIDTH:12500 SPACING:6250 TRANSMIT OFFSET:30000000
BAND:2 TDMA BASE:851006250 BANDWIDTH:12500 SPACING:6250 TRANSMIT OFFSET:-1800000000 TIMESLOTS:2
BAND:3 TDMA BASE:762006250 BANDWIDTH:12500 SPACING:6250 TRANSMIT OFFSET:1200000000 TIMESLOTS:2

 

[K0NYX]

I added a new combined feed for DCPD and Ford Co SO here Dodge City Police Dispatch Live Audio Feed

Running on an Rasp Pi 3 B+ w/ RTL-SDR and using op25

 

[fuzzmanks]

was using frequencies ~3 MHz above the control frequency which was over the bandwidth of a single rtl-sdr.

I don't know anything about setting up feeds, but how did you solve the 'over the bandwidth' issue?

 

[K0NYX]

I don't know anything about setting up feeds, but how did you solve the 'over the bandwidth' issue?

It turns out it wasn't actually an issue when using op25, it can work with single RTL-SDR. For more info on how it works, boatboad who develops on op25 explained it to me here: How to use op25 w/ P25 systems spanning more than single RTL-SDR bandwidth