hawks4ever
Member
Does the Iowa Highway Patrol still use 155.430?
When I visited the area near Sioux City, I noticed that I could hear the Troopers on occasion, not on a frequent basis. I suppose they are using MDT. I did think it was odd that DOT had an enforcement arm. When I did hear DOT, they were using encryption. I've not been there in a while. Hopefully, when I return with my 436HP, I will be able to discover more frequencies.
The DOT uses P25....and rarely uses encryption. Most of the DOT P25 is maintenance rather than Enforcement.
I don't understand why you would think it odd that the DOT has enforcement....most states have MV Enforcement although many have the Troopers doing that instead of a stand alone Law Enforcement agency
Troopers, DOT Enforcement and most other agencies use either MDT's or cellphones for any sensitive traffic.
MOST dispatching is done in the clear ( although depending on the agency it might be P25)
You are not going to "discover" many frequencies that are not in the RR Database
First of all, I was making reference to several states who don't have an enforcement division of DOT as a separate state agency. In Texas, for instance, these are two separate state agencies. The diesel cops, as some call them, are a division of DPS, not DOT. I believe the same thing applies to several other states. Some don't have a separate DOT enforcement division. Yes, I am fully aware of the commercial enforcement of Troopers.
When I've visited Sioux City, I have heard distinct P25 encryption on the DOT frequencies. I might add that the sound I heard was not the sound heard when P25 transmissions are out of range, underwater sounds. No, it is not a frequent occurrence, but it has been observed by this listener.
If you are making reference to the RR being up to date and accurate, I don't agree. I've found and corrected many frequencies and talk groups over the years. There are sections of Texas where the RR DB is vey outdated and inaccurate (Gray County recently updated, someone recently corrected such).
I don't know about Iowa & the accuracy of the RR DB there.
Until recently, the IDOT Enforcement division drove blue sedans with license plates/unit numbers starting with T, leading to them being referred to as "Smurfs" or T-cars. Recently the sedans have been replaced with white SUVs, marked similarly to the ISP squads.
When I visited the area near Sioux City, I noticed that I could hear the Troopers on occasion, not on a frequent basis. I suppose they are using MDT. I did think it was odd that DOT had an enforcement arm. When I did hear DOT, they were using encryption. I've not been there in a while. Hopefully, when I return with my 436HP, I will be able to discover more frequencies.