ODOT on 453.025?

[ScanRite]

I rolled up on an accident north of Cottage Grove yesterday, so I turned on my Signal Stalker to pick up anything going on. The ODOT Incident Repsonse truck pulled up right beside me and keyed up on 453.025. I searched the FCC database and only found 2 licenses on that freq, and ODOT wasn't one of them.

 

[KE7JFF]

I rolled up on an accident north of Cottage Grove yesterday, so I turned on my Signal Stalker to pick up anything going on. The ODOT Incident Repsonse truck pulled up right beside me and keyed up on 453.025. I searched the FCC database and only found 2 licenses on that freq, and ODOT wasn't one of them.

I'll put that in the radio today and see what I find since I have to go to Vancouver at the start of rush hour where there is bound to be an accident.

 

[ScanRite]

This was a Eugene ODOT unit, so not sure if they'd use the same freq up here in Portland.

 

[KE7JFF]

Yeah, I was thinking of that too, but you never know.

I do see that 453.025 and 458.025 is however licensed to the State Fire Marshall for the purpose "FOR MUTUAL AID BETWEEN STATE AND LOCAL AGENCIES."

 

[weco12]

I have seen the programming list used in ODOT trucks and they do not include any UHF freqs. Currently ODOT is using Kenwood mobile radios.

 

[mikepdx]

...The ODOT Incident Repsonse truck pulled up right beside me and keyed up on 453.025...

The input to ODOT's Repeater in Eugene (158.745 MHz) is 151.01 MHz.

151.01 * 3 = 453.03
453.03 is the third Harmonic of the fundamental frequency.
- close enough.

Your receiver would logically show 453.025 MHz if it is set to a 25 kHz step,
particularly in a very high strength RF field - like with the transmitter right next to you...
Some distance away, you wouldn't have detected anything on UHF.

Moral of the story: Beware of harmonics, spurs & images. They can lead you astray.

Happy Scanning!

 

[ScanRite]

I was actually leaning toward a harmonic. For one, the audio was a bit distorted, off frequency sounding. There was no PL tone captured either. There was a trooper up ahead of me that I did capture on VHF, but again, the ODOT guy was literally 3 feet away from my antenna. Since I haven't lived in Eugene for a while and I know a bunch of their city/county stuff is in the 453.x freqs now, I thought maybe that was a possibility, although it wasn't digital. Just thought I'd throw it out there and see if anything came of it, but I too was convinced it was a harmonic.

 

[Hopscotch]

Duane, ODOT here is still in the 158.745, I've not heard that 453mHz you've been talking about, I'll plug it in as well and see what becomes of it as well.

Jeff, KE7OUR

 

[DustinRoss]

Many of the ODOT IR units are using multiple radios in their trucks. The Salem units are running VHF, UHF and 800 MHz. The primary use in the Portland area for IR is 800 MHz utilizing Portland's 800 system with permissions to use Washington and Clackamas county systems. The rest of ODOT (IR Included) across the state is primarily on VHF. However they all carry other agency radios for the use of public safety functions.

 

[DickH]

Many of the ODOT IR units are using multiple radios in their trucks. The Salem units are running VHF, UHF and 800 MHz. The primary use in the Portland area for IR is 800 MHz utilizing Portland's 800 system with permissions to use Washington and Clackamas county systems. The rest of ODOT (IR Included) across the state is primarily on VHF. However they all carry other agency radios for the use of public safety functions.

Here are their Portland talk groups:
17008 - Patch to 154.100
17072 - TAC-1
17168 - Dispatch
They have also come up on Portland Fire OPS talk groups.