Looking For Help

Mojaveflyer

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In the last two months I've started to hear intermod or some other kind of interference on railroad frequencies in the lower part of the railroad band. The specific frequencies I'm hearing the noise on are 160.26, 160.32, and 160.26 MHz. I've asked on the Scanner Net we hold in the Denver Area on Sunday nights on a ham repeater for ideas...

Someone suggested trying putting the same frequency (160.32) with different types of modulation; NXDN, DMR, P-25 to see if I could find some thing to give me direction on where the interference is coming from. So far, the only type of modulation I found the interference on other than NFM, is P-25.

I'm thinking is a new control frequency since it's intermittent.

Does the group have any ideas?
 

abqscan

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can you post a recording of the interference you are hearing?
 

Mojaveflyer

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I forgot about the Sunday night Scanner Net. What frequency and time is it?
Every Sunday evening at 8 pm on the 145.46 repeater in Boulder and linked to the 145.16 repeater in Colorado Springs. The 145.46 repeater can be hit from almost allover the Denver Metro Area.
 

4436time

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Dec 18, 2009
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Colorado
In the last two months I've started to hear intermod or some other kind of interference on railroad frequencies in the lower part of the railroad band. The specific frequencies I'm hearing the noise on are 160.26, 160.32, and 160.26 MHz. I've asked on the Scanner Net we hold in the Denver Area on Sunday nights on a ham repeater for ideas...

Someone suggested trying putting the same frequency (160.32) with different types of modulation; NXDN, DMR, P-25 to see if I could find some thing to give me direction on where the interference is coming from. So far, the only type of modulation I found the interference on other than NFM, is P-25.

I'm thinking is a new control frequency since it's intermittent.

Does the group have any ideas?
I'm south of town and experiencing the same thing. It's also happening in the 167.xxx range and doesn't sound anything like Whiskey's link. Sounds more like a weak signal from here.
 

abqscan

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I've been getting a buzzing sound on the VHF Fed band too. I can't say I've heard of this type of digital signal before.
 

tvengr

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Baltimore County, MD
I read that this is based in Pueblo, but could possibly be running tests at other locations.

Transporation Technology Center

Operations

The Transportation Technology Center is a test facility/proving ground for the railroad industry
State of Colorado DTRS
Project 25 Phase I
TTC Fire is on DTRS
Transportation Technology Center
NXDN NEXEDGE 9600
Operations are also conducted on this system

FrequencyLicenseTypeToneAlpha TagDescriptionModeTag
160.32000WPRH365 RMTTC321 Ops 1Operations 1NXDNRailroad
160.35000WPRH365RMTTC325 Ops 2Operations 2NXDNRailroad
160.77000WPRH365RMTTC381 Ops 3Operations 3NXDNRailroad
160.81500WPRH365BMTTC387 Ops 4Operations 4NXDNRailroad
160.84500WPRH365BMCSQTTC049 Ops 5Operations 5FMNRailroad
160.87500WPRH365BMTTC395 Ops 6Operations 6NXDNRailroad
160.98000WPRH365BMTTC409 Ops 7Operations 7NXDNRailroad
161.01000WPRH365BMCSQTTC060 Ops 8Operations 8FMNRailroad
161.07000WPRH365 BMTTC421 Ops 9Operations 9NXDNRailroad
161.14500WPRH365BMCSQTTC069 Ops 10Operations 10FMNRailroad
161.19000WPRH365BMCSQTTC072 Ops 11Operations 11FMNRailroad
161.20500WPRH365BMTTC439 Ops 12Operations 12NXDNRailroad
161.32500WPRH365BMTTC455 Ops 13Operations 13NXDNRailroad
452.47500WPRH365BMCSQTTC UHF OpsOperations UHFFMNRailroad
 
Last edited:

Mojaveflyer

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Denver, Co
Interestingly enough, this 'interference' has stopped in the last week or two. I'm guessing it was a new system that was bleeding over in to other systems. Good ideas and I have no idea what it was but it's stopped.... Thanks for the suggestions!
 
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