Looking For Help

[Mojaveflyer]

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]

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

 

[eyes00only]

I forgot about the Sunday night Scanner Net. What frequency and time is it?

 

[Whiskey3JMC]

I'm thinking is a new control frequency since it's intermittent.
Does the group have any ideas?

How intermittent? Is it a burst of noise every few seconds?

 

[Mojaveflyer]

Seems like once a minute or so, then it disappears for a few minutes.

 

[Whiskey3JMC]

I know NXDN is used on the rail bands, does it sound anything like these?

 

[Mojaveflyer]

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.

 

[Mojaveflyer]

I know NXDN is used on the rail bands, does it sound anything like these?

The only NXDN usage I'm aware of is the TTC east of Pueblo and the Cumbres & Toltec Tourist railroad in the San Luis Valley. Neither are near Denver.

 

[eyes00only]

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.

Thank you!

 

[4436time]

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]

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]

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

Frequency	License	Type	Tone	Alpha Tag	Description	Mode	Tag
160.32000	WPRH365	RM		TTC321 Ops 1	Operations 1	NXDN	Railroad
160.35000	WPRH365	RM		TTC325 Ops 2	Operations 2	NXDN	Railroad
160.77000	WPRH365	RM		TTC381 Ops 3	Operations 3	NXDN	Railroad
160.81500	WPRH365	BM		TTC387 Ops 4	Operations 4	NXDN	Railroad
160.84500	WPRH365	BM	CSQ	TTC049 Ops 5	Operations 5	FMN	Railroad
160.87500	WPRH365	BM		TTC395 Ops 6	Operations 6	NXDN	Railroad
160.98000	WPRH365	BM		TTC409 Ops 7	Operations 7	NXDN	Railroad
161.01000	WPRH365	BM	CSQ	TTC060 Ops 8	Operations 8	FMN	Railroad
161.07000	WPRH365	BM		TTC421 Ops 9	Operations 9	NXDN	Railroad
161.14500	WPRH365	BM	CSQ	TTC069 Ops 10	Operations 10	FMN	Railroad
161.19000	WPRH365	BM	CSQ	TTC072 Ops 11	Operations 11	FMN	Railroad
161.20500	WPRH365	BM		TTC439 Ops 12	Operations 12	NXDN	Railroad
161.32500	WPRH365	BM		TTC455 Ops 13	Operations 13	NXDN	Railroad
452.47500	WPRH365	BM	CSQ	TTC UHF Ops	Operations UHF	FMN	Railroad

 

[Mojaveflyer]

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!