Rail band? Could it be NXDN?
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Specific interference on the VHF Business High band
- Thread starter videobruce
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Whiskey3JMC;
Absolutely not, no carrier in this area has made the switch yet. There is activity 50 miles north of me in the Toronto area, but not here. Again, I have the NXDN plug-in.As to electrical, there is a power utility sub station a couple of blocks away, but I've been by there and the strength isn't any stronger. My last scouting expedition I went past the City Zoo which is somewhat close to me and it seemed stronger there, but I will have to get closer and start disconnecting the antenna to see if it is still receivable or not.
Could this be SCADA Traffic? We have an Electric Company using SCADA on UHF.
www.aowireless.com
Wireless SCADA Telemetry Radio Systems
SCADA wireless systems are used to create connectivity with SCADA networks that control various wireless components.
www.aowireless.com
But would UHF activity filter down into VHF??
If you read article I added it states VHF, UHF, 700, 800, and LTE.
I meant the P1225, which probably has much tighter IF filtering than the scanners. If you're programmed for a narrowband channel, ~11 kHz wide, and you receive a 20 kHz wide signal (e.g., paging), it may sound like "noise" to your squelch or other audio processing logic. If you have access to CPS, there should be an "open squelch" function that you can program a function button to toggle, to take that logic out of the picture and hear whatever is there. The point of this, of course, is to determine whether or not the signal is actually on that channel ("over the air") or whether it is just being created in the scanner receivers (i.e., you don't hear it on the P1225). More later...
I did scan thru the page, but that was not what I was referring to which is harmonics or sub-harmonics that filter up or down from the actual frequency they are suing. What you referred to was a number of separate frequencies in multiple bands. VHF was mentioned, but nothing more specific than that.
Do you or anyone else know what those xmissions actually sound like on a conventional receiver?
stand by, i think i have an example. (and its not anything like this)
AM909;
I did more testing, specific with the 1225 running when this interference is happening and I did find some of it was getting thru the 1225. Not as strong, but there. It was breaking squelch, but that was about it. The audio was different (which I understand) due to the tighter bandwidth and filtering.I made some more recordings. Let me review them and will post the most interesting ones including ones from the 2006 and the P1225.
This is what SCADA sounds like.
Ok, not even close to what I'm hearing ! If that was all I would get, it almost wouldn't be a issue compared to what it sounds like then and now. 
yeah, i'm still stuck on it being electrical.
The cycles are peaking at around 690 hz, and the spacing doesnt seem to be a multiple of 60, so its got me thrown too.
The cycles are peaking at around 690 hz, and the spacing doesnt seem to be a multiple of 60, so its got me thrown too.
Ubbe
Member
Try listening in AM mode as it might be easier to hear what it is. It doesn't sound as if it is FM modulated but also try FM broadcast wide if it is transmitting over a wider frequency range. If you have IFX capability in a scanner it should not matter if you quickly enable that and the signal can still be heard if that signal are actually on that exact frequency and not just some intermod overload issue.
/Ubbe
/Ubbe
No IFX in this 996 AFAIK.
I made some more recordings, one off the 2004, another off the 2006 and one off the Moto P1225.
Doing so, with the 1225 I did discover some interference on one of the 4 RR channels I have had programed in. It basically sounded like a open squelch situation, thou there is no external squelch control on that radio.
Rename the files to .mp3
I was manually tuning the receivers via the 'Direct' function w/ the squelch off, hence some short 'bursts of broadband noise not related to the interference.
I made some more recordings, one off the 2004, another off the 2006 and one off the Moto P1225.
Doing so, with the 1225 I did discover some interference on one of the 4 RR channels I have had programed in. It basically sounded like a open squelch situation, thou there is no external squelch control on that radio.
Rename the files to .mp3
I was manually tuning the receivers via the 'Direct' function w/ the squelch off, hence some short 'bursts of broadband noise not related to the interference.
So now we can be fairly confident that the signal is actually radiating over-the-air on the freq to which you are tuned.
Here's a pic of the earlier clip in time domain and then frequency domain, shown in Audacity, which I really need to learn to use. It's clearly composed of many different frequencies (like most things). The longest period is 0.029s +/- 0.001s – about 34Hz – it wanders around a little. The spectrum plot shows most of the energy is at around 700 Hz, which agrees with what it sounds like, though some of this could just be introduced by looking at it with the wrong type of demodulator and/or bandwidth. Sounds like a job for the SigIDWiki.
Here's a pic of the earlier clip in time domain and then frequency domain, shown in Audacity, which I really need to learn to use. It's clearly composed of many different frequencies (like most things). The longest period is 0.029s +/- 0.001s – about 34Hz – it wanders around a little. The spectrum plot shows most of the energy is at around 700 Hz, which agrees with what it sounds like, though some of this could just be introduced by looking at it with the wrong type of demodulator and/or bandwidth. Sounds like a job for the SigIDWiki.
The original interference (on the same frequency range centered around 161 MHz was very different is 'sound'. It seem to have overtones of an analog (non ATSC) television signal. I immediately thought of ATV; Amateur Television since it seemed to be very
dirty' sounding and it drifted like crazy (as a bad xmitter 'warming up'. But, this is different than before, but the same frequencies which makes it stranger.
Anyway, those recordings did have my narrative mixed in when I was 'tuning' back and forth. Unfortunately I don't have a VFO tunable receiver which would make it far easier.
dirty' sounding and it drifted like crazy (as a bad xmitter 'warming up'. But, this is different than before, but the same frequencies which makes it stranger.
Anyway, those recordings did have my narrative mixed in when I was 'tuning' back and forth. Unfortunately I don't have a VFO tunable receiver which would make it far easier.
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So now we can be fairly confident that the signal is actually radiating over-the-air on the freq to which you are tuned.
Here's a pic of the earlier clip in time domain and then frequency domain, shown in Audacity, which I really need to learn to use. It's clearly composed of many different frequencies (like most things). The longest period is 0.029s +/- 0.001s – about 34Hz – it wanders around a little. The spectrum plot shows most of the energy is at around 700 Hz, which agrees with what it sounds like, though some of this could just be introduced by looking at it with the wrong type of demodulator and/or bandwidth. Sounds like a job for the SigIDWiki.
View attachment 148333
View attachment 148335
Such a useful program. Thats also how i was looking at the original clip, which was peaking around 690
Ok, lets say it is electrical, just how do I try to pin it down??
Turn things off, monitor, turn them back on, monitor...lather rinse repeat.
Once you get outside of your house, you bring a directional antenna into play.
Ubbe
Member
You can use a portable receiver tuned to that frequency. Hold its antenna horizontal pointing away from you. Then turn yourself around and when the signal are the weakest the antenna will point at the source. If you are 180 from the source it will be even weaker as your body will block the signal. You can use the attenuator function to reduce the signal level to be able to tell when the signal goes weaker, by the background noise level or by the signal bars.
Sometimes it's easier to do in AM mode and also using a different antenna with less gain in the frequency band, if the signal are too strong. Try and go as far away as possible in two opposite directions to get a triangulation. Radiosignals bounce and reflects off buildings and other objects that can fool you.
/Ubbe
Sometimes it's easier to do in AM mode and also using a different antenna with less gain in the frequency band, if the signal are too strong. Try and go as far away as possible in two opposite directions to get a triangulation. Radiosignals bounce and reflects off buildings and other objects that can fool you.
/Ubbe
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