Do you have underground utilities or aerial? Could be corrosion/oxidation on fuses or surge protection devices on the power lines if aerial. I had nasty interference on VHF all over a coastal town due to that. I actually got the power company to clean it all up.Then is must really be bad, I was still receiving it almost 2 miles away in the car.
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Specific interference on the VHF Business High band
- Thread starter videobruce
- Start date
Wherever this is coming from it's surely not here! I would of found it months ago!! I can drive 2 miles away and still pick it up using the same model scanner receiver in the car w/ a roof antenna.
The only thing I have a local problem with is my next door neighbors outdoor hot tub that generates broadband noise around 390MHz that almost wipes out operation of one of my garage door openers. The other opener operates at 314MHz and isn't affected.
The power utilities are aerial and the service was almost fully replaced (new poles & xformers) many years ago. We rarely have power failures unlike before that was due to a overloaded neighborhood feeders. Again, there is a substation near, but that isn't it.
I wonder if this new 5G cell service just above the cutdown UHF TV spectrum (above 600 MHz) would cause it?
The only thing I have a local problem with is my next door neighbors outdoor hot tub that generates broadband noise around 390MHz that almost wipes out operation of one of my garage door openers. The other opener operates at 314MHz and isn't affected.
The power utilities are aerial and the service was almost fully replaced (new poles & xformers) many years ago. We rarely have power failures unlike before that was due to a overloaded neighborhood feeders. Again, there is a substation near, but that isn't it.
I wonder if this new 5G cell service just above the cutdown UHF TV spectrum (above 600 MHz) would cause it?
I still wouldn’t rule out power line issues.
I’d revisit the spectrum analyzer and adjust the gain, resolution and reference level to be able to see a several MHz wide chunk of spectrum with the bottom being less than -110 dBm at least if possible.
Taking a much closer look at this, I narrowed down the span to 500kHz + & - and tried to follow this interference. It runs around 20dB above the noise floor. No preamp in use, I have 2 FM broadcast stations 1 mile away (in opposite directions). It fluctuates in strength by around 5 dB and the drifting jumps back & forth.
For example;
For example;
Attachments
Sure sounds like a VOR (that sample was probably from an AM detector, not an FM discriminator).
One intermod possibility: 3 x FMBroadcast - VOR = VHF high
Nearby (10 km radius from centroid of Buffalo) high-power (> 40 kW ERP) FM broadcast include: 92.9 @ 76 kW, 93.7 @ 47, 96.1 @ 47, 103.3 @ 49, 104.1 @ 50, 106.5 @ 50
Nearby VORs include: 116.4 BUF, 111.0 IAG, 116.2 DKK, 108.2 GEE (more?)
There are certainly other mix possibilities that could include high-power VHF (maybe a trunking control channel)?
Or maybe one of the VORs has just gone squirrely all by itself.
One intermod possibility: 3 x FMBroadcast - VOR = VHF high
Nearby (10 km radius from centroid of Buffalo) high-power (> 40 kW ERP) FM broadcast include: 92.9 @ 76 kW, 93.7 @ 47, 96.1 @ 47, 103.3 @ 49, 104.1 @ 50, 106.5 @ 50
Nearby VORs include: 116.4 BUF, 111.0 IAG, 116.2 DKK, 108.2 GEE (more?)
There are certainly other mix possibilities that could include high-power VHF (maybe a trunking control channel)?
Or maybe one of the VORs has just gone squirrely all by itself.
mrsvensven
Member
- Joined
- Jul 27, 2006
- Messages
- 155
How far to the left and right does the signal move? If it moves over a swath of spectrum wider than a standard 12.5KHz channel, it's certainly interference and not a legitimate signal from any licensed user.
The fact that you can see it so cleanly on the spectrum analyzer means this should be relatively easy to track down. Go for a drive and see in what direction the signal gets stronger. You should be able to get within a block or two just by driving around and looking at signal strength. If you have a good directional antenna to see in what direction the signal is strongest, you might be able to track it faster and/or to a more precise location.
The recordings were FM mode. I did switch to AM and it was basically the same, but at a much lower audio level. I also tried WFM, but there was close to no audio heard.
160.80 seems the lowest it goes and 161.25 seems to be the highest. That screen save span was 1MHz total.
That Siglent SA is AC only. I do have a 'RF Explorer' that I could use, but I would want to limit it to it's own antenna due to overload caution warnings in their literature.
160.80 seems the lowest it goes and 161.25 seems to be the highest. That screen save span was 1MHz total.
That Siglent SA is AC only. I do have a 'RF Explorer' that I could use, but I would want to limit it to it's own antenna due to overload caution warnings in their literature.
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