Any ideas on how to resolve this noise/interference with FM broadcast?

[pclover]

So, This noise/interference has been present for awhile and is very annoying. Causing unneeded noise on empty and licensed stations.

This is using a FM yagi pointed in the direction of 92.7 KTOM. When I rotate the yagi the noise begins to drop off. If i rotate it completely in the opposite direction it almost disappears. If I switch a indoor dipole the noise is drastically reduced.

Previously, I was under the impression 92.7 KTOM here has noisy HD radio transmitter but I figured I'd again ask for opinions. I did happen to catch the 92.7 KTOM transmitter off briefly and the noise was gone for that period of time but could be nothing.

If I tune around the noise with AM I do hear HD hiss sound. Probably means nothing but would mention it anyways.

Yes, There is local noise and spurs present but not this very wideband noise.

Any ideas?

 

[Deleted User]

and what standing do you have?

Interference on an empty freq is the reason they exist, well at least one of the reasons

As to the other stations is the alleged interference within their protected contour.

What licensed stations are you alleging they bothering?

Are you their Engineer?

Trust me if there was real interference, their CE would be calling the other station and saying WTF.

 

[pclover]

and what standing do you have?

Interference on an empty freq is the reason they exist, well at least one of the reasons

As to the other stations is the alleged interference within their protected contour.

What licensed stations are you alleging they bothering?

Are you their Engineer?

Trust me if there was real interference, their CE would be calling the other station and saying WTF.

Why I am asking again for ideas, opinions and explaining again what I've seen. Perhaps somebody has an easy idea... Perhaps something has seen similar and resolved it on their end.

This has never been present this badly and just suddenly appeared like month or two ago.

In this case it would be 91.5 KSPB having noise that shouldn't be there from what I see.

Again, Looking at ideas of what I might be seeing since my intimal impressions are probably wrong. Is that too much to ask?

 

[SomeRadioGuy]

Why I am asking again for ideas, opinions and explaining again what I've seen. Perhaps somebody has an easy idea... Perhaps something has seen similar and resolved it on their end.

This has never been present this badly and just suddenly appeared like month or two ago.

In this case it would be 91.5 KSPB having noise that shouldn't be there from what I see.

Again, Looking at ideas of what I might be seeing since my intimal impressions are probably wrong. Is that too much to ask?

check it on other radios far away from the transmitter.

your using an SDR and have repeatedly been told those are not good options to use to complain about an issue. SDRs overload easy.

 

[pclover]

check it on other radios far away from the transmitter.

your using an SDR and have repeatedly been told those are not good options to use to complain about an issue. SDRs overload easy.

How far away would you say is good? I'm around 30 miles away as is right now.

Decided to try out my Sony S10HDIP to the same antenna. It's the same as the F1HD RX performance wise. With 92.1 is showing 2 to 3 signal bars of noise on something that should be empty?

Not the best test but something I did anyways.

Irritating that I can't resolve this noise on my own. Perhaps nobody is at fault and just is what it is.

 

[davideduardo]

your using an SDR and have repeatedly been told those are not good options to use to complain about an issue. SDRs overload easy.

In particular, the cheap SDRs that you can get online via Amazon or eBay.

In another thread (where you also commented) it was suggested that a new 1kw FM transmitter could be obtained for about a kilobuck. Of course, that was off by a multiple of about 7 to 10. This is where posters with no experience need to ask the many pros here for an opinion or guidance first.

 

[davideduardo]

Perhaps nobody is at fault and just is what it is.

Ya' think?

 

[pclover]

In particular, the cheap SDRs that you can get online via Amazon or eBay.

Those are mostly the RTL-SDR which really is a hack to get it work as a SDR. It uses a I/Q output debug mode. They really don't have any front end filtering or front end. The better SDRs actually are built to be a radio and much better and don't overload as easily. TBH I think the RTL-SDR has really soured the reputation of SDRs in general as junk because this was never intended for it.

In another thread (where you also commented) it was suggested that a new 1kw FM transmitter could be obtained for about a kilobuck. Of course, that was off by a multiple of about 7 to 10. This is where posters with no experience need to ask the many pros here for an opinion or guidance first.

I'm obviously not working in broadcasting and that sounds way off. I figure dirt cheap transmitters do exist that maybe could get to this price point However, They are probably awful with zero regards to harmonic suppression and filtering and probably in no way would be complaint with any regulations. Who knows what they actually sound like as well. Probably would be nasty PWM transmitter stuff.

The 7 to 10 figure is probably accurate for something that isn't pile of garbage.

Ya' think?

Yeah, Just trying to see if there is anything i can do to reduce besides rotating antennas away. Maybe somebody has other ideas to try. Perhaps in time it will resolve itself like it has before.

 

[davideduardo]

I'm obviously not working in broadcasting and that sounds way off. I figure dirt cheap transmitters do exist that maybe could get to this price point However, They are probably awful with zero regards to harmonic suppression and filtering and probably in no way would be complaint with any regulations.

Transmitters have to be "type accepted" and in compliance with FCC standards to be used in the US. So it does not matter what the array of junk available online contains... very few can legally be used in the USA.

 

[pclover]

Transmitters have to be "type accepted" and in compliance with FCC standards to be used in the US. So it does not matter what the array of junk available online contains... very few can legally be used in the USA.

Which puts the 7-10k as much more realistic figure.

Nautel VX1 just what I randomly found as real product that exist.

 

[pclover]

https://www.radiodiscussions.com/th...w-do-i-get-them-to-fix-it.762759/post-6610521 So in my other thread just saw this reply.

One opinion here at least that iHeart is a at fault and they've seen similar behavior before. Hopefully if there is an issue it does get fixed.