Whats up with 470.3000mhz - 470.3175MHZ?

[Dimmer_gamer]

Since I first got my hands on a radio scanner in 2020, i would just go about searching every frequency it can go to. Theres that specific strech of frequencies, 470.3000mhz - 470.3175MHZ, which would always be active, and staticy. Im aware those are also within the televesion broadcast, but this may be unrelated. When I got my baofeng UV-5R, a year later, that same frequency was diffrent. Its like a low highpitch humming sound, with a slight buzzing, and whenever you jiggle the anntenna or move the radio like, in big circles, theres like a constant clicking sound. Now, on the base scanner. which is the Realistic 60CHannel pro-2024, its just static, seems like only on the baofeng it makes that sound I described. Also to note, this sound, and these frequencies, are always active 24/7. If anyone knows about these frequencies, or if anyone can check it out, that would be helpful, im extremly curious.

 

[KevinC]

Broadcast TV channel 14 pilot carrier.

 

[Dimmer_gamer]

Broadcast TV channel 14 pilot carrier.

What is the sound then? Knowing near me theres absolute zero analog channels brodcasting.

 

[ecps92]

Since I first got my hands on a radio scanner in 2020, i would just go about searching every frequency it can go to. Theres that specific strech of frequencies, 470.3000mhz - 470.3175MHZ, which would always be active, and staticy. Im aware those are also within the televesion broadcast, but this may be unrelated. When I got my baofeng UV-5R, a year later, that same frequency was diffrent. Its like a low highpitch humming sound, with a slight buzzing, and whenever you jiggle the anntenna or move the radio like, in big circles, theres like a constant clicking sound. Now, on the base scanner. which is the Realistic 60CHannel pro-2024, its just static, seems like only on the baofeng it makes that sound I described. Also to note, this sound, and these frequencies, are always active 24/7. If anyone knows about these frequencies, or if anyone can check it out, that would be helpful, im extremly curious.

Depends - where are you ?

As Kevin indicated one possibility is TV14 as 470-512 is known a T-Band

 

[KevinC]

CITS-DT - Wikipedia

en.wikipedia.org

 

[dlwtrunked]

Some HD digital TV ATSC-1 digital stations have/will convert to ATSC-3. ATSC-1 has a pilot carrier (it has no modulation) at 309.441 kHz above their bottom edge. This would put one on 470.309441 MHz (NOTE: That is the nominal pilot frequency and some are intentionally or accidentally offset with there not being a specified tolerance). Note that ATSC-3 has no pilot carrier but will have digital information on that frequency and will sound different. It is likely your local converted from ATSC-1 to ATSC-3 (they are not required to convert but many have/will). Give a nearby city and I could tell you more. How it sounds on different radios is an artifact of their demodulation scheme.

 

[nd5y]

, and whenever you jiggle the anntenna or move the radio like, in big circles, theres like a constant clicking sound.

That's because of the poor receiver design. Do a search for "Baofeng geiger counter sound".

 

[Dimmer_gamer]

Depends - where are you ?

As Kevin indicated one possibility is TV14 as 470-512 is known a T-Band

Near toronto. For me it just doesnt sound like a tv brodcast, but some dead signal just overplaying. Now of course, that could be from a tv14 station.

 

[Dimmer_gamer]

That's because of the poor receiver design. Do a search for "Baofeng geiger counter sound".

Yeah, thats it. I only hear it on those frequencies tho.

 

[Dimmer_gamer]

Depends - where are you ?

As Kevin indicated one possibility is TV14 as 470-512 is known a T-Band

Near toronto.

 

[dlwtrunked]

That's because of the poor receiver design. Do a search for "Baofeng geiger counter sound".

Or squelch setting.

 

[dlwtrunked]

Near toronto. For me it just doesnt sound like a tv brodcast, but some dead signal just overplaying. Now of course, that could be from a tv14 station.

I suspect you do not recognize digital TV sounds like which I am sure it is..

 

[nd5y]

Or squelch setting.

It's not the squelch. It happens with the squelch fully open.
There are some articles by people who determined that the snap-crackle-pop geiger counter noise while moving is caused by AGC settings and initialization settings in the AT1846S chip.

 

[dlwtrunked]

Or squelch setting.

Regarding the down vote, if you adjust the squelch near threshold, you can get something like that on some digital signals. I doubted that was the cause myself but considered it a possibility. The big problem here is a narrow bandwidth receiver defined for audio is going to give odd sounds when looking at a near 6 MHz wide digital TV signal which this certainly is.

 

[Tx4]

Regarding the down vote, if you adjust the squelch near threshold, you can get something like that on some digital signals. I doubted that was the cause myself but considered it a possibility. The big problem here is a narrow bandwidth receiver defined for audio is going to give odd sounds when looking at a near 6 MHz wide digital TV signal which this certainly is.

Your correct they need to monitor the entire 6MHz of RF Channel 14 spectrum to get a real picture of the 470 band. We get a lot of interference on CH15 here in Chicago from all over.

 

[dlwtrunked]

Your correct they need to monitor the entire 6MHz of RF Channel 14 spectrum to get a real picture of the 470 band. ...

Yep.