Alarm and strange sound appear at the same time on shortwave!

2 classical shortwave strange sound came out at the same time. One is alarm and for another one, I remenber when I was a kid, there was this kind of sound existing. The latter one was even on amatuer frequency. And both of them at this time are with strong signal(most of the time not so strong). Whoever can tell where it came from and for what?
QTH: Southwest of China

Category:

Travel & Events

Tags:

• Alarm
• strange
• sound
• shortwave
• scary

[senderjaeger]

The "alarm" noise on 15260 kHz is jamming (some country tries to block a foreign broadcast that it doesn't want to be received by its citizens). The second noise sounds like some kind of digital communication on the 20 m amateur radio band.

[superarticulation]

@senderjaeger Thanks for reply in my channel. I bought a Satellit 750 and listen shortwave everyday. The alarm appears on 7520KHz before UTC 15:00 quite often. As for the 2nd sound, is there some kind of software decrypt it?

[SWL1409]

It could be SSTV but I have never hear that noise on 15260kHz.

[superarticulation]

@SWL1409 As for 15260 noise. It came out at any frequence and even 20 years ago I could receive it. 15260 is the highest frequency I found it came out. Usually it appears below 10000KHz, and shows quite far from me.

Regard from China.

[fancysnake1]

it sounds like a weather radio

[MattExzy]

YES. It's the WEIRD ALARM NOISE :O