What is this burst emission on shortwave?

Use this forum to share your logs, your DX, and any broadcasts or signals of interest. If you're trying to identify something you've heard on shortwave, this is a great place to start!
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emilio
Posts: 4
Joined: Sat May 28, 2022 4:56 am

What is this burst emission on shortwave?

Post by emilio »

Hi

I like experiment building my own radios: crystal sets, regeneratives with transistors and tubes, etc. Some months ago made a crystal radio with double tunning circuit:

Image

This night i forgot turn off the audio amplifier (the box with zeppellin pictures), and wake up with the strong sound of Burst emission, not is the first time im hearing this kind of sound in my SWLing activities but i dont know what it is, could you tell me about it? Here is my audio record file (Warning: Its a burst sounds so be carefull with speaker vol )

https://sbj.edu.mx/crystal-receiver/sho ... -radio.mp3

I think the frequency is about 5 or 6 mhz, my antenna is a long wire about 20 meters at 10 meters tall with earth conection.

My grid locator is: EK36kp
Baby don't Hertzme no Morse
http://emilio.sdf.org
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Andrew (grayhat)
Posts: 210
Joined: Sat May 28, 2022 5:56 am
Location: JN63pn

Re: What is this burst emission on shortwave?

Post by Andrew (grayhat) »

emilio wrote: Sat Oct 01, 2022 9:39 am Hi

I like experiment building my own radios: crystal sets, regeneratives with transistors and tubes, etc. Some months ago made a crystal radio with double tunning circuit:

Image

This night i forgot turn off the audio amplifier (the box with zeppellin pictures), and wake up with the strong sound of Burst emission, not is the first time im hearing this kind of sound in my SWLing activities but i dont know what it is, could you tell me about it? Here is my audio record file (Warning: Its a burst sounds so be carefull with speaker vol )

https://sbj.edu.mx/crystal-receiver/sho ... -radio.mp3

I think the frequency is about 5 or 6 mhz, my antenna is a long wire about 20 meters at 10 meters tall with earth conection.

My grid locator is: EK36kp
just a shoot in the dark, but it could be an OTH radar
13dka
Posts: 98
Joined: Sat May 28, 2022 4:27 am
Location: On or near a dike

Re: What is this burst emission on shortwave?

Post by 13dka »

To me that sounds a lot what some kind of FSK/FDM simplex comms would sound like on AM, has similarities to POCSAG..
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