HFU HF Underground

Loggings => Utility => Topic started by: turbocode on February 01, 2021, 2116 UTC

Title: reading of nato alphabet and numbers
Post by: turbocode on February 01, 2021, 2116 UTC

8.992 MHz.  Lots of echo I am presuming from ionospheric ducting.

English words reading letters and numbers.

21.15 zulu.

Mid atlantic usa.

Title: Re: reading of nato alphabet and numbers
Post by: MDK2 on February 01, 2021, 2201 UTC

That's the US Air Force's HFGCS system, which is on multiple frequencies. You'll see them called "emergency action messages" (EAM's) but I think the prevailing opinion is that they're mostly exercises. You can learn more about it, including all the frequencies used, at the link. Whenever you hear one, it's worth checking the other frequencies to see which one is strongest at your QTH, keeping in mind that the highest ones are daytime only and the lowest nighttime, but those in the middle are both.

https://en.wikipedia.org/wiki/High_Frequency_Global_Communications_System