HFU HF Underground

Loggings => HF Mystery Signals => Topic started by: alleycat on March 14, 2021, 0207 UTC

Title: 7040 kHz - 5 second bursts, 150 kHz bandwidth
Post by: alleycat on March 14, 2021, 0207 UTC

I'm familiar with most common amateur digital modes, but tonight I'm hearing (a new?) one on 40m from several stations that doesn't appear to be represented at SigIdWiki. Audio at https://www.lutins.org/temp/7042.mp3 (https://www.lutins.org/temp/7042.mp3); waterfall thus: (https://www.lutins.org/temp/7042.jpg)

Title: Re: 7040 kHz - 5 second bursts, 150 kHz bandwidth
Post by: refmo on March 14, 2021, 1703 UTC

That is the fairly normal PSK-63 digital mode (maybe slightly over-driven).  7040 khz is the standard 40m frequency for these in IARU Region 1.

Here is the decoded text from your audio recording....
CQ EA TEST EA6SX EA6SX EA6SX
-
CQ EA TEST EA6SX EA6SX EA6SX
-
CQ EA TEST EA6SX EA6SX EA6SX

Title: Re: 7040 kHz - 5 second bursts, 150 kHz bandwidth
Post by: alleycat on March 14, 2021, 2058 UTC

Excellent! Not sure how that one got by me, as it's not all that new. I've used several applications that support that mode, so I'll have to give it a try. Thanks!