HFU HF Underground

Loggings => HF Mystery Signals => Topic started by: Skipmuck on July 29, 2017, 2322 UTC

Title: UNID Buzzer 5089.8ish 2302 UTC 29 July 2017
Post by: Skipmuck on July 29, 2017, 2322 UTC

I'm hearing an intermittant buzzing sound of about 5 seconds in duration repeated several times, off, the back on again after a few minutes. Interesting easypal waterfall image. 5 seconds duration then repeated after 5 seconds



(http://i.imgur.com/nYwWD3W.jpg)

Title: Re: UNID Buzzer 5089.8ish 2302 UTC July 29, 2017
Post by: Token on July 30, 2017, 0522 UTC

Skip, I am pretty sure this was Arecibo in a radar mode of operation, centered on 5100 kHz.  20 kHz wide bursts of 200 Hz rep rate FMCW.  Later they went to 2 minutes on / 2 minutes off on 5100 kHz.  And later yet (0500z) they went to stepping tones.

T!

Title: Re: UNID Buzzer 5089.8ish 2302 UTC July 29, 2017
Post by: Skipmuck on July 30, 2017, 1120 UTC

Interesting indeed Token! The carrier I had on 5089.8 when the Buzzer was off may have been unrelated. I wish they would transmit an EasyPal image for us!  :)

Title: Re: UNID Buzzer 5089.8ish 2302 UTC July 29, 2017
Post by: Token on July 30, 2017, 1309 UTC

No, the 5089.8 kHz carrier was probably related.  When they were FMCW that carrier was gone, it only appeared during rest times between bursts of FMCW.

T!