HFU HF Underground

Loggings => Other => Topic started by: Exo on January 25, 2019, 2231 UTC

Title: 10500kHz Ditter Hopper 2019JAN25 2145UTC
Post by: Exo on January 25, 2019, 2231 UTC
Ditter hopper.
When the logged frequencies are monitored simultaneously on separate receivers or instances, it is observed hopping repetitively from one freq to the next higher frequency in sequence.

Depending on which frequency or time interval is listened to, it sounds like either continuous dits, or groups of 3 dits.
First was logged on 14350 kHz around 1940UTC, and then a closer look at it yielded other companion signals at around 2145UTC.

2019JAN25 2153 UTC

10150.0 kHz CW, frequency hopping, good readable, -112 dBm
10500.0 kHz CW, frequency hopping, good readable, -110 dBm
14350.0 kHz CW, frequency hopping, readable, -120 dBm
Timing Notes:
Pattern on 14350 kHz. approximately 28 millisecond dit duration, 3 dits at 1.411 second repetition rate, 9.4 second pause.

Note: noise level in 3 kHz bandwidth approximately -130 dBm.

2019JAN25 2200 UTC
Signal ceased on all logged frequencies simultaneously at the top of the hour.

Frequencies logged are noted to be in standard increments of kHz, and sequential hop activity is similar to the operational pattern of the Son of Yosemite Sam hopper from November 2018. (https://www.hfunderground.com/board/index.php/topic,48485.msg175425.html#msg175425)

The 9 second cycle is similar to Son of Yosemite Sam (https://www.hfunderground.com/board/index.php/topic,48485.msg175142.html#msg175142).

PLAY AUDIO RECORDING 14350kHz Ditter Hopper 2019JAN25 2153UTC (http://hfpack.com/members/exo/14350kHz_DitterHopper_2019JAN25_2153UTC.mp3)

Wild guess: It is a low power frequency hopping antenna system being tested, probably located somewhere in southwestern USA.