HFU HF Underground

Loggings => HF Beacons => Topic started by: zeak on March 23, 2021, 0427 UTC

Title: 4107.83 and 4109.02kHz Beacons?
Post by: zeak on March 23, 2021, 0427 UTC

Anyone familiar with the following two beacons:

1) 4107.83 CW a ditter but with an off cadence keying at ~1 sec intervals? Heard at 0350Z 579 at DM12. Signal’s azimuth orientation generally NNE. No ID.

2) 4109.02 CW at 0353Z, similar to 4107.83 with the cadence thing, but difficult to tell with QRN. Dits also  ~ 1 sec interval. 549-569,  QSB  at this location. Azimuth orientation difficult to pinpoint with QRN. No ID.

Primary intercept with 1m loop, dipole not as good copy on dipole, with much more atmospheric noise (QRN).

Receiver KiwiSDR
Antennas: 1m Loop and 80m dipole at 15m
 location:  DM12

Title: Re: 4107.83 and 4109.02kHz Beacons?
Post by: ChrisSmolinski on March 23, 2021, 1122 UTC

I see two LINK-11 transmissions around this area, perhaps that is what you are hearing?

(https://i.imgur.com/nDbaX59.png)

Title: Re: 4107.83 and 4109.02kHz Beacons?
Post by: zeak on March 23, 2021, 1458 UTC

Yes, looks like that’s certainly Link-22. What I’m hearing/seeing on the west coast is merely the energy in the sidebands rather than any of the spectra between the sidebands.

Thanks!!

Title: Re: 4107.83 and 4109.02kHz Beacons?
Post by: ~SIGINT~ on March 24, 2021, 0000 UTC

Give 8144.5 kHz in DSB mode a try and you will have a similar signal. Depending on the propagation it may be a better target to intercept. I logged this one on 2021-03-08 at 18:21 UTC. What was interesting is that both carriers were in sync with each other and the signal level was the same which leads me to believe it originated from the same transmitter.

(http://www.milspec.ca/board/img/2021-03-08_132117.png)

Richard

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RSPduo | Barker & Williamson antenna | Toronto, Ontario Canada