2
$\begingroup$

There are a number of frequencies, where a certain type of signal can be heard. The characteristics is, that every occurrence takes about 2.5k bandwidth, and it is transmitted in a continuous way. Specific is as well, that it looks like a rather broad carrier, and sounds the same in AM or L/USB.

See the following screenshot of a SDR, where you can observer them three times around 8300 khz: SDR Screenshot

An audio example of it is at the following link (WAV, ca. 150k, ca. 5 sec): https://drive.google.com/file/d/0B4ecO4IudzvrOVRUX242MkQtbFU/view?usp=sharing

My question: What is it? As it is constantly transmitted I suspect it could be a weather radar. Can anyone state what it actually is?

| improve this question | |
$\endgroup$
  • 2
    $\begingroup$ Hello, and welcome to ham.stackexchange.com! Please consider taking the tour to get the most from this site. It sounds to me like DRM but it's too narrow to be that. $\endgroup$ – Mike Waters♦ Jul 1 '17 at 18:21
5
$\begingroup$

These are data transmissions using OFDM.

They are government or military point to point data links. I would expect that the data would be encrypted.

| improve this answer | |
$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.