skywatch1234
Newbie
- Joined
- Jun 25, 2020
- Messages
- 2
Hello,
I was playing with a HackRF 1 and CubeSDR on Linux to view the RF spectrum. The HackRF goes to max 5Ghz and I noticed some streams in the range of 3 GHz - 5 GHz.
There are several dozens of these very thin lines in the waterfall at misc frequencies in the 3,4,5 GHz range. They are around 250-300 Hz wide and when made audible only resulting in a perfect sine. All these ultra thin lines in the mentioned range have the same characteristic. Some higher some lower though the amplitude (signal strength) varies. These signals always broadcasting and varying between a perfect sine (mono tone) to (on some days) an oscillating sine (looks like a "standing wave" visually, sounds like a sine tone in pitch modulation).
No other signals carried or modulated over these signals.
I know this range is used for sat comms and I sometimes see some sat data in the range, with the usual sound (when made audible) of digital communications) so I know these are not the typical sat coms. They are not only in my vicinity so they must be commonly known signals.
Can anyone please give me a hint on what I'm looking at?
skywatch
I was playing with a HackRF 1 and CubeSDR on Linux to view the RF spectrum. The HackRF goes to max 5Ghz and I noticed some streams in the range of 3 GHz - 5 GHz.
There are several dozens of these very thin lines in the waterfall at misc frequencies in the 3,4,5 GHz range. They are around 250-300 Hz wide and when made audible only resulting in a perfect sine. All these ultra thin lines in the mentioned range have the same characteristic. Some higher some lower though the amplitude (signal strength) varies. These signals always broadcasting and varying between a perfect sine (mono tone) to (on some days) an oscillating sine (looks like a "standing wave" visually, sounds like a sine tone in pitch modulation).
No other signals carried or modulated over these signals.
I know this range is used for sat comms and I sometimes see some sat data in the range, with the usual sound (when made audible) of digital communications) so I know these are not the typical sat coms. They are not only in my vicinity so they must be commonly known signals.
Can anyone please give me a hint on what I'm looking at?
skywatch