It has been present since the transponder's activation. I believe it is possibly some sort of image of the data downlink leaking through to the transponder passband.
It is definitely internally generated.
On Wed, Mar 27, 2019 at 9:28 AM Chuck Swiger [email protected] wrote:
Hi - can anyone identify this signal often heard on the XW-2 birds?
I enjoy listening to the SSB qso's on them, but curious what that is, sounds almost like a very slow fax like https://www.sigidwiki.com/wiki/WEFAX
One was particularly strong this morning https://network.satnogs.org/observations/555759/ (the line around +15KHz on the waterfall) along with another weaker one.
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