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Hi Neil,If you press the "more" button on the lower right control panel you'll see various AGC parameters that can be adjusted. Changing the Threshold and Slope will effect the gain. There is also a Manual Gain slider that becomes active if you turn the AGC off.There is the volume control of course. There is no hardware gain control in the RF front-end. This was a cost tradeoff.
The other thing you can do to get more printf output from the kiwi server program is to run it from the shell instead of as the usual daemon process. Do a "cdp" to get to the build directory. "mst" to stop the daemon. Then "k" to run directly. Not all the kiwi program printfs go to the syslog file to keep the log size under control.After you're done and control-C to stop the "k" program. Use "msa" to restart the daemon (or "ku" -- kiwi up).
The label system needs a complete overhaul, but that's a separate topic.To do what you need there are a couple of options. If you're running a recent release (we're on v1.10 currently) you can edit the labels directly with the browser UI. See here: http://kiwisdr.com/quickstart/#id-user-markerBut that's kind of cumbersome because you'd have to delete each label, one-at-a-time, from 25 MHz up. Or worse, all of them since none would apply if you only have a transverter connected. So try editing the database file directly. FIrst, login to the Beagle with ssh or PuTTY as root. Type 'cdp' to go the project build directory. 'mst' to stop the server. 'cd ~/kiwi.config'. Make a backup copy: 'cp dx.json dx.json.bak' Then edit the file dx.json using whatever text editor on Debian you can deal with. 'nano' is not too bad. It uses control characters for commands. It has on-screen help. The dx.json file entries are sorted by frequency, so delete the ones you want. Restart the server by doing a 'cdp' and 'ku'.Your idea about adding an offset to the displayed frequencies is a good one and I'll add it to the wish list.