Search found 3 matches

by LuYfbHEe
Tue Jul 28, 2020 9:21 pm
Forum: KerberosSDR
Topic: Frequent frequency shifts and syncing
Replies: 3
Views: 652

Re: Frequent frequency shifts and syncing

I change frequencies, and thus set sampling delays, every 20 seconds, and recalibrate every 5 minutes. There are basically three scenarios: 1) accumulated delay is less than negative BUFFER_SIZE (fails) 2) accumulated delay value value exceeds BUFFER SIZE (fails) or 3) neither 1 or 2 (successful). P...
by LuYfbHEe
Mon Jul 27, 2020 7:29 pm
Forum: KerberosSDR
Topic: IQ calibration
Replies: 1
Views: 347

IQ calibration

Examining the code, I've understood it, except for the IQ correction. The math behind the calibration eludes me - it does not look like IQ calibration I'm familiar with. Could someone explain this method to me?
by LuYfbHEe
Mon Jul 27, 2020 7:26 pm
Forum: KerberosSDR
Topic: Frequent frequency shifts and syncing
Replies: 3
Views: 652

Frequent frequency shifts and syncing

I have a project that requires frequency changes every measurement. Since this needs a new calibration for each frequency, I made automated calibration boards controlled by the GPIO of the Raspberry Pi - so I can get new delay values for each frequency and then use those values for each frequency. T...