Hello, Thank you for accepting me in this mailing list, the exchanges are of quality and are agradable to read . English is not my mother tongue and I have a lot neglected these courses at university, but I will try to be as understandable as possible.
To start I congratulate you on WSJT-X, I am a developer myself and I am admiring the work done (for my career see here: https://en.linkedin.com/in/david-alloza-6689295/en) I have a question about the SNR calculation performed in the JT9 and JT65 modes of WSJT-X. I looked at the source code, but I fail to identify the part that answers my questions. I would like to know how you evaluate the noise level used for the SNR calculation, it seems to me that there are two ways to do it: 1> You take the average spectral power present in the spectrum received (on 2.4Khz bandwidth) , and you compare to the power of the station received. It's simple, but the presence of several powerful stations will change the result. 2> or you are trying to evaluate the background noise level in the spectrum of 2.4Khz by hide the influence of the stations received, and in this case how is this evaluation done? If you do not have to spend time detailing the answer, you could just tell me where the calculation is done in the source code and I would understand how it works. Last question, why in JT65 the strongest SNR is a -1 then they can be positive in JT9 or WSPR? Thank you for reading this message, My 73, David, F4HTQ. PS: This is independent of my questions, but I run WSJT-X on portable station with a homemade "digital mode optimized" Tx. You can read my qrz page for details : https://www.qrz.com/db/F4HTQ ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ wsjt-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/wsjt-devel
