Hi David and list, Am I correct in understanding that the fft in fdmdv.c when used to modulate, creates both real and imaginary, but that the file output ONLY uses the real component?
If that is correct, would the imaginary component be the "Q" channel, and if that was output, I could drive the I input of a simple SDR radio and Q with the imag I could generate a "SSB" copy of the modem output. I am aiming at something extremely simple that could be used with crystal or a signal generator to create a test signal. This would make it easier to test the whole, without creating a lot of QRM, just feed the I + Q from the PC sound card to two sampling mixers. There are *many* such SDR TX designs on the net. Even simpler: Feed the existing FDMDV modulating signal to the IF port of a DBM, and a suitable RF signal to the RF port. This will create two copies of the signal, (DSB) where one is "mirrored", but a SSB rig will only care about one sideband. Just some thoughts on testing.. Regards, SM6FBD / Gullik P.S. The same discussion could be about receiving... ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
