Hi I suspect that encoding 10 bits via AM PWM is likely to be a bit exciting from a signal to noise standpoint on the receiving end. Back in the good old days a 1/3 2/3 width switch was a normal way to encode a single bit.
Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Clayton G Sent: Tuesday, June 26, 2012 9:16 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Encoded 1PPS signals Hi Nuts, I have been building an LF transmitter, and have provision for a 1PPS input for calibration purposes. However I would like to be able to provide more time information than just the second pulses. It occurs to me that full time info could be encoded onto a 1PPS stream by changing the width of the pulse itself. The rising edge can be left unchanged to indicate the precise second, but the trailing edge can vary between (say) 100mSec and 300mSec, and this could encode 60 bits (with suitable idle pulses etc for synchronisation) in each minute. Using this I could encode full date and time into the 1PPS stream. My question is, does such a standard already exist, or has anyone developed something along this line? If no, I plan to implement something suitable myself, and will publish it should it be useful to others. Regards Clayton (VK1TKA) _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
