-------- In message <am0pr03mb4129fbd0922805fc14b8cefde4...@am0pr03mb4129.eurprd03.prod.outlook.com>, "John Moran, Scawby Design" writes:
>However, fast A-Ds are not particularly cheap and you would need >circa 50MHz sample rate to resolve 1deg of the carrier, and TVB has >already stated that there are no time benefits to BPSK, so this is >all just an interesting technical exercise, isn't it? I admit it would be interesting to do the allan variance on it, but measuring the carrier to 1 degree in every single cycle is waaaaay overkill. 1 MHz sampling rate is fine, but go for 5 or 10 MHz so you can drive the ADC directly from your house-standard. And BPSK *does* improve the timing, because you can very precisely measure when the change of phase happens, and it since it happens at a carrier zero-crossing you can filter it down to +/- sample. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [email protected] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
