Poul-Henning, Do you need 16 bits or can you get by with a 12 bit ADC?
Have you considered using an FPGA for signal processing? It seems you need a fairly serious CPU to handle that much data. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -----Original Message----- From: "Poul-Henning Kamp" <[email protected]> Sender: [email protected] Date: Wed, 14 Mar 2012 22:16:38 To: Discussion of precise time and frequency measurement<[email protected]> Reply-To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] WWVB BPSK Receiver Project? In message <[email protected]>, Brooke Clarke writes: >I sure would like a WWVB BPSK receiver for the new modulation. I've been playing with SDR and VLF signals for ages. What you want is an antenna, a 1MSPS ADC and a fast-ish CPU. One very interesting thing you can do with that, is to make a buffer 1000 samples long, and continously average the received signal into it, round-robin format. That amounts to a comb-filter for every n*1kHz signal, and a trivial sin/cos multiplicator will give you the phase and amplitude of every single radiotransmitter on n*1kHz up to your antialias filter at the same time. If you have CPU power, you can also receive Loran-C by making the buffer GRI*10 (or *20, if you want the code) samples long. I've long thought about building a board with one of the faster ARM CPUs and a 1MSPS 16bit ADC for this, but nobody else seemed interested, so I've just used my hacked up rig. -- 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 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.
