Hi Jim, On 03/31/2017 01:07 AM, jimlux wrote:
BTW a lot of GPS receivers don't have a "first LO".. they are more like a Tuned RF receiver - an input BPF for L1, L2, or L5, then direct sampling at around 30-40 MHz - something that makes the GPS signals alias down somewhere convenient (and always have positive frequency offset from zero, even at max negative Doppler)
Still fills the function of LO, as the sample and hold operates as a mixer and the fold-down can be seen as an overtone mix followed by a sampling of the mix product, so well, it's about the same thing.
Cheers, Magnus _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
