25 Sep
2005
25 Sep
'05
12:14 p.m.
El sáb, 24-09-2005 a las 20:12, fons adriaensen escribió:
[snip]
A very accurate reference frequency can be obtained form e.g. the BBC
radio transmitter on 198 kHz, and this can be received over a large
part of Europe (no idea where you are...). Use a simple PLL chip to
receive it, divide the oscillator frequency by 32 and input as audio.
Most regions have similar reference transmitters available.
Another option is to use the mains frequency as a reference. This
is maintained to very high long term accurary (as many clocks depend
on it), but its short term precision could be bad.
Very interesting project. What about using some external signal
generator? As you need only one signal, I think there must be something
accurate enough for doing this (I mean, not a multi-frecuency signal
generator). Perhaps a professional tunner? I've heard that some of them
have compensation for temperature, for example.
Anyway, I'm gonna ask some friends about this.
Please, keep us up-to-date with this project.
Cheers, Damian.-
"Any sufficiently advanced technology is indistinguishable from magic"
Arthur C. Clarke