In message <[EMAIL PROTECTED]>, Soren Kristensen writes: >Hi David, > >Bob Camp wrote: >> Hi >> >> The ideal OCXO would be one at 33.333333 MHz. I suspect you will have >> a hard time finding one, short of a special order build. That's going >> to take time and cost money (trust me on that ...). >> >> A reasonable alternative is to grab what ever frequency you have and >> use a clock multiplier / divider (like an ICS 525). > >You can also use another frequency as the 33.333 Mhz is only used for >the CPU clock, so t.ex. 32.768 Mhz, 32 Mhz, 30 Mhz or even 25 Mhz could >be used as it don't seems like CPU performance is of big concern....
For reasons of dither, which I don't have time to explain fully right now, it is actually best if the frequency is not divisible by 4 Hz and even better if it is not divisible by 1Hz. Detuning an OCXO a bit from the ideal helps, but it is not as good as an "odd-ball" frequency. -- 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. _______________________________________________ Soekris-tech mailing list [email protected] http://lists.soekris.com/mailman/listinfo/soekris-tech
