-------- Bob kb8tq writes: > Common wisdom is that there is a filter in the cavity match that > is specific to 60 MHz. Putting in 120 MHz apparently does not work > well. I haven’t tried it so I’m just passing on what I’ve heard.
Driving step-diodes is a bit of an art, and the relationship between driving frequency, AC power and DC bias is very far from trivial, as the "real" parameter, if I have understood it right, is the slew-rate through the "magic" voltage. > The “other” signal (normally 5.3x MHz) is mixed with the multiplied 60 MHz. As far as I have been able to make out, both the 137Hz and 5.3x MHz are "mixed" through their amplitude modulation of the DC-bias. My Personal DDS plan is to simply drive the step diode at 59.953... MHz +/- the modulation pattern, and forget entirely about the 5.3x MHz and 137 Hz. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | 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 -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
