Unfortunately, experience is a lantern lighting the way already done... and it takes months to forge a good sword: no one should break any sword.
On Fri, Nov 9, 2012 at 10:53 PM, Chris Howard <ch...@elfpen.com> wrote: > > My perpetually drifting 10811 pretty quickly made it to the negative > voltage rail on the control voltage. > > I was looking at the oscillator output with an O-scope and it looked > pretty nasty. My equipment is not so hot, so I first chalked that > up to bad probes. But I did some google work on that and found an > old time-nuts message thread about the 10811 looking bad if the > output impedance is bad. > > The VE2ZAZ board has provision for a 50 ohm resistor on the oscillator > output. I have one on the board but it is a little-bitty thing, > maybe 1/8th of a watt? Something I probably got from the guts of a VCR > or whatnot. Hmm. So I put in a 1/4 watt 50 ohm resistor (like > the parts list called for). My working hypothesis is that the small > resistor was changing impedance due to heat. > > I have reset the control voltage to center value and got the coarse > trimmer all beautifully centered. It's been running for about a day > and I am hopeful that I've made a difference. So far so good. > > While I was interrupting the flow of 10 Mhz, I also mapped out the > control voltage and corresponding digital control value and an > approximate frequency. > > You EE guys are probably snickering and will want to > tear the epaulettes off my time-nuts coat and break my sword. > What can I say. > > > > > _______________________________________________ > 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. > _______________________________________________ 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.