For under $20 you can get a OCXO with Si5351A multi output oscillator chip from QRP-Labs.
http://www.qrp-labs.com/ocxokit.html No idea just how good it is but this link gives insight into how it was developed. Designed for WSPR radio transmissions. GPS discipline can be added. http://www.hanssummers.com/ocxosynth Cheers, Will On 06/08/2017 06:10 AM, Chris Albertson wrote: <snip> > IT turrets out that you see MUCH more interesting designs when you lower > the budget. Anyone can make a high performance system even enough money. > They waste half the cost on useless stuff and the product costs double what > it should and is over complex but is works real, really well. That's > easy. Harder and more interesting is "Can you make something just as good > at 1/2 the price?" Answer is usually Yes. Then you say "what much do you > loose if I set the price to 1/4? The answer is surprisingly little if you > get smart about sourcing parts. Turns out about $180 is the minimum > for pretty decent quality HiFi vacuum tube. > > An interesting graph would be Oven Specification vs. Price. What is the > minimum cost for keeping temperature to within 1.0 C, for 0.1C, 0.01 C? > Can you do 1.0C for under $5? or 0.1C for under $10. I bet yes. > > I did an exercise a while back to see what is the minimum price and > complexity to build a GPSDO that was good enough only to drive the lab > bench instruments I have. I implements only 1/2 od Lars W's design and > cut his lines of code by about 90%. Turns outhe cost is the XO and about > $10. Compared to my Thunderbolt, performance was not nearly as good but > the ratio of performance over parts cost might be better. > > > _______________________________________________ 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.