On 24/04/14 23:30, Bob Camp wrote: > There is no difference at all between a 32 pf series crystal and a 32 > pf parallel crystal. They both resonate with a 32 pf load and operate > at exactly the same frequency into that load. Your crystals will work > fine with that circuit.
That's good to know. I'm actually testing with one of these crystals: http://uk.farnell.com/multicomp/hc49u-10-20-50-60-30-atf/crystal-hc-49-u-10-0mhz/dp/1666972 On the basis that they're cheap and I don't want to ruin one of my OCXO crystals. Said OCXO crystals came from QuartSLab, with the following specification: Crystal Frequency: 10.00000 MHz, Fundamental Mode Holder Type: HC-49/U Circuit Conditions: Parallel Resonant Load Capacitance: 33 pF Oven Temperature: 50 Celsius Those things cost £17 each and had a 20-day lead time last time I bought one, so I'm keen to avoid damaging them! They're probably not fantastic compared to a 10811's SC-cut part, but this is only intended to be a learning experience. I'd consider it "good enough" if it could hold its own against my LPRO. The invoice calls them out as "10.00000 HC49 S03F1" -- I'm honestly not certain what "S03F1" indicates. > The big claim to fame of the circuit shown is that you can get a nice > looking sine wave out of it at a pretty big peak to peak voltage. > It’s not bad for phase noise, but it’s also not the “super quiet” > that you would expect if you paid kilo bucks for a Wenzel OCXO. I'll probably be mating it to a 50-ohm driver of some description, then. That's a job for later, I need to make the oscillator work first :) For now I just need to keep it under +24dBm into 50R (limit of my spectrum analyser), preferably less than +13dBm (1V over 50R). Thanks, -- Phil. li...@philpem.me.uk http://www.philpem.me.uk/ _______________________________________________ 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.