As always, "without degrading the phase noise" is only half of the spec. The other half is "at offsets of X Hz and beyond." What is X? It can make all the difference.
I'd look at using a PLL to lock a 100 MHz VCXO to your 10 MHz source. If you are willing to lock one crystal oscillator to another, the loop bandwidth can be made very low, ruling out any noise degradation at the offsets you're most likely to be interested in. State-of-the-art in low-noise harmonic multiplication seems to be the nonlinear transmission-line multipliers sold by Picosecond Pulse Labs, but they are targeted at GHz-and-up applications. Perhaps there are ways to realize similar structures with varicaps and lumped inductors in the HF-to-lower-VHF region...? -- john, KE5FX > > Hi all, > > > > How difficult is it to multiply a frequency standard from 10MHz > to 100MHz? > > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts