Martyn Smith wrote: > Garry, > > Are you also saying your 100 MHz OXCO is making -178 dBc/Hz? > > Unless your 100 MHz OXCO is some special $10k type, there's no way your > OXCO > has a -178 dBc/Hz floor noise? > > Regards > > Martyn
Can you explain this further? It isn't clear to me that there is any fundamental reason why this noise floor is not possible, especially if other specs (like aging) can be relaxed. Also, the noise floor tends to be limited by issues having to do with physics, not economics. How would having $10,000 to spend get around the physics issues? I think I could approach this noise floor by taking a 10811 and bringing the signal directly out of the grounded base buffer, and then readjusting the ALC to double or triple the crystal current. The biggest unknown is at what point the crystal sustains damage. The 10811 is definitely not optimized for phase noise floor. The designers were well aware of this. But phase noise floor isn't everything. Rick Karlquist N6RK _______________________________________________ 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.