Esa Heikkinen wrote: >> New 10544A's have a somewhat cleaner output than that. >> Perhaps something is wrong with the emitter follower. >> > > Sorry I forgot to say that the oscilloscope picture was taken directly > from HP10544A output, without emitter follower but with 1:1 probe, > output terminated with 1 kohm. resistor. With spectrum analyzer the > emitter follower is necessary due to 50 ohm. input impedance of the > analyzer. > > Datasheet of HP10544A claims that harmonics should be more than 25 dB > down. Doesn't look like they are. > > Here's a spectrum measured from OCXO which is used in the Thunderbolt. > I'm not an crystal oscillator guru but I think that this is just what an > xtal oscillator output should be: > > http://www.amigazone.fi/files/gpsdo/tbolt-1.png > http://www.amigazone.fi/files/gpsdo/tbolt-2.png > > Esa
Please provide a circuit schematic for your emitter follower buffer. Include transistor types and component values as well as power supply voltages. Bruce _______________________________________________ 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.