[time-nuts] About HP10544A

[Bruce Griffiths]

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