[time-nuts] Question on disciplining oscillators

[SAIDJACK at aol.com]

Hello James,
 
I noticed that the M12+ has a significant temperature sensitivity,  
especially when air is flowing over the TCXO. Try blowing air onto the TCXO, I  have 
seen the 1PPS immediatly wander off by much more than 50ns before the M12+  
shuts-off the 1PPS output.
 
Maybe you are seing the M12+ react to environmental effects?
 
After all, the M12+ itself only disciplines its internal (cheap) TCXO to  the 
GPS signal, and is thus itself a slave to the TCXO sensitivities.
 
I wonder how much better the M12+ would be if the internal TCXO is replaced  
by an external high-quality OCXO...
 
bye,
Said