[time-nuts] HP OCXO's 10544A and 10811A

[Tom Van Baak]

> is there a comparison of the key characteristics of these two sub-assembles?

The newer 10811 works in older 10544 instruments but not the other way 
around; the reason is the additional power supply requirements of the 
10544. See the data sheets for the 10544 and 10811:

http://leapsecond.com/museum/10544/1972-Oct-hp-10544A.pdf

http://leapsecond.com/museum/10811a/10811a.pdf

Also the 10544 output is spec'd for 1 Vrms into 1000R load; the 10811 is 
0.5 V into 50R load.

There are differences about warmup time (AT- vs SC-cut). That's 
important for a often turned-on/off bench instrument; but less important 
if the oscillator is used as a never-turned-off frequency standard.

More info, including data sheets, schematics, and an excellent set of 
papers by fellow time-nut Charles:

http://leapsecond.com/museum/10544/

/tvb