[time-nuts] Interesting paper on GPSDO performance

[John Ackermann N8UR]

While googling around during lunch today, I came across this interesting 
2005 paper from NIST by Michael Lombardi et al comparing the performance 
of four commercial GPSDO:

http://www.dtic.mil%2Fcgibin%2FGetTRDoc%3FLocation%3DU2%26doc%3DGetTRDoc.pdf%26AD%3DADA484160&ei=W3TvTovSHMT42QX1_YDcBQusg=AFQjCNG7nhqXkGHhZ5ojqNaiMDwRH10TLg

(that's a horrible URL -- this is easier: http://bit.ly/vv141K )

The paper doesn't identify the manufacturer or model of the four 
devices, but I'm pretty sure unit "A" is a Z3801A.  I haven't had a 
chance to compare specs to see if B, C, and D can be identified.

John