List, I'm culling my too extensive test equipment inventory. I have two NBS System 358 Frequency Measurement Computers for sale It works like this:  You have a 5 MHz "A" input for your standard and a 5 MHz "B" input for the DUT. The computer has a "B" offset output that multiplies the error to 3000 x 10^ -11. The person who acquired them from NBS surplus sale was the late Clyde Still of Colorado Springs CO who ran a local frequency calibration and measuring service on the side as he was a shift transmitter engineer for a local TV station on top of Pikes Peak. I acquired them from a third party. They were originally sold at the NBS excess inventory sale in Ft. Collins, CO as working units, but I haven't had the round-to-it's to use them. The PS has a number of small electrolytic caps that should probably we replaced before using. I have no schematics or data for them. They measure about 12 inches long by 9 1/2 inches wide and 2 1/2 inches thick and weigh about 6 pounds each. Asking $70 each PLUS shipping from 92220 or $120 for both plus shipping. Please contact me off list. Regards, Perrier

Perry, I remember those. NBS actually sold them to cal labs. The Navy had one at the Oakland Ca Naval Air station and they used them to set the AN/URQ10 frequency reference we used on the ship. There you go 1970s technology. Regards Paul WB8TSL On Wed, Jan 25, 2017 at 2:23 PM, Perry Sandeen via time-nuts < time-nuts@febo.com> wrote: > List, > I'm culling my too extensive test equipment inventory. > I have two NBS System 358 Frequency Measurement Computers for sale > It works like this: You have a 5 MHz "A" input for your standard and a 5 > MHz "B" input for the DUT. > The computer has a "B" offset output that multiplies the error to 3000 x > 10^ -11. > The person who acquired them from NBS surplus sale was the late Clyde > Still of Colorado Springs CO who ran a local frequency calibration and > measuring service on the side as he was a shift transmitter engineer for a > local TV station on top of Pikes Peak. > I acquired them from a third party. They were originally sold at the NBS > excess inventory sale in Ft. Collins, CO as working units, but I haven't > had the round-to-it's to use them. > The PS has a number of small electrolytic caps that should probably we > replaced before using. I have no schematics or data for them. > They measure about 12 inches long by 9 1/2 inches wide and 2 1/2 inches > thick and weigh about 6 pounds each. > Asking $70 each PLUS shipping from 92220 or $120 for both plus shipping. > Please contact me off list. > Regards, > Perrier > > > _______________________________________________ > 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. >