[time-nuts] 5 Mhz NBS Frequency Computers for Sale

paul swed paulswedb at gmail.com
Wed Jan 25 15:52:57 EST 2017

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.

On Wed, Jan 25, 2017 at 2:23 PM, Perry Sandeen via time-nuts <
time-nuts at 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
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