HP 106B Quartz Frequency Standard?

[Lee Davison]

> I can't find this in any of the catalogs that I have. Can anyone tell
> me anything about it?

A heated XTAL oscillator used to derive 5MHz, 1MHz and 100KHz reference
outputs. Short term stability is probably around 1 part in 10^11 with
long term stability an order worse.

Units like this are often used as the master reference at HF, MF and LF
transmitter sites and should be calibrated periodically against a better
reference like a Rubidium standard.

Without calibration this is just as accurate as any XTAL source as the
frequency can usually be adjusted over 1 part in 10^7 and have a fine
tune (which if I remember the HP unit is a voltage input) that has a
range of 1 part in 10^8

Lee.