Going thru a newly acquired junk/spares box I have found a
new/wrapped in plastic Marconi Crystal Oscillator Identity FQ 3121-11. Serial
It is stamped as having a freq of 4960KHz and temp range of -10c to
55c running off 20v AC.
It didn’t come with any wiring diagram, and out of the 8 pin
contacts on the base are 8 leads, red white, 2 x yellow, green, blue and 2 more
The unit sits in a sealed can about the size of a small coke can
and has a control on top which rotates freely thru 360 degree and more.
Jim Moritz has informed me it is an OCXO but does anyone have a
circuit for it or a plan of the leads out. I have googled but to no
I am guessing that there must be some alumni of Marconi out there
and they may know of this widget
With best regards
Dr. James Cowburn
26 Birch Close
T +44 (0) 1767 600522
M+44 (0) 7967 300152
E [email protected]
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