Dear LF,
Going thru a newly acquired junk/spares box I have found a
new/wrapped in plastic Marconi Crystal Oscillator Identity FQ 3121-11. Serial
no. 118941.
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
yellow.
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
avail.
I am guessing that there must be some alumni of Marconi out there
and they may know of this widget
With best regards
Jim
Dr. James Cowburn
26 Birch Close
Broom
Biggleswade
Beds
SG18 9NR
T +44 (0) 1767 600522
M+44 (0) 7967 300152
E [email protected]
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