OS2/ll
OS2/l2
OS2/l2E
OS2/l2J
OS2/12K
OS2/12L,12M
OS2/13
OS2/l4
OS2/l5
OS2/16
OS2/l7
OS2/18A
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OS2
Crystal Oscillator used in FM translators and RC5/2 and
RC5/3. Suffixes A and B indicate single frequency below
and above frequency respectively, and suffixes C and D
indicate three frequencies below and above signal
frequency respectively. Superseded by OS2/12 for single
frequency. DD 1960. DD Spec 5.53. OBSOLESCENT.
Crystal Oscillator used in translator equipment and as a
replacement for OS2/11. 78MHz-95MH or 95MHz-llOMHz.
Similar electrically to OS2/20 but different mechanically.
Box 83mm x 63mm x 29mm. DD 1962. DD Spec 5.67. ACO.
OBSOLESCENT.
As OS2/l2 but with a single coaxial outlet instead of 3
and output impedance of 750 instead of 500. DD 1962.
DD Spec 5.67. OBSOLESCENT.
As OS2/l2E but with an additional output on an extra tag
for use in EP7/505, EP7/506, so that the output is under
the unit instead of on top. DD 1965. DD Spec 5.67.
OBSOLESCENT.
Similar to OS2/12J but without
EP7/506 where reduced accuracy is
DD Spec 5.67. OBSOLESCENT.
thermistor for use on
acceptable. DD 1966.
As OS2/l2K and OS2/12J
earthed supply. DD 1966.
bur for negative
OBSOLESCENT.
respectively
DD Spec 5.67.
Part of OSl/l.
giving 60Hz
DD Spec 3.383.
Consists of two transistor oscillators
and 900Hz output. CHl/18C. DD 1962.
ACO. OBSOLESCENT.
Part of OSl/l. Similar to OS2/13 but giving 5kHz and
10kHz
output.
DD 1962.
DD Spec 3.384.
ACO.
OBSOLESCENT.
Supplies line up and general test tone at 900Hz and OdB
voltage level from low impedance source. CH1/18A. Power
supply from PS2/9 at 24V. DD 1962. DD Spec 3.357. ACO.
OBSOLESCENT.
Similar electrically to OS2/10 for operation at any
frequency from 350c/s to 15kc/s. Used in the Eggardon
Link Reversal Apparatus with output adjusted to 2587c/s
and 2868c/s. CH1/18C, pegs 2, 19. DD 1963.
DD Spec 2.225. OBSOLETE.
Line Up Test Oscillator used with RC4/1. Fits inside
receiver. Sine wave output at about 850Hz and level to
give tone at receiver output equal in amplitude to radio
microphone transmitter signal deviated to +19kHz.
DD 1962. DD Spec 5.68. ACO. OBSOLESCENT.
Crystal Controlled Oscillator
Output at least 150mV into
8.5MHz-11.5MHz, 11.5MHz-15MHz,
BXl/4. DD 1963. DD Spec 5.83.
used in EP7/4, EP7/4A.
750. Frequency bands:
l5MHz-18MHz, l8MHz-20MHz.
ACO. OBSOLESCENT.

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