OS2/520A-C
OS2/52l
OS2/522
OS3/l
OS3/2
OS3/2A
053/3
053/4
OS3/5
OS3/502
053/503
221 -
052
Part of EP7/5ll.
OBSOLESCENT.
Printed circuit board.
DD 1967.
Gated Fixed Frequency Oscillators each containing 2 gated
oscillators operating at different frequencies. A = 0.8MHz
and 1.8MHz; B = 2.8MHz and 3.8MHz; C = 4.8MHz and 5.8MHz.
All are used in GE6M/509. CH1/43, pegs 1, 2, 6. DD 1968.
DD Spec 9.108. OBSOLESCENT.
Modulated
Modified
DD 1969.
Fixed Frequency Oscillator used in GE4M/540.
version of 052/517 with same index pegs.
DD Spec 9.127. OBSOLESCENT.
Oscillator and Multiplier
OS2/5ll. Printed board
WITHDRAWN.
used in
432mm
RC4/S04.
x 18lmm.
Similar to
DD 1969.
053 VARIABLE FREQUENCY OSCILLATORS
Modified version of TS/10 included in TE1/l. Frequency
range is selected by relays, and variable capacitor is
mechanically driven by drive unit TE1A/l which can be
disconnected
for
manual
operation.
DD 1960.
DD Spec 2.151. TI.L.S. OBSOLESCENT.
Used for spot frequency testing on OBs etc. Output: zero
dB volts from low impedance at 90, 2S0, 3K, 7K, 10kc/s.
CH1/18C. DD 1962. DD Spec 3.382. OBSOLESCENT.
As 053/2 but with output at
Superseded OS3/2. DD 1966.
900Hz also for line up tone.
DD Spec 3.382. OBSOLESCENT.
Portable, transistorised, battery operated oscillator for
testing OB apparatus. Switched frequencies 90Hz, 250Hz,
900Hz, 3kHz, SkHz, 7kHz. Output: -SOdB from 10Q. l33mm x
108mm
x
lS2mm.
(including
battery).
DD 1965.
DD Spec 3.421. ACO. OBSOLESCENT.
Three Phase Variable Frequency Oscillator used in UN13/14.
Supplies 3 outputs of about 1V from a low impedance source
phased 120. apart.
Frequency range
15Hz-100Hz.
Printed
board l78mm x l02mm. DD 1967. WITHDRAWN.
Variable Frequency Oscillator, 15Hz-100Hz, used in PS1/27
to drive AMl/37. l12mm x l78mm ISEP board with 25 way
connector, coding positions 3, 11, 19. DD 1969.
DD Spec 1.75. DDTM 1.48. ACO. OBSOLESCENT.
Variable Frequency Oscillator used in EP14M/S04. Tunable
over Bands I, 11, IV or V. CH1/12A. WITHDRAWN.
Variable Frequency Oscillator used in EP7/513 to generate
local oscillator signals at frequencies from 24MHz to

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