082
- 2lS -
082/19
Crystal Oscillator providing about 250mV into
range 2SMHz-40MHz. BXl/4 with socket for
external oven. Used with UNl/15A when closer
required. First used MDl/502. DD 1963. DD
OBSOLESCENT.
75~ in the
mounting
control is
Spec 5.97.
OS2/l9A
Similar to OS2/l9 but with thermister fitted to external
oven and lamp and holder removed to distinguish between
oscillators with and without thermister control.
DD 1967/6S. WITHDRAWN.
OS2/l9B
As OS2/l9 without crystal oven. Used on OSl/5l5. BXl/4.
DD 1967/6S. WITHDRAWN.
OS2/20
Crystal Oscillator used in UNl/39. 7SMHz-95MHz or
95MHz-llOMHz. Includes miniature oven (Salford QC940B).
Used with UNl/15A when close temperature control is
required.
BXl/4.
DD 1963.
DD Spec 5.72.
ACO.
OBSOLESCENT.
OS2/20A
As OS2/20
thermister.
but with oven circuit modified to include
DD 1966. DD Spec 5.72. OBSOLESCENT.
a
OS2/2l
Oscillator, 60kHz, used in EP6/50l to provide bias and
erase currents. Comprises two separate oscillators, one
for Commag and one for Sepmag. CHl/1SC. DD 1964.
DD Spec 1.3S. ACO. OBSOLESCENT.
OS2/22
Crystal Oscillator used in Carrier Drive Panel (PA5M/2A,
PA6M/2B) to give square wave output of either l40.4kc/s or
l12.0kc/s. Commercial oscillator plus limiter circuit
with transistor OC44. CHl/lSC. DD 1965. DD Spec 2.23S.
WITHDRAWN.
OS2/25
Racal Precision Frequency Standard SASlO (lMc/s) fitted in
CHl/12B. Used in EPl/4. DD 1965. WITHDRAWN.
OS2/26
For any desired frequency in range 15Hz-20kHz. Used as
tone generator for VF switching. Printed circuit board
for fitting in CHI/IS. Included in UNlM/65A, UNlM/65B.
DD 1965. DD Spec 2.256. OBSOLESCENT.
OS2/27
082/2S
DD 1966. CANCELLED.
Provides square waves at frequencies of 2.6kHz, 5.4kHz,
5.6kHz, S.OkHz at approximately 1.5V d.a.p. into 600~.
Used as the carrier generator at an 8B telephone system
terminal. CHl/lSC, pegs 11, 39. DD 1967. DD Spec 2.272.
OBSOLESCENT.
OS2/29
Used in PAlM/56. Oscillates continuously at l67.9Hz and
lS6.2Hz using 2 plug in tuned reeds. CHl/lSC, pegs 12,
42. DD 1969. WITHDRAWN.
OS2/29A
Modified OS2/29 to give approximately 6dB
output level. Used for Voice of America
DD 1969. WITHDRAWN.
increase in
Unit only.

18