OSl
081/520
OS2/l
OS2/2
OS2/3
OS2/4
OS2/5
OS2/5A
OS2/6
OS2/7
OS2/8
082/9
OS2/10
- 216 -
Timing Pulse Generator and Divider used in CD2M/508 and
CD3M/515. Printed board with 33 way ISEP connector.
Indexing 21, 27, 31. DD 1972. OBSOLESCENT.
OS2 FIXED FREQUENCY OSCILLATORS
Two separate oscillators on plug-in chassis to mount on
ASM/l. Frequency can be pre-set to 400Hz, 600Hz, 700Hz or
900Hz. Designed for Communications System. Output: OdB
to 12dB into 600~. Superseded by OS2/33. DD 1957.
DD Spec 2.110. TI.L.2. OBSOLESCENT.
Oscillator, fixed frequency (600Hz or 700Hz) for emergency
use on voice frequency ringing circuits. Fits under local
battery telephone and is powered from it. Delivers lmW
into 600~. DD 1958. DD Spec 2.113. OBSOLESCENT.
DD 1958. WITHDRAWN.
Oscillator, fixed frequency (900Hz). Gives accurate zero
level output from low source impedance for level setting.
Plug in chassis for use with Type B Studio Equipment.
DD 1958. DD Spec 3.175. ACO. OBSOLESCENT.
Oscillator, fixed frequency (20kHz) used in monitoring VHF
rebroadcast transmissions into unattended or semi-attended
transmitting stations. Mounted on PAl/lOo DD 1958.
DD Spec 5.49. TI.T.IO. OBSOLESCENT.
Similar to OS2/5 but for 23kHz frequency. l52mm x 79mm x
63mm. Superseded by OS2/35. DD 1968. OBSOLESCENT.
DD 1958. CANCELLED.
Oscillator, fixed frequency (900c/s). Test oscillator
used in mobile control rooms. Plug in chassis CHl/8.
178mm x 73mm x 194mm. Two mounted on one panel. Printed
circuit. Transistors: GET4, GET5. DD 1958. WITHDRAWN.
Oscillator, fixed frequency, transistor, 8kc/s. Used in
remote control of unattended transmitters and works from
50V relay
supply.
Comprises two Wien Bridge type
oscillators (one standby) on 483mm x l33mm panel. Output:
zero into 600~. Transistors: OC20l, OC44, GETl05, GETl04.
DD 1959/60. DD Spec 3.246. OBSOLESCENT.
900c/s oscillator
OBSOLESCENT.
used on UN3/501.
DD 1959/60.
Used on VF Switching System. Pre-set to a frequency in
range 1.lllkHz~2.090kHz. Mounted on PN3/18 with UNl/9.
Plug-in chassis. DD 1960. DD Spec 2.173. DDHB 2.111.
TI.L.2. OBSOLESCENT.

16