Unsupported 4U card with '3' width front panel. DD 1981.
EDI 10402(1) AUG 8S. DDMI 1.260(84). DDHB 1.190(84).
DAC and Post Filter.
The unit, which forms part of the Sub
Nyquist PAL distribution system, takes in 8-bit digital
words at emitter coupled logic levels, and converts them
into a standard level composite video waveform. Internally
8-bit samples at 2fsc are digitally comb filtered to give
an output sample stream to the DAC at 4fsc. A separate
unfiltered data path is incorporated to allow undistorted
transmission of field interval signals. Power
requirements 240 V a.c. at approx. ISO W. PN3/S4. Parent
equipment used in conjunction with other units of the 68
PAL System. Sub-units C09/S06, COS/SOS, FL1/S33 x 4,
PS4/18A x 2, UN14/S44, UN23/689, UN23/688, UN26/S84. DD
1982. DDHB 1.177(83).
YUV Video D.A.C.
Triple DAC unit for 8-bit digital YUV
data. Uses similar circuitry to the C09/S06, but with TTL
lvel inputs. Three 7S Q outputs from each channel. Full
filtering and sin x equalisation is included.
Power requirements +12 V at 3S0 mA +S V at SO mA - 12 V at
300 mA -S V at 400 mA. PN1/44. DD 1984. DDHB 8.420(84).
RGB Video D.A.C.
Identical to the C09/S09 except that
different types of low-pass filters are fitted which makes
it suitable for RGB 8-bit digital video signals. Power
requirements +12 V at 3S0 mA, +S V at SO mA, -12 V at
300 mA, -S V at 400 mA. PN1/44. Chassis extender CH4/S.
C0090S10 C09/S10&S10A Triple Video D.A.C. The C09/S10 is a triple DAC unit for
8-bit digital YUV data. The unit uses similar circuitry to
the C09/S09, but has an ECL balanced clock receiver and
additional circuitry to add shaped mixed syncs to the Y
output from a TTL level mixed syncs input. Three 7S Q
outputs are available from each channel which are filtered
together with sin x correction.
The C09/S10A is identical to the C09/S10 but has three wide
band filters making it suitable for RGB use. Power
Requirements +12 V; -12 V; +S V; -S V. PN1/44. Chassis
extender CH4/S. DD(l) 1985.
Triple Video D.A.C.
Triple Video D.A.C. provides lO-bit
D to A conversion of either YUV, YC, or RGB video data and
employs plug-in filters to accommodate narrow or wideband
channels as required. A plug-in matrix sub-board provides
for all signal conversion requirements with both pre-and
post-matrix signals being available as 7S Q outputs. The
unit also delivers mixed syncs (2 V p-p into 7S Q)
generated from a TTL level MS input, and can optionally
insert syncs into the Y or G output. Power requirements
i12 V, 600 mA; is V, 200 mA. Termination panel PA20/S40.
BBC Chassis 6-U card. Parent equipment EPSM/S24. D & ED(V)
Triple Video D.A.C.
clocked at 13.5 MHz
Three channel DAC. All
with 6.75 MHz filters.