OPTION DESCRIPTIONS
The circuit will accept EIA Specifications RS330 and RS343 (875-line) formats having any
one of the three vertical interval wave forms as described in the referenced specifications
(“broadcast”, “industrial”, “military”). Operation with either the “industrial” or “military”
wave forms (without equalization pulses in the vertical blanking interval) will require
selection of field rate time storage (refer to the “Time Storage Rate Selection” paragraph
above).
The inserter will also accept some single-field, non-interlaced video formats. In the absence
of a published standard of these formats, operation must be considered on a case-by-case
basis. Testing of this circuit has been performed using a limited number of non-interlaced
formats.
The Assembly 20125-2 will accept a 525-line Y/C (separated luminance and chrominance
signals).
Input Level is One volt,
±
10%, peak-to-peak, into a load of 75
Ω
,
±
10%, to ground.
Through-put frequency response is within
±
3 dB from 25 Hertz to 10 Megahertz.
The input is terminated with 75
Ω
,
±
10%, to ground. When operating with Y/C video, both
the Y and C inputs are terminated with 75
Ω
.
J2 - VIDEO OUTPUT
FORMAT
Same as the input, containing inserted characters.
OUTPUT LEVEL
Nominally the same as the input, into a load of 75
Ω
,
±
10%, to ground.
J2 and J3
Y/C Pin Assignments
Pin Number
Assignment
1 Luminance
Return
2 Chrominance
Return
3 Luminance
Input
4 Chrominance
Input
Symmetricom, Inc.
TM7000 TymMachine TCG/T (Rev D)
A-49
