Service manual

STP 11-25R13-SM-TG
3 - 99
Subject Area 12: DESIGN/DEVELOP
DESIGN AN AUDIOVISUAL (AV) SYSTEM
113-575-9006
Conditions: In a tactical or garrison environment, given a computer (CPU 386 or higher speed and
capacity) with a math coprocessor (387 or equivalent), 5 MB of RAM (or higher), monitor (14- to 19-inch
VGA or higher resolution), video drive card (with built-in memory), hard drive (120 MB or higher), floppy
drive (1.2 MB, 5-1/4 inch), floppy drive (1.4 MB, 3-1/2 inch), mouse (or a light pen or graphics pad), plotter
(8-pin capable of plotting size D drawings), printer (24-pin wide carriage dot matrix or better), AutoCAD
software (version 10 or higher), Video/Audio Libraries software (version 4.0 or higher), tape or worm
memory backup system, and generic software to support Computer-Aided Drafting (CAD).
Standards: The standards are met when the audiovisual system drawing is accurate and follows CAD
standards.
Performance Measures Results
NOTE: CAD standards follow practical methods used in mechanical drafting with redundant
cross-referencing when possible.
1. Draw all signal flow from left to right. P F
2. Do not cross signal path lines, if possible. P F
NOTE: Crossed lines do not indicate a connection; indicate connected lines with a dot.
3. Include a Title block and a Revisions block. P F
4. Include a drawing number following Broadcast Facility Record (BFR) numbering
standards.
P F
5. Follow CAD drawing symbols. P F
6. Draft drawings to scale where possible; indicate the scale in the Title block. P F
7. Use English decimal units. P F
8. Plot drawings kept on file by using a different color for each layer. P F
9. Include color scheme on drawing legend. P F
10. Reflect exceptions to the +4 dBm audio standard by inserting the signal level value on
the line in an enclosure. Do not break the line with the enclosure.
P F
11. Indicate all pads and delay lines by inserting their values on the line in an enclosure.
Include input and output levels.
P F
12. Identify each CAD cable located in the Cable Run list by number and insert the number
above or parallel to the line of the drawing.
P F
NOTE: The Cable Run list contains separate cable number documentation for each type of
signal. Documentation includes number, source, destination, and type of signal; lengths of
cable, type of cable, and signal level are optional.
13. Number and label all racks on drawings. P F
14. Draw and label all remote panels. P F
15. Construct CAD drawings using separate layers to create a system drawing. P F
NOTE: Since drawings are no longer limited to size of drawing surface, layering portions of
drawing provides the ability to edit and reconfigure system for final plotting.