Specifications

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Your PC as Broadcast Equipment
Computers are often viewed as isolated devices much like any office machine, in that they can be
protected against power transients by a simple protected power strip. However, when you make the
commitment to install Simian and your entire library of music, commercials and station production
packages, your computer suddenly becomes a major piece of critical broadcast equipment.
Normally, broadcast equipment is mounted in grounded metal racks, and the individual devices that sit on
the rack are still separately bonded to a master station ground. This should also be done with the
computers and any other computer-connected equipment. Since a typical computer does not usually
have a specified bonding connection, you or your engineer should look for a convenient screw near the
power supply that is firmly screwed into the metal chassis. A # 14 or larger wire should be run from there
to the nearest equipment bonding (grounding) point.
You'll also want to use protected power strips to further isolate your system from interference or electrical
problems. These can also protect external connections like the telephone line that is connected to your
modem. By far, the best means of overall protection against serious electrical problems is to use an un-
interruptible power supply (UPS). The proper type to use is the kind that continuously charges a battery.
The battery then operates a power converter to provide power to the protected load (the computer and its
equipment). Some UPS devices use fast switching to transfer the load from AC mains to converted
battery power and therefore do not provide as much protection.
Another extremely important issue is adequate cooling and freedom of access. A reasonably dust free
environment, off the floor with good air circulation is what you should seek. Remember as well, that in
time of emergency or when certain support questions need to be answered, you may be asked to check
the connections on the back of the machine. A good installation requires accessibility.
If you are in a building with the broadcast transmitter locally installed, you should consult with your
engineer about possible ‘special’ protection that may be needed. This may include shielded network
cables, choke protected telephone lines, ferrite beads on Trigger wires, physical screening or other
specialized practices. Care should also be exercised with wire runs. For example, network and telephone
cables should be run away from AC wiring. All audio wiring should be shielded and the shield
appropriately grounded.
These simple procedures will not only make your station more reliable, but can save you time and money
spent troubleshooting "ghost problems".