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GAI-Tronics 700 Series Page/Party

Installation Procedure

Step 1 — Electrical Noise Considerations

When planning your system, consider the following suggestions to avoid electrical noise caused by slip

rings and silicon control rectifier (SCR) power supplies.

Slip Rings -

Use a radio frequency (RF) alternative and avoid using slip rings as audio conductors. Slip

rings are a source of electrical noise and are not reliable.

SCR Power Supplies

are used to power motors or other heavy equipment, consider using one or all of the following four

recommendations to reduce electrical noise.

Separation—Locate the Page/Party

input or output cables. Electrical coupling between cables is reduced by the square of the distance

between the cables.

Shielding—Use shielded (armored) system cables if the cable must be run in the same bundle or cable

tray with the SCR power supply cables. Shielded cables reduce capacitive coupling between SCR

power supply cables and Page/Party

Isolation—Two methods of power source isolation can be used to avoid electrical noise:

A. Use a low capacitance (primary to secondary) isolation transformer between the Page/Party

and the ac supply to the SCRs. This electrically isolates the Page/Party

noise generated by the SCR on the ac power feed. Also use an isolation transformer to isolate the

Page/Party

ac power from an ungrounded ac power source. Note: The neutral side of the

transformer output must be grounded in all instances.

The size of the isolation transformer should be based on the number of amplifiers used in the system.

If ten or less amplifiers are used in the system, a 500 VA transformer is sufficient. If 11 to 20

amplifiers are used in the system, select a 1000 VA transformer. For systems with more than 20

amplifiers, the transformer should be sized to accommodate a load of 50 VA per amplifier.

B. A battery powered 24 V Page/Party

system. In this instance, the battery/battery charger provides isolation from the SCR noise on ac

power systems. Cable shielding and separation as mentioned above still apply.

: Avoid battery chargers that utilize SCRs in their design.

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Systems

- If the Page/Party

system will be installed in areas where SCR power supplies

system cables as far as possible from the SCR power supply

audio cables.

system can be used as an alternative to the standard 120 V ac

Pub. 42004-139D

Page: 2 of 10

system

system's ac power from the