2.3.3.2
All-Call Amplifier
All-call amplifiers shall as a minimum conform to the following
specifications:
Output Power:
Minimum of 0.5 watt rms for each station
Total Harmonic
Distortion:
Less than 5 percent at rated output power with a
load equivalent to quantity of stations
connected to it in all-call mode of operation
Signal-to-Noise
Ratio:
60 dB or greater at rated output
Plus or minus 2 dB from 50 Hz to 10,000 Hz
Output Regulation:
Maintains output level within 2dB from
full to no load.
Input Sensitivity:
Compatible with master stations and central
equipment so amplifier delivers full-rated
output with sound pressure level of less
than 10 dynes/sq. cm 0.000145 psi
impinging on master station, speaker microphone
or hand set transmitter.
Amplifier Protection:
Prevent damage from shorted or open circuit.
2.3.3.3
Paging Amplifier
**************************************************************************
NOTE: To specify proper power rating of amplifier,
allow 1 watt for each cone type speaker and 1.5
watts for each horn type. Special circumstances may
dictate greater power requirements.
**************************************************************************
The paging amplifiers as a minimum shall conform to the following
specifications:
Input Voltage:
120 V ac, 60 Hz
Within plus or minus 3 dB from 60 to 10,000 Hz
Minimum Signal-to-
Noise Ratio:
60 dB at rated output
Total Harmonic
Distortion:
Less than 3 percent at rated power output from
70 to 12,000 Hz
Output Regulation:
Less than 2 dB from full to no load
Controls:
On/off, Input levels, and low cut filter
Input Sensitivity:
Matched to input circuit and providing full
rated output with sound pressure level of
SECTION 16721
Page 14
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