Goto Section: 11.31 | 11.33 | Table of Contents
Revised as of November 19, 2020
Goto Year:2020 |
§ 11.32 EAS Encoder.
(a) EAS Encoders must at a minimum be capable of encoding the EAS
protocol described in § 11.31 and providing the EAS code transmission
requirements described in § 11.51. EAS encoders must additionally
provide the following minimum specifications:
(1) Encoder programming. Access to encoder programming shall be
protected by a lock or other security measures and be configured so
that authorized personnel can readily select and program the EAS
Encoder with Originator, Event and Location codes for either manual or
(2) Inputs. The encoder shall have at least one input port used for
audio messages and at least one input port used for data messages.
(3) Outputs. The encoder shall have at least one audio output port and
at least one data output port.
(4) Calibration. EAS Encoders must provide a means to comply with the
modulation levels required in § 11.51(f).
(5) Day-Hour-Minute and Identification Stamps. The encoder shall affix
the JJJHHMM and LLLLLLLL codes automatically to all initial messages.
(6) Program Data Retention. Program data and codes shall be retained
even with the power removed.
(7) Indicator. An aural or visible means that it activated when the
Preamble is sent and deactivated at the End of Message code.
(8) Spurious Response. All frequency components outside 200 to 4000 Hz
shall be attenuated by 40 dB or more with respect to the output levels
of the mark or space frequencies.
(9) Attention Signal generator. The encoder must provide an attention
signal that complies with the following:
(i) Tone Frequencies. The audio tones shall have fundamental
frequencies of 853 and 960 Hz and not vary over Â±0.5 Hz.
(ii) Harmonic Distortion. The total harmonic distortion of each of the
audio tones may not exceed 5% at the encoder output terminals.
(iii) Minimum Level of Output. The encoder shall have an output level
capability of at least + 8 dBm into a 600 Ohm load impedance at each
audio tone. A means shall be provided to permit individual activation
of the two tones for calibration of associated systems.
(iv) Time Period for Transmission of Tones. The encoder shall have
timing circuitry that automatically generates the two tones
simultaneously for a time period of 8 seconds.
(v) Inadvertent activation. The switch used for initiating the
automatic generation of the simultaneous tones shall be protected to
prevent accidental operation.
(vi) Indicator Display. The encoder shall be provided with a visual
and/or aural indicator which clearly shows that the Attention Signal is
(b) Operating Temperature and Humidity. Encoders shall have the ability
to operate with the above specifications within an ambient temperature
range of 0 to + 50 degrees C and a range of relative humidity of up to
(c) Primary Supply Voltage Variation. Encoders shall be capable of
complying with the requirements of this section during a variation in
primary supply voltage of 85 percent to 115 percent of its rated value.
(d) Testing Encoder Units. Encoders not covered by § 11.34(e) of this
part shall be tested in a 10 V/m minimum RF field at an AM broadcast
frequency and a 0.5 V/m minimum RF field at an FM or TV broadcast
frequency to simulate actual working conditions.
[ 59 FR 67092 , Dec. 28, 1994, as amended at 77 FR 16703 , Mar. 22, 2012]
Goto Section: 11.31 | 11.33
Goto Year: 2020 |
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