EAS EAS Equipment and Technology 2 — Questions and Answers
Question 1: What is the purpose of the EAS end-of-message (EOM) signal?
- To indicate the alert transmission is complete (Correct answer)
- To announce the next scheduled test
- To reset decoder equipment to standby
- To trigger a follow-up broadcast
Correct answer: To indicate the alert transmission is complete
The EOM signal consists of three identical bursts that notify receiving equipment the EAS message has ended.
Question 2: Which modulation method does the SAME protocol use to encode header data?
- FSK (Frequency Shift Keying) at 520.83 baud (Correct answer)
- AM modulation at 1000 Hz
- FM subcarrier at 67 kHz
- QPSK at 9600 baud
Correct answer: FSK (Frequency Shift Keying) at 520.83 baud
SAME uses FSK at 520.83 baud, toggling between mark and space tones to encode digital header information.
Question 3: How long does the EAS attention signal last before the voice message begins?
- 8–25 seconds (Correct answer)
- 1–3 seconds
- 30–60 seconds
- Exactly 10 seconds
Correct answer: 8–25 seconds
The EAS attention signal (two-tone 853/960 Hz tones) lasts between 8 and 25 seconds to alert listeners before the voice message.
Question 4: What organization certifies EAS equipment for use by broadcast stations?
- FCC (Federal Communications Commission) (Correct answer)
- FEMA
- NOAA
- DHS
Correct answer: FCC (Federal Communications Commission)
The FCC certifies EAS equipment and maintains a list of approved devices that broadcast stations must use.
Question 5: What is the maximum audio message duration allowed in a standard EAS alert?
- 2 minutes (Correct answer)
- 5 minutes
- 10 minutes
- 30 minutes
Correct answer: 2 minutes
Standard EAS audio messages are limited to 2 minutes, though the alert validity period coded in the SAME header can be longer.
Question 6: What technology does Wireless Emergency Alerts (WEA) use to deliver alerts to cell phones?
- Cell Broadcast Service (CBS) (Correct answer)
- SMS text messaging
- Push notification apps
- Satellite downlink
Correct answer: Cell Broadcast Service (CBS)
WEA uses Cell Broadcast Service technology to simultaneously transmit alerts to all compatible phones in a geographic area.
EAS EAS Equipment and Technology 2
What is the purpose of the EAS end-of-message (EOM) signal?