Radio Operations with E.O.M (End Of Message) Detection

The E.O.M detection function makes the radio to return to its operation in previous state immediately before alert receiving, a unique feature in Reecom Alert Radios. It is working when the radio Alert Mode is set to 'VOICE' or 'VOICE EOM' (for R-200 or R-500 radio), if not, please refer to the User's Manual or Programming Guide in Setting ALERT MODE section to set it up properly.

General Operation:

The EOM signal is a three burst tones separated by one second pause transmitted from NWS (National Weather Service) station.

The alert radio is usually working in two states which are 1.) speaker mute / no voice (refers to Standby  Mode), or 2). voice on the speaker (refers to Radio-On Mode, either in WX band or AM/FM band). When the radio is set in VOICE alert mode and upon Alert Receiving,  the radio will activate siren for about 8 seconds (if siren volume has not set mute and the receiving event has not been blocked out), then voice broadcast the event message. When the radio detects the EOM signal and completes the validation process, the radio will return to the previous state either in Standby  Mode or Radio-On Mode, depending on the the state immediately before Alert Receiving.


1. Radio-On Mode refers to the broadcast in either weather (WX) band (one of the 7 channels) or AM/FM radio station (for Reecom R-1650 or R-500 radio).

2. Alert Receiving refers to the latest alert received if multiple alerts issued from NWS.

The examples below elaborate the radio operation with the E.O.M detection.

Example 1: Before Alert Receiving, the radio was in Standby Mode (i.e. no voice on the speaker and no key is pressed)

Standby Mode (speaker mute).....ALERT RECEIVING......, then siren, then voice broadcast (Radio-On Mode in WX band), then EOM detection / validation, then return to the Standby Mode (before Alert Receiving) operation.

Example 2: Before alert receiving, the radio was in Radio-On Mode (voice on the speaker).

Radio-On Mode (voice on speaker).....ALERT RECEIVING......, then siren, then voice broadcast (Radio-On Mode in WX Band), then EOM detection / validation, then returns to the Radio-On Mode (before Alert Receiving) operation.

In this example, the Alert Receiving (emergency alerts / weekly tests) is considered as an interrupt to the listening radio broadcast. Upon EOM signal processing completion, the radio will switches back to the previous broadcast on AM/FM station or WX channel (the previous state before Alert Receiving). The radio voice will NOT be stopped or reset to Standby Mode due to the Alert Receiving interruption. 

The E.O.M function will not always bring the radio back to Standby Mode, or reset, depending on the radio state immediately before the very last Alert Receiving.

Let's take a special case for example although it would happen very rarely. Suppose that the radio was initially in Standby Mode (speaker mute), then Alert Receiving, then siren, then voice broadcast (in Radio-On Mode in WX band), then EOM detection, then new alert (2nd alert) receiving before the radio ended the EOM signal validation process i.e. voice still on or in Radio-On Mode before and during 2nd Alert Receiving, then 2nd time siren, then 2nd time voice broadcast in WX band, then 2nd time EOM detection / validation, and no further alerts from NWS. Finally, the radio continues to broadcast in WX band since the radio was in Radio-On Mode state immediately before the 2nd Alert Receiving. The back to back transmissions from NWS (or referred as  'back to back alerts') could be a quick update to provide fresh information or a signal to raise the public attention for impending danger / disaster and the like. Users can  leave the radio voice on or stop it manually, if desired.

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