EIA

EIA

Frequencies	30 MHz,800 MHz
Frequency Range	30 MHz - 800 MHz
Mode	NFM
Modulation	MFSK
ACF	—
Emission Designator	—
Bandwidth	5 kHz
Location	Worldwide
Short Description	EIA is a 5/6-tone selcall mode defined by the Electronics Industries Association in the United States. Also known as Motorola MetroPage.
I/Q Raw Recording	—
Audio Sample

EIA is a 5/6 tone selcall mode defined by the Electronics Industries Association in the United States. Also known as Motorola MetroPage.

Selcall (selective calling) is a type of squelch protocol used in radio communications systems, in which transmissions include a brief burst of sequential audio tones. Receivers that are set to respond to the transmitted tone sequence will open their squelch, while others will remain muted.

EIA has 15 tones to choose from, but only sends bursts of up to 5 or 6 tones. Each tone has a duration of 33 msmilliseconds (.001 of a second) per tone. The bursts transmit right before a radio transmission.

Samples

EIA Full Range	EIA 5-Tones

Decoding Software

Hobby Level Software

• Sorcerer
• multimon-ng

Professional Software

• Rohde&Schwarz CA100

Additional Links

• shoc Database: EIA
• WAVECOM Database: EIA
• NumbersOddities.nl Faq, Page 32
• Connect Systems Incorporated Programming Manual with EIA
• Tone Signaling Charts