The EI-2010 Controller and Interface
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The EI-2010 was designed to satisfy a wide range of user applications.

Some features are:

The source audio levels is brought up to 0dBm (~750mvpp) to ensure that the optional CTCSS and the standard DTMF decoder get the correct signal level to process most reliably those signals.

A optional CTCSS decoder / encoder can be installed at extra cost, if the end user has a need for this feature. The decoder is programmable via the Windows™ Programming interface. If the Interface Controller is used in a Simplex application, then the CTCSS circuitry can Encode (Transmit a tone) and Decode (Receive a tone) without any additional Hardware. If the interface is configured as Repeater Controller, Tone Encode is not possible with a single chip.

The EI-2010 has a standard DTMF decoder chip installed that reliably decodes the incoming DTMF signals.
  • Before the Audio enters the Soundboard's Microphone circuit, a Trim Potentiometer allows to attenuate the level to fit the Sound Boards needs. It is also possible to fine tune audio for better results across the Internet. The circuit does either boost / cut bass frequencies and if needed, boost or cut treble frequencies. Once adjusted to your system, it is possible to achieve a very natural sound.
  • The EI-2010 has a built in Real Time Clock (RTC) for time keeping and other features the require precise time.

System Applications include:

  1. Echo-Link Simplex
  2. Echo-Link with repeater
  3. Stand alone Repeater
  4. SVXLINK Simplex
  5. SVXLINK Repeater
  6. Digital Software modes

EI-2010 Options

  1. CTCSS encode / decode
  2. Voice Corder for up to 8 Minutes

Fig.1 EI-2010 Proto Type

DTMF is being muted either to the Internet or if in Repeater mode to the Transmitter.

The EI-2010 has provisions to process various sensor inputs.

There are three Analog to Digital inputs. These inputs are over voltage protected and range from 0-3.6V

Also, available on the back of the interface are 2 Digital alarm inputs.

The CAS input can range between 5 - 24 VDC accepting positive going signals

SB LINE and SPKR inputs are over current protected.

All system parameter are stored non volatile in EEPROM.

The transmit audio level can be remotely adjusted, there is no need to visit the remote site for this adjustment. Also, the CW tone level can be controlled via remote command. The CW tones are reshaped to a Sine Wave for a smooth sound. Front panel indicator can be turned off to reduce energy consumption. This can be done remotely.

 

EZ Echo-Link Guide

Comprehensive guide to operating the Echo-Link Voice over IP system. Published by N6FN

 

 

Have a peek at the PCB