Revision: 0808

PIC16F84A Micro Controller EchoLink* Interface is designed to achieve some of the following points of Interest to Radio Amateurs:

	Real RS232 signals
	100% Galvanic Separation
	Plug-in Tone & AGC module (option)
	COR (Positive or Negative logic selectable)
	Hardware DTMF decoding
	Muting (automatic) of receiver audio
	Adjustable receiver and transmitter audio levels
	Power status, DTMF, PTT and COR LED's
	Uses a PIC16F84A
	DIN 5 Front Panel Connector for easy interface to Rig
	Transceiver connection has “HT” Header for portables
	No relays. Uses HFE4053 Analog Switches.
	12cm x 7cm, Double Sided PTH Board.
	Usable for other digital modes like PSK31
	A true homebrew project, you can build.

An AGC add-on card is available to effectively control receive audio level and tone.

* EchoLink is a registered trademark of  Synergenics, LLC