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DTR Powered EchoLink Interface - "Tiny Echo"

Advanced, PIC 16F84A EchoLink Interface -"Fox Echo"

Audio AGC add-on Card for Foxecho-K7

 

  

  

 PIC 16F84A Micro Controller EchoLink* Interface

 

FOXECHO-K7

K7SFN

 

Click to enlarge


K7AGE

 Click to enlarge


Revision: 0808

 

 

Fox Delta: Foxecho-K7 Echolink Interface

 

 

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.

Foxecho-K7 interface uses an MT8870 DTMF Decoder and a PIC16F84A. Uses two 4N33 Opto Couplers and two transformers to achieve 100% isolation between transceiver and your PC.

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

* EchoLink is a registered trademark of  Synergenics, LLC


Picture of the Completed EchoLink* Interface

Click to enlarge

 

 FoxEcho-K7 Doc & Firmware
Technical Info Doc Fox Echo Schematic & Parts List
Transceiver Connection to DIN5 and Header Details Fox Echo Schematic & Parts List
 
Kit Parts List Fox Echo Schematic & Parts List
Foxecho-k7 Sysop Config. Document Fox Echo Schematic & Parts List
Foxecho-k7 Mic & Header Setup Fox Echo Schematic & Parts List

Schematic JPG
FoxEcho-K7 Schematic & Parts List

Schematic of the Isolated components JPG JPG
 Project Resources & Download
    
PIC16F84A Firmware

 Want to make your own PCBs?

FE-K7 RS274X Gerber Files

 
Andreas, DL5MGD's Echolink Webpage Fox Echo Schematic
 
DL5MGD PIC16F84A Firmware
 
Old Version Documents

 

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FoxEcho-K7 Kit (without Metal Case) 59.00

2CheckOut.com Inc. (Ohio, USA) is an authorized retailer for goods and services provided by Fox Delta.
Kit Packing List
Metal Cases no longer available
 
PCB and Kits also available from our shop at foxdelta.net Visit School Project Shop
 

 


2CheckOut.com Inc. (Ohio, USA) is an authorized retailer for goods and services provided by Fox Delta.
 
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