Thursday, August 18, 2005

Prototype Eqso/Echolink Interface Card

For the benefit of some people who are interested to make
the interface card, this is how mine was made..

Still has lots of room on the board to shrink it. I used
2 modem isolation transformers instead of the specified
600 ohm types from Radio Spares, but it finally turned out
to be working perfectly!

The 2 blue stereo jack plugs are for connecting to the
PC Sound card, while the grey RS232 plug goes to the
PC Com Port 1.

The other side 3 RCA female connectors are for connecting to
the Transceiver PTT (yellow), the audio connector to the rig
microphone (white), and the the red connector is to connect
the audio from the rig.

I have added one more red LED on the left hand side of the board,
(not in the circuit diagram) which will indicate when power
from the PC Comm port is available to this card.
It will alternate ON & OFF with the other RED LED when in
the transmit mode!

The copper track side ! (Resoldered by 9W2VA as my work was
very shoddy)

Close up of the Veroboard. The 2 transformers are brand
new ones, taken out from 2 perfectly working Aztech 56k
Modems that I had to buy!

Another view of the completed card ready to be installed in a box.

Hope your card will be easier to build & test, compared to mine.

Just a reminder..this interface card will only be required if you
will be using your Amateur rig as a "gateway" to access either
Eqso or Echolink software.

If you just want to communicate with other Hams around the
world using the Eqso or Echolink software, you will not need this



  • Suchart, andy cannot stand unprofessional soldering. I sudah kena 'solder' sama dia lah. hehehehe...

    By Anonymous Anonymous, at 10:01 AM  

  • This comment has been removed by a blog administrator.

    By Blogger Rodney Yeo @, at 4:32 PM  

  • Bravo! Facinating homebrew projects guys! It is a master piece indeed! Keep up the ham spirit!

    By Blogger Rodney Yeo @, at 4:34 PM  

  • Wow wonderful la Suchart! I hope to learn from you how to do all this.

    But I am beginner in electronics and have no idea about all those parts you mentioned. =)

    By Blogger 9W2TLC, at 5:31 PM  

  • The best way to test the interface is to have 2 rigs on simplex same frequency. Then connect to Echotest Server Node#9999 or you can find it under conferences section. Do not worry, other people on the server will not hear you. It is useful for making fine tuning. Both rigs set to low power to prevent radiation swamp on each other rigs. PTT on Rig #2 and talk, Rig#1 receive and triggerthe echotest server and record. Release PTT on Rig#2, Echotest will playback the audio while PTT Rig#1 and should be able to hear on Rig#2. When everything is complete, then its show time for final tuning according to the local community preferences as such as I want louder or softer.

    By Anonymous Anonymous, at 12:48 PM  

  • Thanks LikWei for the tips we will work on it...

    By Blogger Rodney Yeo @, at 3:15 PM  

  • Any lubang where to get the transformers? Got any modem for me to scrap?

    By Anonymous Anonymous, at 12:24 AM  


    By Blogger Rodney Yeo @, at 11:14 PM  

  • The cheapest way to get the isolation transformer is to salvage it from a AM Transistor Radio bought from Supermarket Cheap Sale.

    The resistance on the primary and secondary section is 120:120 ohms on both ends as tested using a Sunwa Multimeter.

    By Blogger Rodney Yeo @, at 11:19 PM  

  • Sysop Settings control many of EchoLink's features when it is running in Sysop mode.

    EchoStation is a repeater-control program for Windows which makes it easy to set up a complete, fully-functional repeater or "announcement machine" using a personal computer.

    EchoLink® software allows licensed Amateur Radio stations to communicate with one another over the Internet, using voice-over-IP (VoIP) technology.

    By Blogger Rodney Yeo @, at 11:35 PM  

  • The tiny little transformer from the modem should be 600ohm:600ohm.

    By Anonymous Anonymous, at 1:38 PM  

  • TCP Optimizer is a software utility which can help your pc data transfer to the maximum especially when you are using it with EchoLink.

    By Blogger Rodney Yeo @, at 3:05 PM  

  • This comment has been removed by a blog administrator.

    By Blogger Rodney Yeo @, at 3:06 PM  

  • This comment has been removed by a blog administrator.

    By Blogger Rodney Yeo @, at 3:06 PM  

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