Its a very easy interface to build an requires only a few £/$ worth of components. A you can see by the picture on the right, there`s not much to it. To be honest, the pictur is misleading. This hamcomm interface has an added `extra` facility. The original hamcom interface was RX (receive) only. This one has a TX (transmit) bit added on so that th user can send also.
So what can you do with it? Pretty muc anything really. Its most commonly used for the reception of data modes like RTTY an AmTOR but can be found on simple Fax systems and of course SSTV systems. I have even see it used to decode 1200bd packet radio. Its