RF Modem using XR2211 / XR2206

This is a project based on the above chips , details of which were sent to me by VU3CRJ. I have designed a PCB for the same but unfortunately I have not tried it out. It is to be used with the Baycom Software for Packet Radio. The software is available at the homepage of Harry Lythall. Earlier I have successfully built and sold Amateur Radio Modem using the AM7910/1 to local HAMs but unfortunately the chips went out of circulation. The above combination of XR2211 / XR2206 turns out to be much more cheaper and simpler. The circuit diagram of the project is shown below.