Home Page for KC4KLM ' John ' and W4KUM ' Sam '

Modem Related Information for the Digital Modes Used in Amateur Radio

AEA CP-1 and AEA CP-100 Computer Patch Interface
	Two nice modems by Advanced Electronic Applications, loaded with features. Information on both models, manual, schematic, RS-232 option installation, and modification ideas.
How to Build a modem
	Build your own modem based on: AM7910, AM79101 XR-2211, XR-2206 and TCM3105 modem IC's.
Make a TTL to RS-232 Serial Interface
	Upgrade a TTL modem to talk to a PC using the LTC1383, or Maxim MAX202, MAX203 IC's. Very few, or no additional parts needed!

Pinouts and Wiring Requirements
	Serial port connections for DOS programs: Hamcomm, Terman ( AN-93 ) Baycom, Eskay Packet ( SP ) BMK Multy, and others.
Download Schematic, Manual, Data Sheet, & Parts
	For modems and serial interfaces. Places to find parts. Tips for many items. Learn about software for the modems mentioned here and where to download them.
What you won't find here:
These devices are beyond the intent of this web site.

About the Technicothica web site...
This site serves hobbyists who enjoy building electronic projects and have the desire to make their own modem for RTTY, Amtor, Pactor, Packet, and other similar modes. Over time, knowledge is either forgotten or lost on how to build such things. The difficult to use TNC, and now sound card related software seems to have nearly erased the simple modem from Amateur Radio history. Located on the Technicothica web site, is a collection of information acquired from the dusty archives of fellow digital enthusiasts.

Notice...
You are encouraged to check all of the pages on this web site for the information you seek, starting at the main page. Each page is possibly related to another. The information on each page is "as-is", try at your own risk, and so on. We can help you out some what, as time permits. Try to stay on topic. Please, do not ask to "engineer" or "re-engineer" a design to suit your special project. We do not sell parts or kits of any kind. All said, we are open to any suggestions on adding more material, as long as it is on topic with a particular web page of the Technicothica web site. An example of things that are not "on topic" are: Support for APRS, EMWIN, TNC's and sound card stuff.    ~Thanks!

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