Hardware

You will need a modem that handles the AMTOR protocol.
There are several of them, new and 2nd hand.
2nd hand modem are sold in most countries, as many have been sold and most are now lying idle
on the shelf in many HAM shacks. And the owners usually part with them at a reasonable price.

These are the most popular all-mode datacontrollers used over the years:
They all connect as any other TNC, to the HF tranceivers PTT & AF In/Out and to the computers serialport.


KAM PLUS by Kantronics

PK232MBX by AEA (Now TIMEWAVE)

MFJ-1278 by MFJ Enterprises

AMT-1 by ICS Electronics LTD