• Digimaster from ZLP Electronics. A variety of interfaces and connecting cables are available.
• PCInterfaces In both kit and pre-constructed form.
• Microkeyer USB interface from Microham. Other models are available.
• SignaLink from Tigertronics. Two models available, one that used the computer soundcard and DB9 connection, the second has a built in soundcard and connects via USB
• Rascal GLX from Bux CommCo. Available in kit or constructed form. A variety of cable options are also available from the site.
• Rigblaster from West Mountain Radio. Has interface models with both USB and RS232 DB9 connections. Includes inbuilt rig control capability.
• RigExpert USB interfaces and MixW software.
• VA3TO linking interface. Operates under EchoLink software and doubles as a soundcard interface for various digital modes.

Home Brewing

Interfaces can be fairly simple and thus are easily home-brewed. Here are 2 schematics. The first one is for PCs with a serial port being used for PTT, the second one for an Asus Eee netbook. It uses a VOX circuit for PTT.