Fldigi

Fldigi is a sound-card digital radio program for Linux, Mac, and Windows. An Android version, AndFlmsg, is also available, although it has limited features compared to the desktop version. Several other programs are available for use with Fldigi. Fldigi, Flmsg, and Flamp are used on the ORCA Digital Net.

Flmsg

Flmsg allows the user to enter data into predefined forms, which are then sent over radio. When they are received, the receiving station can load the data into its copy of the form, speeding up transfers by avoiding the need for transmission of the entire form. The files do not have to be sent over radio; they can also be emailed or sent by any other means of file transfer. When a form is received, it can be converted into a printable HTML document.

Andflmsg combines the functions of Fldigi and Flmsg into an Android app.

Flamp

Flamp is a file transfer program that works using Fldigi as a modem. It breaks the message into blocks (somewhat similar to packets, for those who are familiar with IP or AX.25 packet switching) with error detection codes. If the entire message is not received, only the parts that were not successfully received need to be re-sent. With long messages, this can drastically reduce the time to successfully transfer a file in less-than-ideal propagation conditions. Flamp can be used to transfer Flmsg forms. The only major disadvantage of Flamp is that it is not compatible with Andflmsg; if all net participants are using desktops or laptops, there is little reason not to send forms over Flamp.