Parallel Logic Radio Interface
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PLRI (Parallel Logic Radio Interface) is a set of circuits of interest to radio amateurs (hams). These circuits are fully compatible with IRLP (Internet Radio Linking Project). IRLP is trademarked by Dave Cameron.
The circuit shown below is the Deluxe PLRI interface, and is used to connect a radio to a PC using a parallel port and sound card. This circuit is fully compatible with the Version 3 IRLP board, and can be used in place of an IRLP board. This circuit allows negative or positive COS from the radio, and also supports negative or positive PTT keying. This circuit can be home built for roughly $20 US.
This circuit can be used with the IRLP software, RtpDir, TheLinkBox, or as a repeater controller board under any of the supported Linux software packages.
History
Development on the prototype interface began in 2008. All of the PLRI circuits are original designs by Kyle Yoksh, K0KN, and therefore not reverse-engineered from the IRLP board or elsewhere.
The PLRI circuit has had two major revisions so far. A quantum leap circuit is in early development in late 2009.
There are also two other PLRI circuits. One is an adapter to allow use of an IRLP board to be controlled by a serial port, and the other provides the AUX 1,2,3 outputs not found on early IRLP boards.
Construction
The PLRI circuits are designed to use discrete components and DIP socketed integrated circuits for several reasons. For one thing, these are commonly found in ham operator's "junk boxes". Also, discrete transistors are able to sink more current than the tiny surface-mount transistors. Special soldering irons and magnifying glasses are not required!
This project includes a set of electronic schematics of interest to radio amateurs (ham radio).
These circuits are compatible with the IRLP voice-over-IP (VOIP) system, and can be used for Echolink, IRLP, Asterisk and D-Star systems using the RtpDir or TheLinkBox software packages.
The PRLI Deluxe Interface Circuit can be directly connected to the node radio(s), or connected to the node radio(s) via a standard Rigblaster-type radio interface.