Four State QRP Group

Four State


A Digital Mode Interface
From David Cripe, NMØS

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This Kit Has Been Retired

4S-Link, pronounced "Force Link", is a nifty little interface that connects you to the digital radio world. With proper software all sound card digital modes can be employed.

The circuit design provides complete isolation between your rig and your computer's sound card, thereby preventing ground loops (hum) and providing solid, reliable operation. Drive level to your transceiver is controlled through a front panel potentiometer. Attaching the 4S-Link to your computer is as easy as plugging into your sound card. A serial port or adapter is not required. The connections are clearly silk screened on the exterior of the enclosure, so there is no guessing which cable goes where.

A major feature is compatibility with Smart Phones, Tablets, and other devices that can run a digital mode app. All that's neccessary is for you to make the proper connections to your device's audio jacks. The 4S-Link has been designed to accept the output of those devices.

Two NMØS trademarks are obvious: innovation, and an attractive, rugged copper clad board enclosure with black solder mask and white silk screened labels. It's easy to assemble and looks great. There is no need to purchase a separate enclosure, see the photo page for details..

All parts are included, jacks, knobs, enclosure, transformers, everything.    This is a complete kit.

Features and Specifications
Enclosure:   3"x3.2"x2" predrilled and silkscreened enclosure is included.
Plug and Play:   No serial port or adapter required.
Device Compatibility:   Compatible with smart phones, tablets, and any computer with a soundcard.
Cabling:   1/8" (3.5mm) Stereo jacks are employed due to low cost and wide availability of stereo jumper cables.

Assembly Manual
Parts List (BOM)
Component Placement Diagram
Connecting your 4S-Link to Computers, Smart Phones, and Radios.
Photo Page
Elecraft's Excellent Capacitor Identification Page  Posted with permission.
Electronics 2000's Excellent Resistor Code Graphic Calculator  Posted with permission.

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