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N4XI X1W-4 EMP Sensor Kit

Unfortunately the X1W-4 EMP Sensor kit is no longer available. The bare board for the DCD State Machine is available. Please contact us for details.

The EMP sensor kit was developed as a cost effective alternative to more expensive lightning detectors on the market. It boasts a fast response time and also allows adding an experimental input filter (a low-pass LC circuit which is normally not populated). Compared with commercial sensors, this unit is more sensitive, and allows repairs using readily available parts.

The design employed is essentially a VLF broadband receiver. The heart of the circuit is a Darlington pair that provides an open-collector output capable of safely sinking several mA. When a stroke is detected the output momentarily shorts to ground. Designed to be used with the X1W-1 or X1W-2 EMP interface, the output is fed to a simple 1-Wire counter which is then read by the system periodically.

Other than the usual assembly tools for kits, you will also need a hacksaw, drill and a high-wattage soldering iron or gun. The latter will only be used to sweat solder the copper antenna pipe to the PC board. A small 15W-25W iron will still be required to solder all other components on the PC board.

Ordering Information

Sorry, X1W-4 EMP Sensor Kit is no longer available

Assembly and Operations Manual

The assembly and operations manual can be found online at http://www.tapr.org/n4xi-tmp-html/x1w-4/


TAPR kits can be complex depending on the kitting experience of each builder. We don't think you will have trouble with the kit, but it does require some knowledge and experience to successfully go from a kit to a finished, usable unit, depending on the mode of operations.

The T-238 series and X1W series kits are discussed on the Weather Special Interest Group (WXSIG). You can join WXSIG via the web at:



View WXN: A Weather Server For Amateur Radio


The TAPR X1W-4 Kit was made possible by the efforts of:
John Bennett, N4XI - Conceptual and PCB Design
Steve Bible, N7HPR - Project Manager
John Koster, W9DDD - Assistant Project Manager
Joe Borovetz, WA5VMS - Parts Liaison
Dwight Hazen, WB9TLH - Beta Tester


1-Wire™ is a registered trademark of Dallas Semiconductor Corporation, a wholly owned subsidiary of Maxim Integrated Products

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