The X1W-1 design supports an optional interface for the Aware Electronics RM60 and RM70 radiation monitors. Information on the RM60 and RM70 can be found on the Aware Electronics web site. Currently, software support is only in N4XI's WXN weather server.

If you plan on using a background radiation monitor and also wish to have an interface for the the rain gauge, the rain gauge will have to be used with the outdoor sensor/interface board, the X1W-2.

These assembly steps install the necessary components to use the RM-60/RM-70 background radiation monitor and the EMP sensor interface. Those installation instructions that use parts mounted in places where a different part is called for (e.g., a diode placed where the silk-screen shows a resistor) are shown in red.

Construction is divided up into three main sections and is called for in the appropriate section of the manual. If you follow the instructions in the manual, they should bring you here to the appropriate section when required.

Section 1: Power Supply
Section 2: Main Interface
Section 3: Jumpers

Section 1: Power Supply

The following components are located in the upper left-hand corner of the board between the 78L12 and the 78L05 regulators.

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Section 2: Main Interface

Note that this procedure also covers installing parts for the EMP sensor as well. The same 1-Wire interface chip services both the radiation monitor and the EMP sensor.

5% Tolerance Resistors

Monolithic Capacitors

Ferrite Beads

IC Sockets

Diode

Connectors

9V Battery Connector

If you are thinking about using a power supply instead of a battery for the EMP detector, don't. The opto-isolator is there for protection. If an external supply is used, you will risk allowing an EM discharge to possibly enter the equipment through the power supply lines or ground causing possible damage, bypassing the protection offered by the opto-isolator. Battery life is typically one to two years, depending on EMP activity.

Wires are fed to the board from the top.

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Section 3: Jumpers

As with the ferrite bead installation, use clipped resistor leads for jumpers. Form a narrow “U” with the clipped lead and pass the two ends through the PC board. Pull the leads down snug and spread them slightly.

RM-60/RM-70 Jumpers

These jumpers are found at JMP2 which is located right behind J1, the RJ-11 jack the RM-60 will plug into. All four jumpers are straight across, i.e., no crossing of wires.

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