EMP/Rain Gauge Interface Installation
1-Wire Outdoor Sensor/Interface Kit

Stop! These parts are installed only if you also purchased the X1W-1 kit and have elected to put the EMP sensor and rain gauge interfaces on this board. If this is not the case, then skip to the next section.


Refer to the layout diagram for clarification of parts placement. All references to up, down, left, and right assume that you are looking at the PCB with the silkscreen TAPR logo at the lower right-hand side of the board. All components are mounted on the top of the PC board.

5% Tolerance Resistors

Ok
Procedure
  10K, 5% (brown-black-orange-gold) at R1
  10K, 5% (brown-black-orange-gold) at R2
  220, 5% (red-red-brown-gold) at R3
  100, 5% (brown-black-brown-gold) at R4
  Solder and clip eight leads. Wear safety glasses and observe proper precautions!

Monolithic Capacitors

Ok
Procedure
  0.1 uF (104) at C1
  100 pF (101 or 100) at C3
  Solder and clip four leads. Wear safety glasses and observe proper precautions!

Ferrite Beads

  Ferrite bead at L1.
  Ferrite bead at L2.
  Solder and clip four leads. Wear safety glasses and observe proper precautions!

Opto-Isolators

IC sockets will not be used in the outdoor installation of the interface. The reason being that exposure to the elements will make the circuit very unstable due to corrosion of the socket contacts and IC pins. If you insist on installing and using the sockets, understand that you will more than likely have problems in a short period of time.

As with the sockets, two corner pins should be soldered first and then check alignment. Using some sort of insulated tool, apply light pressure to the top of the IC against the board and re-heat the connections. This should properly seat the IC. Once this is done, solder the remaining pins. Don't forget to go back and re-solder the two corners pins when you are finished. This will insure that you do not have any cold solder-connections.

Ok
Procedure
  U2 - Insert the 4N28 into the holes on the board so that pin one (beside dot or the pin to the left of the notch with the notch facing up) goes in the square hole on the PC board. For U2, this is the lower LH corner with the notch facing the left side of the PC board. Install the IC as outlined above.
  U6 - Insert the 4N28 into the holes on the board so that pin one (beside dot or the pin to the left of the notch with the notch facing up) goes in the square hole on the PC board. For U6, this is the lower RH corner with the notch facing the bottom of the PC board. Install the IC as outlined above.

Diode

Ok
Procedure
  D1 - BAT42, Schottky Barrier Diode
  Solder and clip two leads. Wear safety glasses and observe proper precautions!

Jacks

Ok
Procedure
  RCA Female Jack at J5. The fit may be a bit tight. Gentle pressure might be required to properly seat the part on the board. Take your time if this is the case.
  RJ11 6-4p female jack at J3

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. The battery life is almost it's shelf life. A small investment to make every few years for the added protection.

Wires are fed to the board from the top.

Ok
Procedure
  Solder the red lead to the + hole at P4
  Solder the black lead to the - hole at P4

Rain Gauge Jumpers

At this point you will need to determine which of the active pins are connected to the rain gauge reed switch. Both Davis and Rain-Wise gauges parallel two conductors for one signal lead (four conductors total). The following procedure will determine which pins should be used. It is assumed that a RJ11 6-4p plug is on the end of the cable coming from the rain gauge. If not, one will need to be placed on the end of the cable before proceeding.

Insulated wire should be used to form the jumpers for the rain gauge. As each jumper is installed, solder and clip the leads.

Ok
Procedure
  Jump one of the selected pins (W, X, Y, or Z) to A at JMP2
  Jump the remaining selected pin (W, X, Y, or Z) to B at JMP2

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