Elektor TAPIR Podręcznik budowy - Strona 11
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Drukuj stronęInsert the AAA battery into the battery compartment, observing the
polarity.
Figure 22. The AAA battery inserted. Notice polarity!
Fit PCB 1 and the screws
Figure 23. Finished assembly of the Elektor TAPIR.
Figure 24. Looking at the RCA connector and the 3.5-mm stereo jack and power switch.
Elektor "TAPIR" E-Smog Tester Kit | Construction Manual
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6 – The Antennas
Now you need to make two antennas, each of which is suitable for a
particular type of field: an E-field antenna for sensing electrical fields and
an H-field antenna for sensing magnetic fields.
Figure 25. A piece of 25 mm stiff wire, an RCA plug, and a piece of heat-shrink tubing.
The E-field antenna
Start with the E-field antenna. All you need for this is a length of solid,
insulated wire. Cut the wire included in the kit in the centre to obtain two
pieces approximately 25 cm long. Take one of these and
form a loop at one end. Cover the tip of the wire at this point with a
piece of heat-shrink tubing or electrical tape (see photo). This electrically
insulates the antenna and allows the loop to be used for "sniffing out"
electrical noise on, say, a circuit board, but carefully!
Figure 26. Loop at one end of the wire.
At the other end of the wire, strip off approximately 3 mm of the insulation
and slide the Cinch connector shell over the wire. Solder the wire to the
centre pin of the Cinch connector. Screw the connector together and
straighten the antenna. This antenna is now finished.
Figure 27. The E-field antenna is almost ready.