Instruction manual

SM100 • 14
 46. Install C12, .01 uF disc capacitor (marked .01 or 103).
 47. Install R11, 470 ohm resistor (yellow-violet-brown).
 48. Install D7, 12 volt zener diode (grey glass marked 1N759A). A 12
zener diode has no greater than 12 volts across it. This means that
there is always 12 volts at the base of Q3 under normal operating
conditions.
 49. Install C14, .01 uF capacitor (marked .01, 103 or 10nF).
 50. Install C9, 10 uF electrolytic capacitor. Did you remember to use
the correct polarity? Good! We knew you would.
 51. Install L2, 1800 uH inductor (green case marked 182).
 52. Identify the type F jack. This is a connector, with thread like screws.
Begin by installing the solder lug over the screw threads. Solder short
leads onto the center point and solder lug point leaving both wires about
one inch long. Next, solder the wire connected to the center connection
of the PC board closest to L2. The solder lug connection, should be
connected to the PC board in the remaining hole near the corner of the
board.
Now you have installed all the parts on both boards. Take a few moments to
look over your work. Don’t forget find and fix any cold solder joints, solder
bridges, and misplaced parts. We are going to move on to building the
actual antenna itself. Since this may be a bit complicated, we hope that you
will be patient and take your time. The better job you do, the better it will
work in the future.
 54. Identify the iron ferrite rod and the enameled wire. Starting at one
end, begin to wrap the enameled wire around the ferrite rod, counting
with each turn. The beginning of the wire should extend about one half
inch past one end of the rod. The coil should be evenly spaced about
one half inch from each end of the rod. Be sure to make each turn neat
and snug. When you have wound exactly seventy turns, bend the wire
back towards the end of the wire that you started, and cut it about one
half inch past the end of the rod. This is now the center part of your
antenna. If you wish to use your Signal Magnet on a frequency not in
the 490 KHz to 1.67 MHz range, please refer to the table on page 18
labeled “Tuning Your SM100 To Other Frequencies.”
 55. Take the piece of 1/2 inch PVC and begin to wrap it with aluminum
foil. To properly wrap it, simply roll the foil onto it very neatly. Every few
turns, take time to carefully trim off any foil that extends past the ends.
After five turns, place a small paper clip at one end between the top two
pieces of foil. This is to help you solder on the grounding connection,
since it is almost impossible to solder aluminum foil (unless you contract
NASA or are someone with a lot more aluminum foil than things to do).