Notes on Experiment 12  This experiment is pretty cool: if you
get it to work right, you'll get a strong, clear signal. It's
clear as day when everything is working; the output of my
receiving antenna shot up to 4.5 volts when I pointed the
transmitter at it.  Most of the construction was simple. Here
are a few recommendations:  1. Definitely check that your
amplifier is working before building the antenna! I didn't, and
at first, life really sucked. You basically need to rebuild the
circuit on the top of page 79. I checked this after I did
everything else (and after I saw that it wasn't working), and it
was a major pain in the ass. That was dumb on my part; learn
from my stupidity.  2. The thing that I did wrong (and that I
suspect many of you might do wrong) is to forget to hook all
your zero point voltages up to ground. The reason that many of
you will forget this is that it isn't shown in the circuit
diagram on page 104. The negative input to the op-amp (socket 2)
and the negative output lead both need to