project checkoff

[Kris Pister]

The goal is to get intelligible voice from your microphone to your
speaker. Don't worry about distance - show off if you can, but it's not
what you're graded on.
If you can't get voice, then some of the other things to demonstrate,
roughly in decreasing order of difficulty:
o binary data - if you tap your microphone, do you get clicks on the
speaker?
o reception of commercial AM broadcasts on your receiver
o transmission of voice to a commercial AM receiver
o transmission of voice to my son's crystal radio receiver (check the
circuit before you use it!)
o anything that shows that you got something to work

Some hints:
* Don't foget to *tune* your reciever. Any time you change one of your
circuits, or even move your radios around very much, you're likely to
have changed the center frequencies of your LC tanks. Make sure that
you bring them back together again. Looking at the transmit and
received signal on the scope at the same time can be very helpful as you
play with the variable capacitor.
* To make it easier to hear the speaker, use a ~1m wire on your
microphone so that you can speak into it from a reasonable distance and
not be shouting right next to the speaker.
* try putting an "aerial" (long wire used as an antenna) on your
transmit and receive tanks to get more range.

ksjp