Date: Fri, 20 Feb 1998 19:20:49 -0800
From: Tim Ostrom <576587@ousd.k12.ca.us>
To: exploratorium pinhole <pinhole@exploratorium.edu>
Subject: Crystal Radio antennas
Aloha,
I have been working on a lesson where my 7th graders make crystal
radios. One radio works great < : When I hook 2 radios to the same
Antenna and I change the Capacitance (station) on one radio, the other
radio becomes out of tune without its Variable Capacitor being touched.
The only solution I can think of is to put 15 antenna wires out of my
classroom window. Is there a better way? If the 15 wires are too close
together will they interfere with each other? How long should the wires
be? I have read to use horizonal long wires. Will vertical wires work?
Any other fun and educational electronic projects you can share or books
you can let me know about would be appreciated.
Also check out this web site. It is an electronics calculator and I
have found it useful in the past < :
http://gate.cruzio.com/~rhamre/A_Electron/Electronic_Calc.htm
Thanks in advance < :
Tim Ostrom
Oakland Unified School District