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Art Vandelay (Pujolsrules)
New member
Username: Pujolsrules

Post Number: 1
Registered: 5-2010
Posted on Saturday, May 29, 2010 - 6:01 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

Before I start, I know about the legalities of transmitting on certain frequencies and what licenses you need, etc...

I want to use the transmitter in an outdoor setting for a receiver 50 feet away. I need to connect the ground pin to a good ground. Could this be achieved by sticking the ground wire in the dirt?
...or, is there another am circuit that would do the job?
I've done some googling, but am unsure.

Thanks all.
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Theresa Simmons (Theresa)
Senior Member
Username: Theresa

Post Number: 162
Registered: 1-2008
Posted on Saturday, May 29, 2010 - 8:00 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

The scitoys circuit is designed to be easily put together
by school children, and still be low enough power to be legal.

If you need longer range, a good ground (not a wire stuck in
the dirt, but a copper pipe buried deep enough to always be
damp and long enough to have a low resistance contact with the
earth) will help, as will a long antenna (50 to 100 feet).
A cold water pipe is usually a good ground. Hot water pipes
are not buried, but cold water pipes are.

There are other, more complicated circuits that can also give
you longer range:
"http://www.bowdenshobbycircuits.info/page6.htm#amtrans.gif"
"http://www.electronic-circuits-diagrams.com/radioimages/5.gif"
"http://www.techlib.com/electronics/amxmit.htm"
"http://www.zen22142.zen.co.uk/Circuits/rf/amtx.htm"
"http://www.circuitstoday.com/am-transmitter-circuit"
"http://www.antiqueradio.org/transmitter.htm"

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