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Subject: pls clarify my doubt on AM RC system. i m having oral presentation soon

Date: 02/22/03 at 1:49 PM
Posted by: janet
E-mail: janet_smith2000@yahoo.com
Message Posted:

fig. Tx


fig. Rx

can anybody tell me:

1. what is the bandwidth for the AM RC toy car normally?

2. why AM is used instead of FM in RC car?

3 Which AM they use? Ordinary AM? SSB? DSB? Vestigial Sideband?

4. for a RC car that can move forward, backward, left n right, encoder/decoder of how many bit is used?

5. (fig. TX) can u help me to determine which part is LO (local oscillator), Mixer, Amplifier, LPF, etc. by red-circle n label the picture (by paintbrush n upload or email to me)?

6. (fig. RX) how to make sure the spacing between each turn is evenly in ferrite winding(inductor)?

7. (fig. RX) can u help me to determine which part is LO, Mixer, etc by red-circle the picture?

8. (fig. TX n RX) if i want to add an encoder and decoder in Tx n Rx, which part i have to connect? (again, label for me.) thank u!

9. why the frequency the lower the better for the signal travels from air to water?

url: http://www.ajpotts.fsnet.co.uk/radiocontrol.html
my email is janet_smith2000@yahoo.com

thanks!


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