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multiple radio use for robotics competition

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Old 04-23-2004, 09:58 AM
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Mark DiMonte
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Default multiple radio use for robotics competition

Hi all. My name is Mark DiMonte and I need some help in anticipating problems that might arrise when operating 20 different ground frequencies simultaneously during a robotics competition up here in Canada. I am the technical dirrector for Skills Canada Ontario Falcon Knight Robotics competition. We currently have 20 teams registered to compete in a task oriented challenge that may see all 20 robots running either in competition, or in the pits. The posted immage is a list of the frequencies that will be in opperation. Does anybody know any calculations that I may do in order to forcast any seccond or third order interferance that may arrise. Your help would be greatly appreciated. Thanks.
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Old 04-23-2004, 01:31 PM
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Default RE: multiple radio use for robotics competition

Second order interference happens with 2 channels 23 channels apart from each other operate at the same time, they mix and produce a signal that can affect any single conversion receiver in the range of those signals. It is only a factor for single conversion receivers and only when 2 interfering signals are strong and your signal is weak.

For third order interference, you can use this as a formula for this, though there are other harmonics that can also affect things. 2 times frequency1 minus frequency2 = frequency3. This frequency3 can be directly on a channel in use. Again, with quality equipment and equally strong signals this does not generally cause any kinds of issues.

Positioning of each source of each signal in relation to the receivers in use will also play a large factor in weather or not these possible interference sources become any type of a problem for anyone. There are many sources on the Internet that provide more information on this than what I provided by doing a search on one of the search engines. Here are a few that I have found.

http://www.jetpilots.org/scanning_fo...erence_in_.htm
http://www.bergent.net/SC-DC.pdf
http://www.greathobbies.com/document/tech_radio_1.html
http://www.repairfaq.org/filipg/RC/F_RC_Radio.html
http://www.repairfaq.org/filipg/RC/F_RC_interf.html
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Old 04-26-2004, 10:28 AM
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Default RE: multiple radio use for robotics competition

Thanks Dan. MAD out.
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