http://www.fightingrobots.co.uk/documents/emi.pdfhttp://www.fightingrobots.co.uk/documents/emi.pdf
10 nf max across between the motor terminals ...page 4 / 5
There is LOADS of other info in the document that should help you solve your problems.
Not quiet true Grant only for RoboGames and Combots.
try moving the antenna more outside the robot.
tried that and placed the receiver anywhere i could inside and out, the only place i have not tried is putting it where the sun dont shine.
if i dont get no joy fitting a capacitor to the motors i will see if i can get a spektrum DX6
Thanks for all your replies
ROB....
What is the overall length of your ariel? If memory serves it should be about 40cm long.
its aprox 83cm long
BAD memory Ed.
The correct calculated length for a 1/8th wavelength 40Mhz R/C antenna is I believe 89cm ... 1/4 wave being 178.3cm.
Robert can you do a range check with the receiver OUT of the bot and working just a servo?
(Message edited by woody on August 05, 2007)
Well I was 1/2 right. Anyway 89cm is an impractical length.
89cms impractical? Try a full wavelength antenna, now thats impractical.
On the subject of reception in Roberts robot: Try
shielding of the antenna on the inside of the robot, the external antenna is fine, but if the antenna that is left on the inside picks up noise from everything in the robot that good signal has less a chance of coming through.
We shielded out antennas in the past (before we went to 2,4GHz) by using coax cable for ethernet (RG-5, the antenna in the middle, and a nice wiremesh shield around it to stop outside interference. It helped a lot.
also, shorten the distance between external antenna and reciever if possible, you antenna length is now effectivaly longer then its regular length because you need to add the length of the outside antenne with the inside. if the outside antenna is already tuned for 40MHz, you should only have something like 10 cm on the inside.
Robert can you do a range check with the receiver OUT of the bot and working just a servo?
yes woody and the range was 10 paces.
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