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how can i build a 25mtrs sender / reciever..???

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sorry

i need to make a wireless trigger system...

the sender is placed near a street

then the reciever passes and just recieves a signal and start counting

its for laptiming..

soow we need a radio signal...

for accurency i wanted to measure the signal strengt...

And @ it highest peak i want to trigger the stopwatch...??

TKS
 
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