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MyLaps update killing MRT, AMBrc DP and house transponders!

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MyLaps update killing MRT, AMBrc DP and house transponders!

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Old 06-04-2018, 05:22 AM
  #166  
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These lap counting systems use frequencies many orders of magnitude lower than Bluetooth. That's because the reception of the transponder signal is intentionally done in the near field, via induction. The signals are strong only very close to the receiving loop, and die out quickly as distance is increased. That makes it relatively simple to determine when the transponder is passing under or over the receiving loop.

At higher frequencies, reflections can cause signal strength to peak even when the distance between transmitter and receiver is not at a minimum. That would cause false lap timing.
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Old 08-30-2018, 03:08 PM
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Originally Posted by windellmc View Post
AMB invented this tech in the 80s. So that patent is expired. That is how mrt was making transponders. MYLAPS has a 2012 patent which is good for 20 years and I would bet there is something in the rc4 transponder that is patented that keeps mrt from making full rc4 compatible transponders. Now the switch has been flipped to disable rc3 and rc2 compatibility in rc4+ decoders.

Someone will have to make a decoder that copies the rc2/3 and it won’t work with non hybrid rc4 transponders. Who is going to pay for that? Better to figure how to hack the rc4 decoder and fix the firmware.
We use Vostok timing system, which works with all transponders except "pure" rc4. On our country peoples do not hurry change their transponders to newest rc4.
So you can use cheaper MRT transponders or used AMB/Mylaps rc3 transponders from Ebay........
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