FWIW: VARA adopted the AMB transponders a couple of years ago. I know several
racers including me that had problems with the hard-wired model. I believe
they are very susceptible to current fluctuations. Happily I was able to
trade for a re-chargable unit and have had no problems. A fully charged unit
will run for 3+ days. Just remember to add "charge transponder" to your T-1
day pre-race checklist. The cigarette lighter (oops..accessory plug-in)
charger doesn't seem to do the job during the tow to the track.
John Frymark
VARA #67 TR4A
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