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Tandem Cycling A bicycle built for two. Want to find out more about this wonderful world of tandems? Check out this forum to talk with other tandem enthusiasts. Captains and stokers welcome!

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Old 03-23-05, 09:36 PM   #1
Bone
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Problem with stoker's computer-too far from sender??

Gang,
I've been looking for a computer for my stoker (wife). I am currently running a Flight Deck on the front, as well as on my DF. I figured if I was going to add an additional computer I should pick one with a few options I am lacking on the Flight Deck and have wanted for some time. Specifically, vertical feet climbed and percent grade. Today after my ride I went out and picked up a Specialized Turbo Pro. Got it all programmed and low and behold it is not picking up the signal from the sender. The manual recommends 28 inches as the maximum distance between the two, so I placed the magnet and sender on the back wheel to just keep it under the maximum. It is now at 27 inches. If I hold the computer 6-12 inches from the sender it works fine. Now I'm sitting her pondering my options. I could mount the computer in the top tube just in front of the seat to shorten the lenght, but that seems kind of hokey. Possibly the battery is a bit weak, I could try another. Has anyone ever added an "antenna" to the computer? Is anyone aware of another computer with the altitude functions that runs a wire from the sender? That might be my best bet.
Thanks. Bone
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Old 03-24-05, 10:15 PM   #2
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There's another thread around that address this issue. We settled on a GPS and HRM for the stoker. You'll find the solution for your problem in the old thread.
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Old 03-25-05, 07:36 PM   #3
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23.5" is about the limit for any of the Specialized / Ciclosport / VDO wireless units (all seemingly made by the same company). I've used both the Specialized and Ciclosport models and still have a Ciclosport CM414Ati & a HAC4 that I use on our tandems, but only up front.

Polar's high-end units are good for nearly 30" with the jumper in the "long range" setting on the sensor/transmitter; however, they only collect altitude. However, on the bright side, they are first and foremost HRMs and will support downloading your ride info to PC via an infrared port. Debbie has an S720i on the back of the tandems.

There were Alti units from Avocet & Cateye units that wired-on to the bikes; however, the Avocet 50 went away a long time ago and only a few NOS Cateye AT100's are still around. The last time I saw them offered was at Lickton's for about $70 and I just checked Ebay where I found someone selling 5 of the AT100's for $53/ea. http://cgi.ebay.com/ws/eBayISAPI.dll...category=30108

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Old 03-26-05, 10:51 PM   #4
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Guys,
Thanks so much for the replies. I was unable to find a wired computer with the features I was looking for, so I decided to fabricate an aluminum bracket to fit the top tube. It works like a charm. My wife looks straight down frequently while pedaling so it is right in her line of sight and does not interfere with her legs, getting on or off the bike. If anyone needs to see more pictures let me know and I'll send them to you.
Thanks again. Steve
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