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Tanglefoot
05-08-2008, 01:00 PM
This is a demo I did for BARC Jr...the youth auxiliary of the Boulder Amateur Radio Club last week. They're the ones who got me into radio when I was 12. I feel 12 again whenever I go back.

The generator is from windstream power. It's pretty stout...there's plenty of power available even with the bike tire spinning slowly in low gear. The rack was assembled by Team Empower as a contest entry from CU engineering school.

There's a 7AH gel-cell after the generator so that the bike doesn't have to be going all the time.

The radio's a Yaesu FT-840. We ran the output power between 20-50 watts.

The antenna's a Hustler mobile whip attached to a music stand tripod with speaker wire ground radials cut for the various bands.

There was a great contest going on on 20-meters that made for some exciting, fast-paced contacts.

Everything was designed to be packed up and carried by the bike and trailer. I was going to ride it down from atleast Louisville but I didn't have enough time and just drove in instead. *lame*

Photos are courtesy of Rip/NV0M

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Hulk
05-08-2008, 01:11 PM
Pretty cool. Looks like they used mostly off-the-shelf parts to create the rack. Do you have any close-up pictures of the generator assembly, battery, etc.? I might want to make one of these!

60wag
05-08-2008, 01:58 PM
The generator looks a lot like a Dayton DC motor.

Tanglefoot
05-08-2008, 02:22 PM
It's probably about the same thing. It's this one:

http://www.windstreampower.com/443541_PMDCG.php

You can probably use other DC motors/gens.

The battery's one of these:
http://www.amazon.com/FB12-7-Batteries-com-Sealed-Lead-Battery/dp/B00099DV30/ref=sr_1_2?ie=UTF8&s=electronics&qid=1210274734&sr=8-2


I'll try to get some pictures of the generator rack.

Eric

nakman
05-08-2008, 03:03 PM
That's really cool.. so it looks like for ~$300 in parts I could take an old bike and make a stationary bike capable of powering something that needs 3-10amps at 12 volts? Anything from a radio, to portable TV, or a fridge... And for that matter I could probably make my own windmill... hmm..

leiniesred
05-09-2008, 10:30 AM
That's cool. the average human on an upright bike can average 50watts for 24 hours.

World class bikers can do about 200watts for 24 hours.
World class bikers can do 1 horsepower for about 30 seconds.