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Old 2021-06-22, 15:27   #375
PhilF
 
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Feb 2005
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I have some more dirt on treadmills (no pun intended).

Most use a DC motor that is pulse width modulated for speed control. The DC power is supplied by a switch mode power supply.

These motor pulses are square waves, rich in harmonics. Left unfiltered, they are injected into the power line which pollutes the surrounding RF environment with very nasty noise that can extend up to 100's of MHZ, with the power line acting as a transmitting antenna.

The treadmill industry, for some reason, has decided to ignore this issue so they leave their power supplies completely unfiltered. Some are so bad that my neighbor's high-end, expensive treadmill would knock my DSL service out whenever it was in use. I had to purchase an expensive external filter and plug his treadmill into it in order to fix the problem.

So why add $5 worth of parts to each treadmill, right? Let the poor unsuspecting customers fight with troubleshooting all the interference we cause...
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Old 2021-06-22, 15:36   #376
retina
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Quote:
Originally Posted by PhilF View Post
So why add $5 worth of parts to each treadmill, right?
Many countries have emission regulations that would ban such products, and put the sellers at risk of prosecution if they ignore them.

Maybe you can talk to your politicians about getting some regulations to cover things like that.

That is, assuming they aren't too busy taking backhanders from the makers to keep the laws more lax.
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Old 2021-06-22, 15:54   #377
PhilF
 
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Quote:
Originally Posted by retina View Post
Many countries have emission regulations that would ban such products, and put the sellers at risk of prosecution if they ignore them.
We have plenty of said regulations, we're full up lol. But why they don't seem to apply to the treadmill industry is beyond me.
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