General Question

grrgold's avatar

Is there a low cost way to repeat a 2.4Ghz signal?

Asked by grrgold (88 points ) May 21st, 2010

I own a small gym where I have installed a heart rate monitoring system. Participants wear a belt around their chest that transmits their heart rate to an antenna that is hooked up to a computer. According to the manufacturer, the belts transmit at 2.45GHz (between WLAN channels 11 and 12) . There are certain points in my facility that the signal drops off from the system. I believe this is because there are too many walls in the way.
Is there a device available that would pick up the 2.45GHz signal from multiple heart rate monitors and repeat it or amplify it so that it can reach the system’s antenna?

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7 Answers

Tropical_Willie's avatar

Buy a wi-fi repeater. Should work—it is the same band a 802.11g. The trick to make sure it works is to borrow a repeater. Some repeaters can also be used as primary wi-fi network so someone you know may one to lend you for a trial.

grrgold's avatar

@Tropical Wille – wouldn’t the wi-fi repeater only repeat those signals that it identifies as being 802.11g? in other words, since i am not attempting to repeat a network message, won’t it throw it out as “noise” and not repeat it?

Tropical_Willie's avatar

That’s the reason I said to try it out.
But 2.45 is 802.11g wi-fi and I am not an engineer but your monitors are one way wi-fi transmitters to my thinking.

Buttonstc's avatar

I once did some research ok homemade antennas for boosting signal strength.

The techno part of it was way over my head, but I really found the idea fascinating.

You sound pretty knowledgeable about electronics so youay me able to benefit from it.

I know the name sounds a bit off but…

Just Google Cantenna or Can-tenna and it will give you multiple sites with full pics and instructions.

( I didn’t really save them ok bookmarks and I can’t do links from iPhone, otherwise I’d post them. )

jerv's avatar

Ah yes, the infamous Pringles can! It’s a little tricky to do correctly, but it does work and it is cheap.

Buttonstc's avatar

Actually, from what I’ve read all types of cans can be used.

I would need help from a friend of mine who has an engineering background (also an Annapolis grad) cuz I’m pretty dimwitted with techno stuff.

However, my reading comprehension is fine so I figured it would work.

And, he did request cheap :)

jerv's avatar

@Buttonstc Correct, but most of the ones I’ve seen used the Pringles can for some reason.

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