3 ms·
Why are they able to be able to get so much more range out of this product than regular Wi-Fi is able to get?
by biturd 13y ago
Why are they able to be able to get so much more range out of this product than regular Wi-Fi is able to get?
- lutusp 13y agoMuch higher radio power level.
- TaylorAlexander 13y agoactually not at all, we have less TX power than most wifi devices. The data rate is inversely proportional to range, as is the frequency. We operate at a lower frequency than wifi (915 MHz), and a much lower data rate (your Arduino probably does not need a 100Mbps connection). This gets us range without blasting people with radio or having trouble with the FCC.
- lutusp 13y ago> actually not at all, we have less TX power than most wifi devices. Another post in this thread says 16 mw, compared to about 50 mw for an 802.11 class device, so that's rather low and I'm somewhat surprised by the range claims. I suspect the chosen antennas play an important part. > The data rate is inversely proportional to range, as is the frequency. Unless I have misunderstood the above sentence, it implies that the range increase as the frequency drops. In a word, no, because among other things, thermal noise increases as frequency drops. A low data rate will buy you more range, but range doesn't increase as frequency drops. > This gets us range without blasting people with radio or having trouble with the FCC. Maybe. It turns out that 915 MHz is a pretty busy area of the spectrum in many places -- successful communication might be harder in practice than the ideal case.
- rauar 13y agoLower bandwidth... and from one other comment they could be using lower frequencies as well.
- walshemj 13y agowifi can do 1km easily just use more tx power and a suitable antennas.