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4 votes

Why is WiFi increasing frequency?

why not scrap all the obsolete bands and reassign the 1 GHz - 6 GHz range to WiFi? First of all, these bands are not obsolete, there are many uses that might seem outdated, but won't go away easily. ...
Eirik M's user avatar
  • 141
3 votes
Accepted

High frequency TIG welding and Bluetooth or WIFI frequency

Don't worry about the frequency of the applied power. Worry about the fact that a spark gap is a fairly efficient way (and can be a really efficient way) of generating radio frequency radiation. It'...
TimWescott's user avatar
  • 2,682
3 votes

Interference between direct signal and reflected signal

Wifi uses Orthogonal frequency-division multiplexing (OFDM). OFDM is resilient to delay spreading which essentially is multipath RF signals or signal bouncing off walls per your question. Here is ...
Mahendra Gunawardena's user avatar
3 votes
Accepted

Send sensor signals to WiFi network

I would keep the sensors passive as transponders to a house wide rfid radar scanner. Changes in the sensor would change the code on the rfid of the sensor, thus reflecting back a different ...
0tyranny0poverty's user avatar
2 votes

Send sensor signals to WiFi network

I think you won't get this done without some kind of processor and customized firmware to convert the sensor signal to a digital signal for WiFi transmisson. The dongle is a good idea, but it provides ...
bunto1's user avatar
  • 151
2 votes

RFID vs. Bluetooth vs. Wifi beacon

Some thoughts on your options: RFID, as you stated, likely won't work, most certainly not over 20 meters as low power devices, that's not what it is designed for. Bluetooth and WiFi would work with ...
bunto1's user avatar
  • 151
2 votes

A 40MHz oscillator in usb wifi adapter

Generally when you need to scale up a clock you use a PLL (Phase lock loop). A very crude explanation is that you have a voltage controlled oscillator at roughly the required frequency. You divide ...
Andrew's user avatar
  • 766
2 votes
Accepted

Why is Li-Fi faster than regular wifi?

The wave propagation speed is only relevant when you start approaching the theoretical limit of that type of wave's ability to transmit information. For an analogy, consider people having a ...
Air's user avatar
  • 3,211
2 votes

Can wifi signal reception be improved by opening a door?

I live in a big old 1920s built house. The bedroom is one floor above the router, and one room adjacent. The floors in my house are wooden, the walls are stone, the cielings are high and the doors ...
DrLazer's user avatar
  • 121
1 vote
Accepted

In Elevator Phone Connectivity Reuirements ASME 2019 is WIFI bridging Acceptable?

The standard seems to specify 2-way communications, with requirements for testing, alternate power, etc., but does not specify how that should work. There are a lot of requirements there, but they ...
Tiger Guy's user avatar
  • 6,969
1 vote

High frequency TIG welding and Bluetooth or WIFI frequency

I may be missing something important, but both Bluetooth and Wifi operate in the >GHz bands. With 1MHz you shouldn't remotely get any impact. That only true of course, if the welding machine does ...
Ingo's user avatar
  • 171
1 vote

What emits more radiation, cell network or wifi?

So, after a little googling around. Cellphones typically transmit on 3/4 G at between 0.3 and 3 W - subject to tower location & interference. The out put power is managed by the cell tower. ...
pHred's user avatar
  • 176
1 vote

Why channel 1, 6 and 11 are best for Wifi communication 802.11n?

All channels good but: National standards can control some parameters (gain, numbers of channels, gain in channel ...). Gain of Channel 1 can be less in some cases. I have 19 visible ssids in my ...
dash1121's user avatar
1 vote

Send sensor signals to WiFi network

The cheapest option for you to consider would be to use Esp8266 modules. They technically cost 1 USD. You can import a bulk (lot) order from aliexpress to make it cheaper. For you command centre you ...
Sanketh Rajendra's user avatar
1 vote

Is it possible to "boost" a WiFi signal using an aluminum soda can?

It is too small a surface area to be an effective microwave reflector. The shape is wrong too, it must be parabolic with respect to the transmitting fractal antenna of the router. Yours is ...
0tyranny0poverty's user avatar

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