Reduce/increase radiation according to use

Discussion in 'Tomato Firmware' started by airwolfke, Apr 14, 2017.

  1. airwolfke

    airwolfke New Member Member

    I was wondering if it's possible to reduce the radiation of the router, I was thinking something like this:
    - No devices connected to wifi: Lowest possible radiation, just enough to pick up the signal on a ipad/laptop/smartphone
    - When device is connected: Emit/power radiation according to what is needed. For whatsapp message that comes in: low. Downloading a big file: high radiation, as soon as file has stopped lower it again.
    Surfing the net: high radiation

    So instead of having a constant flow/stream of intensive radiation put it low and increase it when it's needed...

    Any thoughts how this is possible?
  2. WaLLy3K

    WaLLy3K Networkin' Nut Member

    It’s important to note that there are two types of radiation: Ionising and Non-ionising. The former, while having practical uses such as Tanning Beds and Medical X-Rays, can cause burns, radiation sickness, cancer and genetic damage. Non-ionising radiation, however, merely has the ability to make things warm. Practical uses include radio transmission (CB, AM/FM radio, TV and WiFi/Cellular), microwave ovens and heat lamps.

    To provide a real world example, a standard Microwave Oven will focus 1000W of electromagnetic non-ionising radiation into a single point in the centre, where it may take around 20 seconds to warm a cup of water, or 10 minutes to cook a potato.

    Compare the microwave to standing in front of a cellular tower (which, like all radio transmission, have regulations in place to restrict transmit power): you will be able to measure anywhere between 2 to 120W of output. WiFi is on an even smaller scale, where it will only transmit at a mere 0.04W when actively transferring data

    TL;DR: There's no point in changing the output WiFi power for health reasons, due to it being non-ionizing (non harmful) radiation.
    rs232, Monk E. Boy and AndreDVJ like this.
  3. airwolfke

    airwolfke New Member Member

    Thank you very much for your input.
    It's not my goal to start a thread about if it's harmful or not.

    My question is simply can it be done?
  4. remlei

    remlei Networkin' Nut Member

    I dont think any wifi radio is smart enough to do what you want. except if you do it with scripts or a separate program that control the thing, but I think this is pointless.

    If youre concern about health impacts of a radio signal, then you dont have to worry, without any scientific evidence you shouldnt be believing in any random youtube video out there. You have to literally match the power of a microwave oven to cook your body and a mere <1w of wifi radio power, I think its highly unlikely to burn you alive.

    you can also use the access restriction to turn off your wifi in certain times eg every midnight to early 6am.
  5. AndreDVJ

    AndreDVJ Addicted to LI Member

    Even with scripts, settings to the wireless driver are not dynamically applied, only disruptively applied.

    Further elaborating, any change to any Wi-fi setting will cause the wireless driver to be restarted.

    So there's no way to achieve that with Tomato firmware. If you're really looking for a device that can dynamically adjust transmit power, a more specialized device is required.
  6. rickmav3

    rickmav3 Serious Server Member

    Simple answer: yes, TURN OFF THE ROUTER! Also throw away your cell phone, tablet and every wireless device and put a tin foil hat on your head!
    gffmac likes this.
  7. Monk E. Boy

    Monk E. Boy Network Guru Member

    Even if you somehow changed the router to dynamically change its power setting, all it takes is someone driving by with a WiFi enabled car or their phone in their pocket or the kids in the backseat with tablets beaconing for any available WiFi access point for your router to ramp up the transmit power to try and communicate with them. Even if you're in the middle of a 25 acre plot of land, so you have no cars traveling within range (although planes could still be an issue), all your devices need to be modified to work similarly to the router otherwise it's kind of pointless to have them transmitting at full strength and your router transmitting weakly.

    You would need access to the source code of the wifi drivers to modify them to work this way. OpenWrt does have some open source drivers although their support is still evolving and only older models really have solid hardware support. Hopefully you have a good understanding of the SoC'sn wifi module and the language the drivers are written in.
  8. ruggerof

    ruggerof Network Guru Member

    Simple answer: not with Tomato.
  9. Techie007

    Techie007 Serious Server Member

    An even simpler answer: To an extent, this is already being done. Unless there's data being actively transferred, only beacon frames are transmitted in the first place, thus reducing the amount of RF energy being emitted to almost nothing. You can lower it even more by increasing the beacon timer period from 100ms to 1000ms. Conversely, when data is being transferred, the radio transmits intermittently as needed.
    Justio likes this.
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