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Q&A


Welcome to www.norad4u.com Questions and Answer page. In this page we will update questions that were asked by readers via our email (norad4u@gmail.com) and were answered by  No Rad. We hope that when reading this page some of your questions will also be  answered. Please feel free to contact us with more questions.

  

Q - In which frequencies cellphones operate?

A - first generation - ~800Mhz, 
second generation - ~1.8 Ghz
Third generation -~2.1 Ghz.
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Q - What kind of Electromagnetic radiation (EMR) is emitted from Cellphones?

A - RF (high frequency) EMR, Electric field and also Low frequency (LF or ELF) magnetic field.

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Q - What is the best way to use a cellphone?

A - Regarding a cellphone, this is the list from best to worst (not for EHS persons):

  1. Land line wired phone.
  2. Wired Airtube earpieces when the cellphone is placed as far as possible from the body.
  3. Wired earpieces when the cellphone is placed as far as possible from the body.
  4. Speaker phone when the phone is 1/2 meter from your head.
  5. Bluetooth earpieces when the phone is 2 meters from you, and if you turn the earpieces off when the conversational is over.
  6. Wired Airtube earpieces when the cellphone is placed in your pocket.
  7. Wired earpieces when the cellphone is placed in your pocket.
  8. Bluetooth earpieces when the phone is in your pocket, and if you turn the earpieces off when the conversational is over.
  9. Bluetooth earpieces when the phone is in your pocket, and when the earpieces is on your ear and turned ON all the time.
  10. A Cell phone next to your ear.
Numbers 9 and 10 are the worst, it is hard to say which one is better.
For more info on this issues please see: http://www.norad4u.com/emr-reduction/using-the-mobile-phone
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Q - Which cellphone is best to use in the car?

A - a fixed car cellphone with an external antenna.
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Q - Do cellphones emit EMR when in standby mode?

A - Yes, in the following cases: 
  • most cellphones will communicate to the closest base station (antenna) and will report their status once in a while. 
  • If you receiver emails or SMS messeges to your cellphone, this will result in a transmission and emission for several seconds when the messages are received or when the phone sync with the network.
  • If you have a third generation cellphone or a smart phone and you run applications that access the web, your phone will transmit and receive data from the cellulare network and will emit EMR will doing that.
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Q - How can I limit my EMR exposure?

A - Your exposure depends on the levels and time of exposure. In order to limit your exposure you need to reduce both. Reducing the levels can be done by putting more distance between you and the source (a cellphone for example) and by using a device that emit less EMR. In addition it is very impotent to limit the use and to minimize your time on the cell phone and around other EMR sources.

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Q - Is it safe to use Power line networks? 
A - Power line  networks is a technology in which the PC network is embedded onto the electric power lines inside the house. I think Power line  networks technology is much better than WIFI (as far as EMR is concerned) but it produce some Dirty Electricity (low-mid frequency single over the power line). The best thing to do (as far as EMR and speed is concerned) using CAT5 or CAT6 network cable is the best way to go.

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Q - Do wired (usb, microphone) ear pice emit radiation, compared to a bluetooth ear pice?


A - In general wired equipment emit no Radio Frequency (RF) Electromagnetic Radiation (EMR). It may however emit some Low frequencies.
When connecting to a cellphone some of the RF EMR may makes it way up the wire and to you ear/head.
Compared to a Bluetooth earpiece, I would se wired earpiece any time. 
Bluetooth emits RF EMR all the time it is coupled with the cellphone (which does the some, emitting RF EMR when coupled with a Bluetooth earpiece.

Please see the following clips:

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Q- Why is it so complex to measure RF radiation from cellphones?


A- Most RF meters actually measure electric field (in V/m2 units) and then calculate the RF levels (in mW/m2 or uW/cm2).
This calculation is possible and correct only if done in the far field.
Therefor if you use a RF meter to measure RF from a cellphone right next to it you will not get the right levels.
What you can get is an indication that there is radiation (and this is what I try to show in my videos).
In order to measure the RF from a cellphone you need to measure it in the far field and then to calculate the levels that are next to the phone.
An other may to do it is to use electric field meters (I have 2 and in some of the videos I use them).
But this is not the end of the story.
Cellphone emit high RF radiation in high frequencies (most of the times more then one frequency) but also low frequency electric and magnetic fields.
You need also to measure them and to take them into consideration.
Measuring all the levels in all the frequencies emitted by a cellphone is very problematic and very complicated.

Please see the following videos:

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