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Question #: 255

Question: COULD YOU PLEASE EXPLAIN, IF IT'S TRUE, THAT HANDS-FREE CELL PHONE CAR MICROPHONES RADIATE MORE THAN ANY OTHER INSTRUMENT USED WITH THESE PHONES?

Current Solution

Hands-free cell phone car microphones have been tested by the manufacturers and meet the current ANSI/IEEE (American National Standards Institute/Institute of Electrical and Electronics Engineers) standards for radiofrequency (RF) safety. These are the same standards that the Federal Communications Commission enforces under the Telecommunications Act of 1996, and they place limits on the specific absorption rate (SAR) of RF energy in the body. Recent inflammatory articles in the British press were not substantiated by testing at ISO-accredited testing facilities at Motorola. Manufacturers of cell phones are required under FCC regulations to assure that their products meet the SAR limits on both hand-held and hands-free units. Further information can be obtained on the Internet at The Center for Devices and Radiological Health (FDA information) or Office of Engineering and Technology (FCC information).

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Other Possible Solutions to this Question

  • HOSPITALS DO NOT ALLOW CELL PHONE USE DUE TO POTENTIAL INTERFERENCE. LAST WEEKEND I WAS IN A HOSPITAL WHERE THE TOP OF BUILDING STUDDED WITH TOWER ANTENNAS. WHY IT THAT PHONES WOULD CAUSE INTERFERENCE, BUT ANTENNAS NOT?

    It's a question of signal strength. Interference has been observed only very close to transmitting antennas where there is strong signal strength. Interference has been observed in some medical electronics due to hand-held cell phones. Roof-top antennas are some distance away from any susceptible electronics. In addition to proximity, the directionality of the antennas is important. Most rooftop antennas have strong gain in the forward direction—towards the horizon—and very low gain in the vertical direction. Finally, there are layers of building materials shielding the interior areas from the rooftop antennas. Proximity, directionality, shielding—all go towards reducing the signal strength inside a building due to the antennas on the roof so that interference is not generally an issue. This does not mean that you cannot receive the signals from the roof top antennas inside the building; it simply means that the received signals are not strong enough to cause interference. Gary H. Zeman, ScD, CHP

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    HOSPITALS DO NOT ALLOW CELL PHONE USE DUE TO POTENTIAL INTERFERENCE. LAST WEEKEND I WAS IN A HOSPITAL WHERE THE TOP OF BUILDING STUDDED WITH TOWER ANTENNAS. WHY IT THAT PHONES WOULD CAUSE INTERFERENCE, BUT ANTENNAS NOT?

  • I'VE BUFFERED A PWM SIGNAL TO 0-10V ANALOG AND I WOULD LIKE USE THAT RUN YOUR 110V 2.2KW SPINDLE VFD. COULD YOU PLEASE DETAIL THE CORRECT WIRING VFD SETTINGS GET WORKING?

    This will depend on the VFD you have to identify the correct terminal. The terminal on the VFD will be labeled AI1 typically (Analog Input #1). You will also need to make sure to complete the PWM circuit using the GND terminal on the VFD.

    Additional Information:
    I have wired my 0-10V signal to the AI1 and GND terminals as suggested. I have also set the PD-01 and PD-02 settings to 1. Still nothing. Is there something else that I am missing?

    Additional Information:
    Thanks for the information. Can you let me know the model of the VFD that you have?

    Additional Information:
    VFD Model # YL600-2S-2K20

    Additional Information:
    Thanks. I will check our resources and documentation to see if there is another programming setting that needs to be changed.

    Additional Information:
    Does your VFD have a VI terminal?

    Additional Information:
    No, it does not. The terminals for this VFD are as follows (seperated by dashes "-").

    10V-AI1-AO2-PLC-DI5-DI3-DI1-COM
    AI2-GND-AO1-DI6-DI4-DI2-FM-24V

    Additional Information:
    Do you have a PD070 parameter?

    PD070 is the main Analog Input parameter.

    The options for that parameter is:
    0: 0-10V
    1: 0-5V
    2: 0-20mA
    3: 4-20mA
    4: 0-10V (4-20mA Stacked)
    5: XIA
    6: (VI+XIA)/2
    7: (3VA+XIA)/4
    8: (XIA_XIB)/2
    9: Max (XIA, XIB)
    10: Min (XIA, XIB)


    Additional Information:
    There is a PD-00 thru PD-09. PD-07 is currently set to 0.

    Additional Information:
    It appears that the manual I’m using “Titled YL600” is not the same as your unit. I will check our manuals and find the one that has only PD-00 to PD-09.

    Additional Information:
    For that VFD, the parameters are P0. The 0 may look like a D on the display.

    The parameters that need to be changed for the AI1 to work (Brackets [] around the correct selection):

    P0-01: First Motor Control Mode
    - 0: Sensorless Vector Control
    - 1: Flux Vector Control (FVC)
    - [2]: V/F Control

    P0-02: Options of Command Source
    - 0: Operation Panel Command Channel (LED will be off)
    - [1]: Terminal Command Channel (LED will be on)
    - 2: Communication Command Channel (LED will flicker)

    P0-03: Options of Principle Frequency Source X
    - 0: Digital Setting (Preset Frequency P0-08, UP/DOWN modifiable, no power-down memory)
    - 1: Digital Setting (Preset Frequency P0-08, UP/DOWN modifiable, with power-down memory)
    - [2]: AI1
    - 3: AI2
    - 4: AI3
    - 5: Pulse Setting (DI5)
    - 6: Multi Speed Instruction
    - 7: Simple PLC
    - 8: PID (Proportional Integral Derivative Control)
    - 9: Communication Given

    P0-11: Upper Limit Frequency Source
    - 0: P0-12 (Make sure the P0-12 parameter has the correct max frequency if used)
    - [1]: AI1
    - 2: AI2
    - 3: AI3
    - 4: Pulse Setting
    - 5: Communication Given

    P0-27: Command Source Bundle with Frequency Sources
    Single Digit: Options of Operation Panel Command Bundle with Frequency Sources
    - 0: No Bundling
    - 1: Digital Setting Frequency
    - [2]: AI1
    - 3: AI2
    - 4: AI3
    - 5: Pulse Setting (DI5)
    - 6: Multi Speed Instruction
    - 7: Simple PLC
    - 8: PID
    - 9: Communication Given
    Double Digit: Options of Terminal Command Bundle with Frequency Sources
    Hundred Place: Options of Communication Command Bundle with Frequency Sources
    Kilobit: Options of Automatic Operation Bundle with Frequency Sources

    P2-09: Upper Limit Source of Lower Torque Under Speed Control Mode
    - 0: Function Code P2-10 Setting
    - [1]: AI1
    - 2: AI2
    - 3: AI3
    - 4: Pulse Setting
    - 5: Communication Given
    - 6: MIN (Al1, Al2)
    - 7: MAX (Al1, Al2)
    - Maximum range for options 1-7, accords with P2-10

    If you elect to use a different AI#, then configure the parameters (P0-03, P0-11, P0-27 and P2-09) accordingly.

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    I'VE BUFFERED A PWM SIGNAL TO 0-10V ANALOG AND I WOULD LIKE USE THAT RUN YOUR 110V 2.2KW SPINDLE VFD. COULD YOU PLEASE DETAIL THE CORRECT WIRING VFD SETTINGS GET WORKING?

  • IT LIKELY THAT CELLULAR PHONE USAGE COULD EFFECT A CHANGE IN 400 MHZ NMR SPECTROMETER'S MAGNET IF HAS DECENT SHIELDING (TOP-OF-THE-LINE SHIELDING, CA. 1992)?

    Some electronic equipment has been shown to be sensitive to radiofrequency interference from cell phones. I suggest you talk with the manufacturer of the spectrometer for information about it.

    Gary H. Zeman, ScD, CHP

    Click the link to add information to this solution:
    IT LIKELY THAT CELLULAR PHONE USAGE COULD EFFECT A CHANGE IN 400 MHZ NMR SPECTROMETER'S MAGNET IF HAS DECENT SHIELDING (TOP-OF-THE-LINE SHIELDING, CA. 1992)?

  • WHAT EFFECTS OF CELL PHONES WILL THERE BE ON YOUNGER PEOPLE OPPOSED TO OLDER PEOPLE? THE AGE OR STATE DEVELOPMENT EFFECT DANGERS A PHONE?

    Physical size of the subject affects the fraction of the total radiofrequency energy that is absorbed in the body. To account for this known effect, the maximum permissible exposure standards for radiofrequency energy were set for the worst-case condition, that is assuming the body size for maximal absorption at a given frequency. Thus the maximum permissible exposure standards are fully protective for bodies of different sizes. For more detailed information, see the answers and the cited references to questions 79, 109, 694, and 893 under the Nonionizing Radiation section of the Health Physics Society Ask The Expert Web page. Gary H. Zeman, ScD, CHP

    Click the link to add information to this solution:
    WHAT EFFECTS OF CELL PHONES WILL THERE BE ON YOUNGER PEOPLE OPPOSED TO OLDER PEOPLE? THE AGE OR STATE DEVELOPMENT EFFECT DANGERS A PHONE?

  • ARE THERE PRODUCTS AVAILABLE TO THE GENERAL PUBLIC THAT CAN BE PURCHASED PROTECT CELLULAR OR PORTABLE TELEPHONE USERS FROM RADIATION? IF SO, WHERE THESE FOUND?

    There are a number of opportunistic gadgets on the market to allegedly protect the user from hazards of cellular phones. You can search the Internet to find the latest, ranging from antenna shields to whole-body shielding materials. Most experts believe that these devices take advantage of customers' misunderstanding and unfounded fears to sell products with no real value. First of all, cell phones that operate within the guidelines established by national and international safety panels have never been shown to pose a health risk to the user (see answers to other questions on cell phone safety on this website). Secondly, placing any kind of shield over the antenna of a cell phone will in most cases cause it to increase its RF output as it attempts to compensate for signal loss in the shield and maintain a quality phone call. The U.S. Food and Drug Administration published an advisory on cell phones several years ago that said if you are concerned about risks of using a cell phone, then simply use it less. That is still good advice today. Gary Zeman, ScD, CHP Lawrence Berkeley National Laboratory

    Click the link to add information to this solution:
    ARE THERE PRODUCTS AVAILABLE TO THE GENERAL PUBLIC THAT CAN BE PURCHASED PROTECT CELLULAR OR PORTABLE TELEPHONE USERS FROM RADIATION? IF SO, WHERE THESE FOUND?

  • I HAVE NOT SEEN ANY REFERENCES TO ENCODER FEED-BACK CAPABILITY IN OF THE HARDWARE YOU SELL. THIS A SUPPORTED FEATURE WITH HARDWARE/SOFTWARE SELL?

    I haven't delved into using encoders with stepping motors too much. From my research, you need to have a controller that can provide the closed loop control, rather than software handling that process. I have also found from my research that using encoders on stepping motors is generally used to stop the machine in the case that the motor failed to achieve the commanded position for some reason and gives the user the chance to correct and continue with the job.

    If you want proper closed loop control, it may be best to go with servos and servo controller that provide the closed loop control within the real of those two components.

    Click the link to add information to this solution:
    I HAVE NOT SEEN ANY REFERENCES TO ENCODER FEED-BACK CAPABILITY IN OF THE HARDWARE YOU SELL. THIS A SUPPORTED FEATURE WITH HARDWARE/SOFTWARE SELL?

  • HOW MUCH RADIATION GIVEN OFF BY A CELL PHONE AND THERE ANY WAY TO STOP THE FROM BEING ABSORBED INTO YOURSELF?

    Portable cell phones emit about 0.6 watts of radiofrequency energy, limited primarily by the power of the battery. As with any radiofrequency transmitter, there will be some amount of absorption in the human body; the amount depends on how close you are to the antenna. The Federal Communications Commission (FCC) limits the amount of radiofrequency energy which cell phones can deposit in the body to levels at which no health effects are to be expected. See an article on Cell Phone Safety on this website for more information.

    Gary H. Zeman, ScD, CHP

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    HOW MUCH RADIATION GIVEN OFF BY A CELL PHONE AND THERE ANY WAY TO STOP THE FROM BEING ABSORBED INTO YOURSELF?

  • LIMIT SWITCHES FOR AXIS. THE PRINT SHOWS THAT YOU CAN WIRE LIMITS EITHER N.O. OR N.C. SO IF THIS IS CORRECT I WOULD NEED TO TELL BOARD IN SOFTWARE HOW LOOK AT THESE LIMITS, I'M GOING GET AN INPUT LOOSE DEPEND ON IT.

    BYCNC Response:
    This is correct. You will need to use a method appropriate for the software you are using. Also remember that NC switches are typically wired in series, while NO switches are normally wired in parallel.

    User Response:
    I am using the cnc planet software for your USB board. Are the limit configurations in this software?

    BYCNC Response:
    Yes, Planet CNC software is compatible with the use of limit switches. Configuration information will depend on your specific application. You can view Planet CNC's information here: http://www.planet-cnc.com/files/CNCUSBController.pdf

    Click the link to add information to this solution:
    LIMIT SWITCHES FOR AXIS. THE PRINT SHOWS THAT YOU CAN WIRE LIMITS EITHER N.O. OR N.C. SO IF THIS IS CORRECT I WOULD NEED TO TELL BOARD IN SOFTWARE HOW LOOK AT THESE LIMITS, I'M GOING GET AN INPUT LOOSE DEPEND ON IT.

  • WAS WONDERING IF YOU COULD TELL ME WHETHER OR NOT SHIP ANY OF YOUR KIT PRODUCTS TO THE UK?

    You can determine if the area is serviceable by:
    - selecting the items you want to purchase on the website
    - go to the cart (shopping cart top left of any webpage)
    - log in, or register
    - Enter the address and click on calculate shipping.

    The webpage will return the direct rates and whether your area is serviced or not. Feel free to enter any address as long as you are able to receive the package from that address.

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    WAS WONDERING IF YOU COULD TELL ME WHETHER OR NOT SHIP ANY OF YOUR KIT PRODUCTS TO THE UK?

  • ARE THERE STILL VIDEOS THAT CAN WATCH AS PUT THIS TOGETHER, I'LL BUY THEM IF HAVE TO, VERY FUSTURATED WITH ELECTROCTICS AND WIRING PART.
  • I HAVE NOT SEEN ANY REFERENCES TO STEPPING MOTOR ENCODER FEED-BACK FOR CLOSED LOOP CAPABILITY IN OF THE HARDWARE YOU SELL. THIS A SUPPORTED FEATURE WITH HARDWARE/SOFTWARE SELL?

    I haven't delved into using encoders with stepping motors too much. From my research, you need to have a controller that can provide the closed loop control, rather than software handling that process. I have also found from my research that using encoders on stepping motors is generally used to stop the machine in the case that the motor failed to achieve the commanded position for some reason and gives the user the chance to correct and continue with the job.

    If you want proper closed loop control, it may be best to go with servos and servo controller that provide the closed loop control within the real of those two components.

    Click the link to add information to this solution:
    I HAVE NOT SEEN ANY REFERENCES TO STEPPING MOTOR ENCODER FEED-BACK FOR CLOSED LOOP CAPABILITY IN OF THE HARDWARE YOU SELL. THIS A SUPPORTED FEATURE WITH HARDWARE/SOFTWARE SELL?

  • CAN YOU PLEASE TELL ME THE AVAILABILITY OF 12X36 BLUE CHICK 4.2, AND COST FOR SHIPPING TO ZIP 72802 IN RUSSELLVILLE, ARKANSAS?

    Yes, the blueChick kits are available. You can get the shipping rates automatically in the shopping cart. There will be a calculate shipping button on the enter shipping information section of the shopping cart.

    Click the link to add information to this solution:
    CAN YOU PLEASE TELL ME THE AVAILABILITY OF 12X36 BLUE CHICK 4.2, AND COST FOR SHIPPING TO ZIP 72802 IN RUSSELLVILLE, ARKANSAS?

  • IT MORE DANGEROUS STAY FOR ONE HOUR AT A TEN-METER DISTANCE FROM CELLULAR ANTENNA OR TALK INTO PHONE THE SAME AMOUNT OF TIME?

    Cellular phones are designed to be safe for both the user and anyone standing nearby. Cellular phones are actually small radios that transmit signals to and from base-station antennas located on towers or buildings in the nearby neighborhood. Cellular phones use low-power radio signals, even weaker than CB, police, or fire radios.

    The American National Standards Institute (ANSI) sets safety standards for human exposure to radiofrequency (RF) electromagnetic energy in the United States. Government agencies such as the Federal Communications Commission (FCC), the Occupational Safety and Health Administration (OSHA), and many states recognize and accept the ANSI RF safety standard. Also, the United States standard for RF energy is comparable to those set in other countries.

    Cellular phones and cellular-phone base stations have been shown to meet these RF safety standards. Safety standards for RF energy are threshold standards. Threshold standards define the level of RF energy above which there may be health or safety hazards and below which there have been no reported harmful effects. Unlike ionizing radiation, which many people believe to act cumulatively even at small exposure levels, RF energy at low levels is not considered a cumulative hazard. Therefore the consensus of scientific experts in this area is that RF exposure from cellular phones, meeting the threshold levels set in safety standards, is safe for all.

    The specific answer to the question is that cellular phone technology is safe for all. There is no danger posed by either handheld phone units or by base-station antennas. In both cases, the radio signals transmitted from the antennas are required to meet the ANSI safety standard for RF safety as embodied in FCC regulations governing this technology. For more information:

    The FCC has recently revised and reissued its Bulletin 56 on Questions and Answers about Biological Effects and Potential Hazards of Radiofrequency Electromagnetic Fields.

    OSHA provides information and links to more sites on RF safety at its Web page, Radiofrequency/Microwave Radiation.

    Gary Zeman, ScD, CHP Lawrence Berkeley National Laboratory

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    IT MORE DANGEROUS STAY FOR ONE HOUR AT A TEN-METER DISTANCE FROM CELLULAR ANTENNA OR TALK INTO PHONE THE SAME AMOUNT OF TIME?

  • WE'VE HEARD THAT ACIP HAS LIMITED THE USE OF ONE INFLUENZA VACCINE PRODUCTS FOR CHILDREN BEGINNING WITH 2010-11 VACCINATION SEASON. TRUE?

    Yes. You are referring to Afluria, which is manufactured in Australia by CSL Laboratories for the U.S. market. CSL's 2010 Southern Hemisphere influenza vaccine (Fluvax and Fluvax Junior) has been associated with increased post-marketing reports of fever and febrile seizures in children predominantly younger than age 5 years as compared to previous years. For this reason, on August 5, 2010, ACIP recommended that Afluria, 0.5 mL, licensed for use in people age 36 months and older, not be used in children younger than age 9 years. ACIP further recommended that Afluria could be administered to children ages 5 through 8 years who are at high risk for influenza complications if there is no other age-appropriate TIV available, after risks and benefits of using this vaccine in this age group have been discussed with the parent or guardian. The vaccine should not be given to children younger than age 5 years. For detailed information, go to www.cdc.gov/media/pressrel/2010/s100806.htm.

    Click the link to add information to this solution:
    WE'VE HEARD THAT ACIP HAS LIMITED THE USE OF ONE INFLUENZA VACCINE PRODUCTS FOR CHILDREN BEGINNING WITH 2010-11 VACCINATION SEASON. TRUE?

  • I HAVE A SIGN SHOP AND WE NEED CUT ALUMINUM, PLEXIGASS, FOAM AND OTHER MATERIALS FOR SIGNS. CAN YOU TELL ME WHAT MACHINE WE NEED? I LOOKING 4'X8' OR 5' X 10'

    The overall size of the machine, really depends on both the area available to you and also the overall size of material being used. Now our larger machines (blackFoot, greenBull, greenLean) can cut all the materials mentioned above, and if equipped with our 2.2kW spindle you will be accurate up to ten thousandths of an inch.
    Our greenBull machine does have an option for a long-z axis, that was especially designed to cut foam, but depending on the overall size it might not be a requirement for the specified request.

    Click the link to add information to this solution:
    I HAVE A SIGN SHOP AND WE NEED CUT ALUMINUM, PLEXIGASS, FOAM AND OTHER MATERIALS FOR SIGNS. CAN YOU TELL ME WHAT MACHINE WE NEED? I LOOKING 4'X8' OR 5' X 10'

  • I AM INTERESTED IN THE 3 AXIS COMBO USB OPTION. NOTICE YOU ENDORSE PLANET-CNC FOR USE WITH THIS BUT WILL MACH3 INTERFACE WELL BEAK OUT BOARD?
  • I HAVE YOUR MACH3 USB BOB, DO YOU GUYS SELL A TORCH CONTROL RELAY CAN WIRE UP TO TURN MY PLASMA ON AND OFF HOW WOULD WIFE THAT TOO THIS BOB?

    We do have a relay board that words like a standard relay.

    Here is the URL of the relay board that we offer:

    https://www.buildyourcnc.com/item/electronicsAndMotors-breakout-Relays-relay-board-250V-12A-5V

    Click the link to add information to this solution:
    I HAVE YOUR MACH3 USB BOB, DO YOU GUYS SELL A TORCH CONTROL RELAY CAN WIRE UP TO TURN MY PLASMA ON AND OFF HOW WOULD WIFE THAT TOO THIS BOB?

  • I WOULD LIKE TO INQUIRE ABOUT THE PHYSICS PRINCIPLES REGARDING USE OF MOBILE PHONES AND DEVELOPMENT BRAIN TUMORS. I'VE BEEN THROUGH MANY SITES BUT THEY CAN NEVER GIVE AN EXACT ANSWER. REALLY SOMEONE TUMORS OR DOES IT HAVE DO WITH INTENSITY RADIATION DISTANCE BETWEEN PHONE INDIVIDUAL?

    It is not clear that mobile phones do produce brain tumors, or any serious health effects for that matter. A number of epidemiology studies have been almost completely negative on the issue.

    See the article I wrote with John Moulder in IEEE Spectrum magazine and also Moulder's FAQ on mobile phones and health.

    There has been a lot of discussion over the years about the possible mechanisms by which microwave energy such as emitted by cell phones might produce biological effects. The one unequivocal mechanism is the heating of tissue, but mobile phones operate at power levels that are too low to cause noticeable heating in the user. Scientists have speculated about other mechanisms, but these theories remain unproven and many of them have been challenged on biophysical grounds.

    Whatever may be the risks or nonrisks of mobile phone radiation, a hands-free kit is an effective way for the user to reduce his or her exposure to radiofrequency energy while using a mobile phone.

    Kenneth R. Foster, Professor
    Department of Bioengineering
    University of Pennsylvania

    Click the link to add information to this solution:
    I WOULD LIKE TO INQUIRE ABOUT THE PHYSICS PRINCIPLES REGARDING USE OF MOBILE PHONES AND DEVELOPMENT BRAIN TUMORS. I'VE BEEN THROUGH MANY SITES BUT THEY CAN NEVER GIVE AN EXACT ANSWER. REALLY SOMEONE TUMORS OR DOES IT HAVE DO WITH INTENSITY RADIATION DISTANCE BETWEEN PHONE INDIVIDUAL?

  • HAVE THERE BEEN ANY STUDIES OF POSSIBLE RADIATION DANGER FROM HEADSETS USED WITH HANDSETS CORDED TELEPHONES? I A TELEPHONE BATTERY-POWERED HANDSET. THIS HANDSET HAS JACK FOR HEADSET, SO YOU CAN WALK AROUND THE HOUSE AND YARD ON YOUR BELT WHILE TALK INTO HEADSET. EITHER OR HEADSET GIVING OFF RADIATION, LIKE CELLULAR PHONE? DANGEROUS AMOUNT RADIATION?

    Headsets have been tested by the manufacturers and meet the current ANSI/IEEE standards for RF safety, the same standards that the Federal Communications Commission enforces under the Telecommunications Act of 1996. These standards place limits on the specific absorption rate (SAR) of radiofrequency (RF) energy in the body. Recent inflamatory articles in British press were not substantiated by testing in ISO-accredited testing facilities at Motorola. Manufacturers of cellular phones are required under FCC regulations to assure that their products meet the SAR limits on both hand-held and hands-free units. Further information may be available from the FDA or from the FCC. Ron Petersen, Lucent C.K. Chou, Motorola

    Click the link to add information to this solution:
    HAVE THERE BEEN ANY STUDIES OF POSSIBLE RADIATION DANGER FROM HEADSETS USED WITH HANDSETS CORDED TELEPHONES? I A TELEPHONE BATTERY-POWERED HANDSET. THIS HANDSET HAS JACK FOR HEADSET, SO YOU CAN WALK AROUND THE HOUSE AND YARD ON YOUR BELT WHILE TALK INTO HEADSET. EITHER OR HEADSET GIVING OFF RADIATION, LIKE CELLULAR PHONE? DANGEROUS AMOUNT RADIATION?

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