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60 GHz rf meters

Discussion in 'Radio and Wireless' started by ep user, Apr 26, 2020.

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  1. ep user

    ep user

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    Jan 9, 2018
    Anyone know of cheap meters to measure the new 5g signals?
     
  2. Nanren888

    Nanren888

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    Nov 8, 2015
    Cheap?
    Measure? What do you want to measure? How accurately?
    .
    We have a fieldfox. To get to 60GHz a downconverter was recommended. Comparatively cost effective solution. Relatively to buying 60GHz gear. :).
    Then there's an antenna.
    .
    Keystone instruments also have USB, thermocouple-based power probes. Claim good range on them. Obviously need some calibration before use.
    .
    Schottky diode?
     
    bertus likes this.
  3. ep user

    ep user

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    Jan 9, 2018
    Well it's to measure the field strength in homes. Just a rough relative measurement as you walk through the house, to test for unsafe levels.
     
  4. Nanren888

    Nanren888

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    Nov 8, 2015
    If it is from 5G then it's at safe levels. It's in the design of the standards. :)
    Measuring field strengths is not as simple as some imagine. Multiple path makes it complicated. It won't stay the same over time or space. With a wavelength in the order of 5 mm and a reflecting environment, spatial variation over very short distances may be substantial.
    Also 60GHz is chosen specifically because it does not go far, attenutates very rapidly with distance in air. It corresponds to an absorption line so the air itself absorbs it quite quickly.
     
  5. ep user

    ep user

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    Jan 9, 2018
    Well there must be some meters available nevertheless. Kinda like the wifi meters.
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    A 5G phone or other 5G device will likely give you an idea of the signal strength.
     
  7. davenn

    davenn Moderator

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    Sep 5, 2009

    5G IS NOT 60 GHz

    [​IMG]
     
    hevans1944 likes this.
  8. davenn

    davenn Moderator

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    Sep 5, 2009
    [​IMG]
     
    hevans1944 likes this.
  9. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    You and your facts! I bet you think that evidence that 5G doesn't use 60GHz is some sort of evidence that 5G doesn't use 60GHz. Why would you think that?
     
    hevans1944 and Harald Kapp like this.
  10. Harald Kapp

    Harald Kapp Moderator Moderator

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    hevans1944 likes this.
  11. hevans1944

    hevans1944 Hop - AC8NS

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    “Facts, schmacts. You can use facts to prove anything that’s even vaguely true,” Homer Simpson

    Waiting for rebuttal from Sheldon Cooper.
     
    davenn likes this.
  12. bertus

    bertus Moderator

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    Nov 8, 2019
    Hello,

    It won't be cheap:
    https://www.theemcshop.com/rf-field...520-broadband-field-meter-100-khz-60-ghz.html

    About the frequencies for 5G NR, here a piece of the wiki:

    Frequency bands for 5G NR are being separated into two different frequency ranges.
    First there is Frequency Range 1 (FR1)[1] that includes sub-6GHz frequency bands, some of which are bands traditionally used by previous standards, but has been extended to cover potential new spectrum offerings from 410 MHz to 7125 MHz.
    The other is Frequency Range 2 (FR2)[2] that includes frequency bands from 24.25 GHz to 52.6 GHz. Bands in this millimeter wave range have shorter range but higher available bandwidth than bands in the FR1.[3]

    https://en.wikipedia.org/wiki/5G_NR_frequency_bands

    Bertus
     
    hevans1944 likes this.
  13. skenn_ie

    skenn_ie

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    Sep 7, 2009
    What are considered "safe" levels, and based on what ? We really don't know what the short-term effects of RF of any frequency are, never mind the long term effects. Life has had millions of years to "evaluate" naturally occurring EMR. We have had less than 100 years to evaluate man-made EMR.
     
  14. ep user

    ep user

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    Jan 9, 2018
    Looks like the Narda meter might suffice. Anyone has asked for a quote?
    Just using the meter on a phone though, would not show over-strength levels.
     
  15. ep user

    ep user

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    Jan 9, 2018
    Yes those would be a start, at least for low-signal areas. But for over-strength areas near the antennas, I think a separate dedicated meter is needed.
     
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