Understanding dB Math

Поделиться
HTML-код
  • Опубликовано: 4 дек 2024

Комментарии • 34

  • @KK-rg3nj
    @KK-rg3nj 7 месяцев назад +1

    Thanks for this video! Pretty systematic way of doing this mentally. We can also modify this to the voltage log/dB expression of YdB = 20log(x) by changing the values in the dB column to 2x ie, 20 dB => 10 and 6dB => 2.
    So for example:
    60dB would become: 20+20+20 = 10^3 = 1000 times
    And 26dB would be: 20+6 = 10*2 = 20 times
    Appreciate your effort to simplify this!

  • @wongalex9457
    @wongalex9457 2 года назад +1

    Thank you, I struggle for so long of this

  • @isolinear9836
    @isolinear9836 Год назад +1

    Thanks a lot Sir. This will be really useful as a template for me to teach other people. A shame nobody taught me this method decades ago. I've been doing it the "way you're supposed to" mentally (with my personal shortcuts developed over the decades, so there's no point in me using your methodical shortcuts now), but it would have been easier on me if I'd been taught this from the beginning. I remember struggling to do the math in my head when I was a kid. Ah well, at least I get to use this method in teaching others which seems a LOT easier to articulate and demonstrate.

  • @akshaychavan9308
    @akshaychavan9308 4 года назад +3

    Great video...now its far more clear

  • @victornjoroge562
    @victornjoroge562 4 года назад +4

    Magical! Great video..Thanks Keith for sharing this

  • @kasiviswanathan9505
    @kasiviswanathan9505 4 года назад +4

    Best video .. perfect .. thanks

  • @Kof_Believer
    @Kof_Believer 7 месяцев назад +1

    I just subscribed. Thanks

  • @mahendrachavan1831
    @mahendrachavan1831 Год назад

    No idea why it took so long to get this video, Sir...Thank you a Billon Tons!!!! 😀

  • @joelourenco4621
    @joelourenco4621 4 года назад +2

    Thank you so much!! I appreciate this.

  • @qzorn4440
    @qzorn4440 3 года назад +1

    very nice for an esp32 arduino wifi project... now to remember this great info 6 months from now and longer... 👍👍 thanks a lot...😉

  • @deedoi
    @deedoi Год назад

    Thank you so much!

  • @pauloche9346
    @pauloche9346 5 месяцев назад +1

    'You are such a great cheat'. 🤣. Anyways, thanks for the trick. Works like magic.

  • @onlyonetony
    @onlyonetony Год назад +1

    YES!

  • @MrVineetkumargupta
    @MrVineetkumargupta 3 года назад

    Great method to calculate dbM to mw

  • @jspaceboy1117
    @jspaceboy1117 3 года назад +2

    How would you go from normal to db? For example 500 Watts? I think I figured it out but want to make sure (10*10*5 --> 10+10+7 = 27)

    • @WirelessLANProfessionals
      @WirelessLANProfessionals  3 года назад +4

      Thanks for your insight! We'll just have to reverse the conversion. In this case, 500 mW would be: [(10x10x10)/2] ---> [(10+10+10)-3 = 27]
      Remember that there are only 3s and 2s, no 5s. 🙂

  • @theofanisc.karagiorgos9520
    @theofanisc.karagiorgos9520 Год назад

    what about dBm =-110 i.e? should add the "-" after the calculation? or start with 1/10*10*10*10*10*10*10*10*10*10*10?

  • @Dylan-ni1tc
    @Dylan-ni1tc Год назад

    Hello, I have a question.
    I learned an equation which simplifies converting dB to dBm (by using this following eq, dBm = dB + 30) at college in my freshmen year. But now, fast forward almost 4 years later, I found that this method is highly debateable amongst telecom engineer. And right now, i'm in a desperate situation about this converting dBs stuff. I need to finish an eq which involves dBm and dB. My eq problem is Rx (dBm) = Tx (dBm) - Pathloss (dB), I have the data for Rx and Tx in dBm, but I need to know whats maximum distance in the PL equation (Cost231-Hata model). Is it allowed to use this methods? If not, how can I find the maximum distance? Thank you.

  • @piotrstukin9274
    @piotrstukin9274 Год назад

    Why there is a 1* in the formula?

  • @dinyarbuhariwalla1120
    @dinyarbuhariwalla1120 2 года назад

    Hello Sir, how will you convert a decimal mw to dbm? for eg if i want to convert from 25 milli watt to dbm?

    • @holmiumh
      @holmiumh Год назад

      Well, you can always use a calculator, but if you want to do an approximation without tool then here's one way to do it, let's say you want to convert 25 mW to dBm?
      1, You know by heart that 20dBm = 100mW (if you don't know why, review definition of dBm and dB)
      2, You know by heart that -6 dB = -3 -3 dB ≈ 0.5 x 0.5 = 0.25 (if you don't know why, review the approximated usage of ±3dB)
      3, 25mW = 100mW x 0.25 ≈ (20 - 6) dBm = 14dBm

  • @MrGeronimo
    @MrGeronimo 2 года назад

    Prof. -48dbm is it good or not good for 100Mbps internet fiber optique 😂 or shouldn’t be like that 🙃

  • @phillipkluttz6553
    @phillipkluttz6553 4 года назад +1

    Keith, The link to the resources returns "No results found".

    • @WirelessLANProfessionals
      @WirelessLANProfessionals  4 года назад

      Phillip, my apologies - let me see what if I can get that fixed.

    • @WirelessLANProfessionals
      @WirelessLANProfessionals  4 года назад

      Phillip, the resources links were there - at the bottom of the page - I reorganized the page so the resources are easily and accessible up top. Sorry for the confusion there :) Let us know I you have any other issues.

    • @phillipkluttz6553
      @phillipkluttz6553 4 года назад

      @@WirelessLANProfessionals Thank you! The page loads now.

  • @k9handler95
    @k9handler95 Год назад

    D: Dragon
    B: Ball
    Math

  • @c.danielpremkumar8495
    @c.danielpremkumar8495 Месяц назад

    5.56 couldn't understand any thing in this cheat sheet. Perhaps a different explanation will help.