Understanding dB Math

[@KK-rg3nj]

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!

[@isolinear9836]

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.

[@mahendrachavan1831]

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

[@wongalex9457]

Thank you, I struggle for so long of this

[@victornjoroge562]

Magical! Great video..Thanks Keith for sharing this

[@billaday]

Agree!

[@pauloche9346]

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

[@akshaychavan9308]

Great video...now its far more clear

[@WirelessLANProfessionals]

Thanks again Akshay

[@kasiviswanathan9505]

Best video .. perfect .. thanks

[@WirelessLANProfessionals]

Thanks Kasi!

[@billaday]

@@WirelessLANProfessionals for you also!

[@qzorn4440]

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

[@WirelessLANProfessionals]

Glad it helped. Thank you for watching!

[@Kof_Believer]

I just subscribed. Thanks

[@joelourenco4621]

Thank you so much!! I appreciate this.

[@jspaceboy1117]

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]

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. 🙂

[@deedoi]

Thank you so much!

[@theofanisc.karagiorgos9520]

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?

[@MrVineetkumargupta]

Great method to calculate dbM to mw

[@WirelessLANProfessionals]

Glad it was helpful! Thanks for watching!

[@onlyonetony]

YES!

[@Dylan-ni1tc]

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.

[@dinyarbuhariwalla1120]

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]

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

[@piotrstukin9274]

Why there is a 1* in the formula?

[@phillipkluttz6553]

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

[@WirelessLANProfessionals]

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

[@WirelessLANProfessionals]

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]

@@WirelessLANProfessionals Thank you! The page loads now.

[@MrGeronimo]

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

[@k9handler95]

D: Dragon B: Ball Math

[@c.danielpremkumar8495]

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