I'm having a difficult time trying to solve something that should be very easy.
I have the following:
40dBm  6 dB + 10dB  Lprop > 100dBm
Now, the answer should be Lprop < 144dB, but I'm getting messed up with the signs.
I'm trying to move the 100dBm to the left part of the inequation and I think there is where I'm doing it wrong. If I move it to the other part with a + signus, then I'm adding dBm with dBm and, that doesn't make sense, as they would be mW^2 and Lprop is unitless.
What should happen somehow is that I would need to substract dBm  dBm in order to get dB, but I can't figure this out.
Could someone make the solution of this step by step and providing as much information as posible? That would be of great help thank you!
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2 answers

40dBm  6 dB + 10dB  Lprop > 100dBm
are you solving for Lprop?
Lprop > 100dBm  40dBm + 6dB  10dB
Lprop > 144 dBm  4dB
Lprop < 144dBm + 4dB 👍
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answered by Reiny 
40dBm  6 dB + 10dB  Lprop > 100dBm
Your dBm's will never cancel out... regardless of what side you bring them too.
Do you have to convert your dB's to dBm's first??
hmmm.... 👍
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answered by MsPi_3.14159265
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