- #1

- 14

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The values range from 112 to -36dB. How can I properly interpret the attenuation loss in each case in this table? In other words, for a reference of 1 volt/meter and no signal loss, what is the expect value in dB?

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- Thread starter Ionito
- Start date

- #1

- 14

- 0

The values range from 112 to -36dB. How can I properly interpret the attenuation loss in each case in this table? In other words, for a reference of 1 volt/meter and no signal loss, what is the expect value in dB?

- #2

- 4,662

- 6

dB = 20Log(V2/V1), or

V2/V1 = 10^

A change of a factor of two is

20Log(2) = 6.02 dB

Bob S

- #3

- 1,763

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- #4

- 14

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Hi skeptic2, completely sure about 1V/m, that is why I did not understand.

- #5

sophiecentaur

Science Advisor

Gold Member

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If it is simply tabulating a mathematical relationship there need be no problem. If it it supposed to relate to some physical situation then it seems to have some rather high values: nearly 0.5 MV/m! Hardly a "signal" strength!

- #6

- 14

- 0

Therefore, the values I am seeing in the table correspond conversions of this reference. If the signal is not attenuated, I have 1V=1*10

- #7

sophiecentaur

Science Advisor

Gold Member

- 27,200

- 5,907

1V/m is 0dBV/m

or

1V/m is 120dBmuV/m

That's an identity, surely.

That assumes the same impedance. dB is actually a log of power ratio.

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