Re: [Discuss-gnuradio] dB or dBm

[Julian Arnold]

Hey,

as has been said previously, it depends on the type of signal you are
observing how you would need to characterize and measure its power.
For example, your signal will change over time depending on your payload
data which you need to consider. You would also need to consider the
bandwidth of the signal as it is not just made up of one peak in the
frequency domain.

I would try something simpler at the beginning. Generate a constant tone
at a fixed frequency and try to measure its power first.
Than, you can think about more complex signals.

Cheers,

On 06/21/2017 05:55 PM, GNUBeginner wrote:
> Thank you for your detailed message. Please correct me if I am on the wrong
> path.
>
> I am injecting 802.11g signal using Vector Signal Generator at different
> power levels (0 dBm, -5 dBm, -10 dBm, -15 dBm and -20 dBm) using 20 dB
> attenuator. After running gr-scan with RF gain 0 dB option at the first
> center frequency for this OFDM signal which is 2412 MHz, I am seeing the
> following dB results respectively:
>
> -49.37 dB
> -49.54 dB
> -50.23 dB
> -53.58 dB
> -58.52 dB
>
> I am also planning to continue the same experiment using the other two
> center frequency options which are 2437 MHz and 2462 MHz.
>
> I would appreciate if you could please tell me what I am doing wrong. I am
> using modified gr-scan code which has the RF Gain option included by zelfie.
>
> Thanks
>
>
>
> --
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>
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-- 
Julian Arnold, M.Sc.

Institute for Networked Systems
RWTH Aachen University

Kackertstrasse 9
52072 Aachen
Germany