From: Marcus MüllerSent: Monday, June 26, 2017 9:18 AMTo: discuss-gnuradio@gnu.orgSubject: Re: [Discuss-gnuradio] dB or dBm
Hi!
I f
id, dk5ras
> *Sent: *Sunday, June 25, 2017 11:44 PM
> *To: *'Murat Aksu'; Discuss-gnuradio@gnu.org
> *Subject: *Re: [Discuss-gnuradio] dB or dBm
>
>
> Well, dBm is an absolute power, based on 0dBm = 1mW. The dB figures of
> your receiver are only relative values, they
: Ralph A. Schmid, dk5rasSent: Sunday, June 25, 2017 11:44 PMTo: 'Murat Aksu'; Discuss-gnuradio@gnu.orgSubject: Re: [Discuss-gnuradio] dB or dBmWell, dBm is an absolute power, based on 0dBm = 1mW. The dB figures of your receiver are only relative values, they have no meaning
[mailto:muratc...@hotmail.com]
Sent: Thursday, June 22, 2017 4:58 PM
To: Ralph A. Schmid, dk5ras
Subject: Re: [Discuss-gnuradio] dB or dBm
Dear Ralph,
Thank you so much for your support. I really do not understand these dB
values. When I inject 802.11g signal with -20 dBm power level and 20 dB
017 10:48 PM
> To: Discuss-gnuradio@gnu.org
> Subject: Re: [Discuss-gnuradio] dB or dBm
>
> I am already aware of what the maximum allowable receiver power which is
-5
> dBm. That is why I am starting from 0 dBm with 20 dB attenuator before
> injecting it to the HackRF One.
>
>
&g
I am already aware of what the maximum allowable receiver power which is -5
dBm. That is why I am starting from 0 dBm with 20 dB attenuator before
injecting it to the HackRF One.
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From: GNUBeginner
Sent: Wednesday, June 21, 2017 11:57 AM
To: Discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] dB or dBm
How could I generate this simple sinusoidal signal with fixed frequency and
amplitude using Anritsu MG3710A?
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How could I generate this simple sinusoidal signal with fixed frequency and
amplitude using Anritsu MG3710A?
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Sent from the GnuRadio mailing list archive at Nabble.com.
Yes - he meant a constant tone, a simple sinusoidal signal with fixed
frequency and amplitude (Acos(wt)).
And you can't measure the power directly. What you can measure is the graph
(function) between the injected power (as determined in your signal source)
to those strange dB values. After you
-20 dBm is a pretty strong signal. You're probably over driving your SDR
into compression. I would use a larger value attenuator or reduce the
levels from the signal generator.
Ron
On 06/21/2017 08:55 AM, GNUBeginner wrote:
Thank you for your detailed message. Please correct me if I am on
Also, how could I measure power? The program is giving some strange dB
values...
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___
When you say constant tone, you mean some sinusoidal signal with fixed
frequency using Anritsu vector signal generator? Any suggestions generating
this signal with VSG?
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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
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
Marcus explained it better than me in your previous email, but in general,
those SDR devices aren't calibrated devices, as in you (the user) can't
infer from the sample value the signal power, so the apps (e.g.,
QSpectrumAnalyzer) can't tell you anything about dBm (power) values, only
dB values
Hello Everybody,
Could anyone please try to explain to me why I am seeing dB values instead
of dBm in the spectrum analyzer GUIs such as QSpectrumAnalyzer or spectrum
scan programs such as gr-scan or hackrf_sweep.
Because when I inject a signal with -15 dBm power using 20 dB attenuator (no
loss
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