Hello,
Thanks for the explanations, now I have another silly question :
Why not normalizing the noise floor value to either 1Hz (consistant with
the -174dBm/Hz) or 2,5kHz which in general is the 'normalizing filter
width for noise measurement'.
I would vote for the 1Hz norm , I understand that
Jean Marc:
I think it would be impossible (or at least difficult) to rescale the noise
without also
rescaling the signal levels in the same bandwidth. Even though you can tell
them apart, the
signal processing algorithms can not, so it would introduce errors in the
reported levels of the
Or put another way, if the filter is 10 bins wide (117 Hz = 10*4096/48000)
the noise power in that 117 Hz is the sum of the noise lower in those ten
bins and thus should be ten times or 10 dB bigger than the noise floor.
This is what the meter reads: all the power, noise + signal, in the ten bins
On Wed, Jun 29, 2011 at 5:48 AM, Robert McGwier rwmcgw...@gmail.com wrote:
...Great discussion!
It certainly has been a great discussion, very informative. Thanks to
Jean-Marc for bringing this up, and to Graham and Bob for their
explanations.
Tony KT0NY
Forgive the typo, 117 = 10 * 48000/4096 Hz.
On Wed, Jun 29, 2011 at 6:48 AM, Robert McGwier rwmcgw...@gmail.com wrote:
Or put another way, if the filter is 10 bins wide (117 Hz = 10*4096/48000)
the noise power in that 117 Hz is the sum of the noise lower in those ten
bins and thus should be
Hello,
In Powersdr, how is computed the values of the noise floor across the
spectrum in spectrum, panafall modes ?.
To be more specific, those values relate to which bandwitdh ?.
Kind regards
Jean-marc F1HDI
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On 6/28/2011 9:14 AM, F1HDI wrote:
Hello,
In Powersdr, how is computed the values of the noise floor across the
spectrum in spectrum, panafall modes ?.
To be more specific, those values relate to which bandwitdh ?.
It's not a silly question at all, and I would also like to see the answer.
Hello Jean-Marc:
Not a silly question at all. In fact, a great question.
The panadaptor is fixed at 4096 bins. Each bin is essentially a receiver
with bandwidth
equal to the sample rate divided by 4096.
Example: for a FLEX-1500, which has sample rate of 48,000 samples per
second,
the bin
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