I recorded a file this morning to a RAMDisk, about 15 seconds worth of
data. I copied the file off of the RAMDisk to my Linux Desktop to save it
when I reboot. However, when I play the file back off the Desktop, the
playback continues endlessly. When I play back off the RAMDisk, it is only
the ~15
On Wed, Dec 4, 2013 at 6:39 AM, Paul B. Huter wrote:
> There must be something with my record, because my 20 seconds of running
> only produces about a 180MB file. I am not seeing any indications of dropped
> data, though. I am recording to a RAMDisk, but I get the same results
> recording to my H
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How do you downsample 50 to 30 Msps? With a fractional resampler?
That's highly demanding of your CPU! Do it with the recorded data, not
before, if you can afford the memory.
On 04.12.2013 13:47, Paul B. Huter wrote:
> Without the low pass filter, I w
Without the low pass filter, I was getting a sequence of D's. The low pass
filter uses a Volk machine, and downsamples the 50M to 30M with a 5M
transition size. I am using the GUI companion on Linux, but I vaguely
recall that I may have had better luck recording when I just created a
Python script
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With most hardware interfaces, you get notifications when your
driver/interface starts dropping samples -- with UHD you'd see loads
of 'O' indicating overflows.
If you don't see that, there is something really wrong. How does your
data acquisition take
There must be something with my record, because my 20 seconds of running
only produces about a 180MB file. I am not seeing any indications of
dropped data, though. I am recording to a RAMDisk, but I get the same
results recording to my HDD.
Does anyone have recommendations for how to ensure I get
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Hi Paul!
I'm gonna go ahead and rearrange parts of your message for the ease of
reply:
> My datafile was recorded for about 20 seconds at a sample rate of
> 50Msps through a low-pass filter to only capture 0-30MHz.
50Msps * 20s = 1Gs (you're sure you
Marcus:
I like the way the waterfall looks, but I'm having the same issue as the
FFT.
Looking at the configuration for my FFT, and changing 'Refresh Rate' from
the default '15' to '1M' gives me some extra playback. My datafile was
recorded for about 20 seconds at a sample rate of 50Msps through a
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Most probably your data is simply to short in relation to the fft
length and the amount of samples your specific graphical FFT amplitude
sink drops for display.
Please review you fft length, update rate, and try out different fft
GUIs (qt/wx).
You cou
When I play my data file back through a throttle and frequency translating
FIR filter to an FFT sink with repeat OFF, it seems to just show a static
plot. However, with repeat ON, I get playback, but I can't tell when data
ends and starts back over. Is there a way for me to know when it repeats?
Or
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