Well, thank you for creating the documentation! I really look forward to learning as much as I can comprehend, and pushing my limitations of understanding. Thanks for you and the teams' hard work.
Interesting point on Question-01. Yes, you are correct… 200 kHz bandwidth. I guess I was considering the guard bands (25 kHz upper and lower). Thank you for clarifying. I verified here:
http://hyperphysics.phy-astr.gsu.edu/hbase/Audio/radio.html
I wondered why you used 192k for the FunCube.
Follow up question:
· How can I know the max sample rate for each device?
o Assumingly, reading the Spec Sheets? (Until I’m clever enough to build my own!)
For Question-02, I was referring to: https://wiki.gnuradio.org/index.php/Guided_Tutorial_Hardware_Considerations, apologies for not being explicit.
Here, the author used a multiplier of 1.05
I.e., for the Rational Resampler Block used:
· Interpolation: int(1.05 * (audio_rate * audio_interp))
· Decimation: int(samp_rate)
I mapped that value of 1.05 to a slider and adjusted it during playback. It made no difference. I assumed this is because it did not have enough weight to push the sample rate in or out of range. After doing the actual math, I see the multiplier I used will never bring the value to the sample rate I needed for my particular device.
To verify, I created a follow up slider where I adjust the sample rate value. It shows me pretty clearly where the limit lies. Below is the new flow graph.
For the reference to your name, I was following the Sample Rate Tutorial you wrote. I must of assumed you also did the follow up lesson stated above. Your name was attached to:
https://wiki.gnuradio.org/index.php/Sample_Rate_Tutorial
Sorry for the confusion, but thank you for the help!
Many thanks,
