James,
Thank you for your comments on our documentation! I started working on
the docs last year including adding flowgraphs to the block docs and
updating the tutorials to rel 3.8. The
https://wiki.gnuradio.org/index.php/Guided_Tutorial_Hardware_Considerations
is one which has been updated recently, but I didn't have the hardware
to test it. (I will next week).
So, for question 1: that tutorial was written several years ago. I don't
know why that sample rate was chosen, but some older computers have
trouble with high sample rates. Actually the broadcast FM signal in the
US is 200kHz with all the SCA, etc. but the minimum for stereo is less.
If you look at the flowgraph for
https://wiki.gnuradio.org/index.php/WBFM_Receive I use 192kHz because
that is the rate for a FunCube Pro+.
For question 2: In the tutorial
https://wiki.gnuradio.org/index.php/Guided_Tutorial_Hardware_Considerations#A_Working_Software_Radio_Broadcast_FM_Receiver
there is no multiplier, so I am guessing that you are looking at
https://wiki.gnuradio.org/index.php/WBFM_Receive where the multiply
block is the volume control.
You said "In your (Barry Duggan's) example the multiplier helped to
remove his static". Can you tell me which of my examples you are
referring to?
Best regards,
--
Barry Duggan KV4FV
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