Hello Max

The osmocom_fft app is the first thing I ran upon install. It does in fact display the desired spectrum as expected. However, in order for the app to display the ppm slider, you must specify a ppm value from the command line parameter. e.g. -c 61

Here is an example for any new comer that comes along; (This will show the relevant tweek settings at run time.)
osmocom_fft -a rtl=0 -v -f 853.275e6 -s 2.4e6 -g 49 -c 61 --dc-offset-mode 0 --iq-balance-mode 0 -W

The last parameter -W is for the waterfall. Use -S for the oscilloscope view.

As far as your scope script, I invoke it like this: ./scope.py --args "rtl=0" -f 851.012e6

Here is the intial responce

linux; GNU C++ version 4.6.3; Boost_105300; UHD_003.006.002-64-g92b0b7ab

gr-osmosdr v0.1.0-59-g7ae3e985 (0.1.1git) gnuradio v3.7.2.1-137-gf7f28bbd
built-in source types: file osmosdr fcd rtl rtl_tcp uhd hackrf bladerf rfspace
Using device #0 Realtek RTL2838UHIDIR SN: 00000061
Found Rafael Micro R820T tuner
gain: name: LNA range: start 0 stop 0 step 0
supported sample rates 250000-2560000 step 24000
Using Volk machine: sse3_32_orc
Invalid sample rate: 320000 Hz
set_center_freq: 851012000

I've never gotten the script to except a valid sample rate either. I'm assuming it's passing an invalid format to the osmosdr subsystem? I also don't think it's setting the frequency correcly, though it's not complaining. All plots look the same no matter what frequency I enter.

I'm not sure how to proceed, so I'll wait for your instructions..

Thanks Max

-Scott

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