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verymetl at hotmail.com verymetl at hotmail.comHello 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/op25-dev/attachments/20140118/91b3f7ae/attachment.htm>