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From: | Vitt Benv |
Subject: | Fwd: Frequency Xlating Fir Filter issue passing message |
Date: | Sat, 21 Mar 2020 16:13:33 +0100 |
On 03/20/2020 05:10 PM, Vitt Benv wrote:
Quick look suggests that you're confused about how the freq-xlating-filter works. The center frequency is the *baseband* frequency, notGood evening,I'm trying to make a multimode receiver using a PlutoSDR; all the demodulation and visualization parts work correctly. Now I would like to use a click'n-point tuning and as a result I have tried to understand something more about the use of controlports. I followed some tutorials and made a custom block (myblock.py "Message splitter") which receives the message generated by double clicking on the waterfallas an input and generates a message to be sent to the Frequency Xlating Fir Filter block, which consists of an offset between the center frequency (fx) and the frequency generated by the double click. I state that by controlling this block with a slider (fx_tune) everything works correctly, but using the outgoing message the set frequency is completely incorrect. In the embedeed block I perform an output of the variables involved directly on the console and everything "apparently" is correct. Any ideas / suggestions? Attached is the .grc file, the source of the "Message splitter" block and a printscreen of the blocks (I have eliminated what is unnecessary and already functional). Thanks in advance, Vittorio, I3VFJ
the RF frequency that your hardware is tuned to. Gnu Radio, internally, deals with basebanded signals, typically, and the RF frequencies
are purely hardware-on-the-outside thing.
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