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Send IQ issue with external 433 MHz ask transmitter #299

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Mifaxav opened this issue Apr 30, 2023 · 4 comments
Open

Send IQ issue with external 433 MHz ask transmitter #299

Mifaxav opened this issue Apr 30, 2023 · 4 comments

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@Mifaxav
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Mifaxav commented Apr 30, 2023

I wanted to transmit at 433 MHz but using an external transmitter module with the pi. I tries loads of other software to try not to use the pi's own way of transmitting. I came back to rpitx and used an external transmitter connected to GPIO 4. The issue I am currently facing is that with older iq files that I made before I even got this transmitter is being transmitted on the desired frequency THROUGH the 433 MHz transmitter itself. I recorded another IQ file but this time when I go to transmit it, the transmission from the external module stops while the pi transmits its own stuff and restarts again after the transmission has ended. Can this issue somehow be fixed in another repo or are there any alternatives I can use to run IQ files through an external ASK module? Ive had half success until now

@Mifaxav
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Mifaxav commented Apr 30, 2023

So it seems for some reason the files that are saved by the rtl_sdr iq command are not type u8 files which might be causing the error. Any idea on a fix?

@Mifaxav
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Mifaxav commented Apr 30, 2023

so I sudo cat both files (working and non working) and they are totally different (layout wise first glance)

@Mifaxav
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Mifaxav commented Apr 30, 2023

its like in both iq files im able to see the intervals in which the signal was caught but in the working file it had loads of question marks with the intervals being random digits whereas in the non working file its just gibberish everywhere but im still able to make out the signal intervals

@Mifaxav
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Mifaxav commented Apr 30, 2023

also, transponder mode in rtlmenu works where the signal is being received by sir and live transcoded through the external module

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