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Updated Capture (markdown)

Brumi-2021 2023-08-19 12:46:16 +02:00
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Capture.md

@ -30,6 +30,17 @@ In future versions, it is pending to investigate and try to apply a correct .C16
* % of Dropped Samples (recording error rate, due to SD card write latency, above sample 0%) * % of Dropped Samples (recording error rate, due to SD card write latency, above sample 0%)
* Total Recording Time Remaining (based on available SD card capacity , above example 0h: 13min: 42 secs) * Total Recording Time Remaining (based on available SD card capacity , above example 0h: 13min: 42 secs)
From nightly 23-08-19 onwards, we revised and extended a good functionality of all low bit rate bandwith REC options
If you adjust correctly the GAIN and LNA and center freq. it is possible to capture good bit streams in C16 / C8 format ,
Pls. find attached some examples , capturing the same tuned AM broadcasting , using MF upconverter ,
![image](https://github.com/eried/portapack-mayhem/assets/86470699/3c9c851f-a311-4411-a2a3-09920ce34797)
![image](https://github.com/eried/portapack-mayhem/assets/86470699/d4aa10f5-1155-4924-a35b-c44dd12dc8bc)
Depending on the tuned frequency, (mainly most visible in 25khz, but also less visible in others BW <100k ) we may got a random strange left picture effect -on the screen - with “vertical stripes” , this can be easily corrected, just readjusting the center frequency some Hz up or down , till trying to have full convergence of all red carriers to the central unique one , with +-10Hz steps. (It is pending to check and investigate different decimation filters or channel filters , to solve it and achieve a good performance as we have in the low bit rates 12k5 , 16k )
![image](https://github.com/eried/portapack-mayhem/assets/86470699/89786a12-850c-465b-9fb3-5321d47503dd)
Please check the video below for HackRF PortaPack Capture/Replay functionality. Please check the video below for HackRF PortaPack Capture/Replay functionality.
[![HackRF PortaPack Capture/Replay functionality](http://img.youtube.com/vi/Pe30Jvyhmzk/0.jpg)](http://www.youtube.com/watch?v=Pe30Jvyhmzk "HackRF PortaPack Capture/Replay functionality") [![HackRF PortaPack Capture/Replay functionality](http://img.youtube.com/vi/Pe30Jvyhmzk/0.jpg)](http://www.youtube.com/watch?v=Pe30Jvyhmzk "HackRF PortaPack Capture/Replay functionality")