Архив за 25.09.2019

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Removing EMI from PoE on Raspberry Pi

I've been building a RaspberryPi-based NOAA/Meteor setup that I eventually plan to move up to the roof. I would like to use use power-over-ethernet to reduce the length of coax running between the antenna and RTLSDR dongle.

I first tested the setup using traditional wall power to the micro-usb port on the RPi and was pretty happy with reception (example). Once I put everything in a single enclosure and cut over to PoE the image quality tanked (worst example).

My current setup is like this: QFH -> 137 Mhz bandpass filter -> NOAA sawbird (contains LNAs and filters) -> FM Trap -> RTLSDR + Bias tee.

Images got a little better (imgur) once I installed the PoE splitter in an Altoids case (imgur) and physically separated components, and then a little more better (imgur) once I put on the FM trap.

What are some strategies for diagnosing and removing EMI noise? Is PoE a fundamentally bad idea for me?

submitted by /u/gdusbabek
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Walking soda and hotdog in my spectrum? bad wifi signal

Walking soda and hotdog in my spectrum? bad wifi signal submitted by /u/sdrmatlab
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WIP Inmarsat antenna. If you have experience with patch antenna design, please read my comment, I need your help

WIP Inmarsat antenna. If you have experience with patch antenna design, please read my comment, I need your help submitted by /u/derekcz
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GOES 16 from the UK?

GOES 16 from the UK?

I know this sounds stupid but would it be possible to pick up GOES 16 from the UK, I live right at the edge before the earths curvature in the way of the signal.

I imagine that the signal would be too weak to do anything with (if I can even get one), but would still be willing to try.

https://i.redd.it/h1i11i6mkso31.png

submitted by /u/Xerbot
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KerberosSDR • Compass

Perhaps I have overlooked the answer to this - but does someone have a code patch that will correct the Web_compass results.... I believe that patch would belong in hydra_main_window.py file that writes the value to html_str file. A little more specific - I believe the correction is within this area of code. Any help would be appreciated.

From hydra_main_window.py :

CODE:

DOA_results = np.array(DOA_results)            # Convert measured DOAs to complex numbers            DOA_results_c = np.exp(1j*np.deg2rad(DOA_results))            # Average measured DOA angles            DOA_avg_c = np.average(DOA_results_c)            # Convert back to degree            DOA = np.rad2deg(np.angle(DOA_avg_c))            # Update DOA results on the compass display            #print("[ INFO ] Python GUI: DOA results :",DOA_results)                         if DOA < 0:                DOA += 360            #DOA = 360 - DOA            DOA_str = str(int(DOA))             html_str = "<DOA>"+DOA_str+"</DOA><CONF>"+str(int(confidence_sum))+"</CONF><PWR>"+str(np.maximum(0, max_power_level))+"</PWR>"            self.DOA_res_fd.seek(0)            self.DOA_res_fd.write(html_str)            self.DOA_res_fd.truncate()            #print("[ INFO ] Python GUI: DOA results writen:",html_str)                                            

Statistics: Posted by myke — Wed Sep 25, 2019 10:24 pm


Troubleshooting Help • SDR Sharp

I am not all that good with software . So I have two questions about the SDRSharp software . The first is how do you turn on the app's that are in the software package ??? Example ADBSspy app. the airspy Calibrate app. and others ?????????? Now the other question that I have is about the Community Package with Plugins in it ???? Is it the same software as SDRSHARP , but it has more app's in it ????????

Statistics: Posted by P-40 Warhawk — Wed Sep 25, 2019 9:55 pm


Если он его не признаёт, кто будет править? )) Если начнутся массовые жалобы (а они начнутся думаю) , то поправят …

TarLink пишет:
Если он его не признаёт, кто будет править? )) Если начнутся массовые жалобы (а они начнутся думаю) , то поправят ...
читать полностью...
Широкополосный приёмник из DVB донгла - Страница #576

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Выход пока только один — не забывать перед выходом снижать усиление за данную границу… Забудешь — ничего страшного , в…

TarLink пишет:
Выход пока только один - не забывать перед выходом снижать усиление за данную границу... Забудешь - ничего страшного , выше писал как поправить конфиг и снова все заработает , а так да , обидно что н...
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Широкополосный приёмник из DVB донгла - Страница #576

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TarLink Если он его не признаёт, кто будет править? )) Выход пока только один — не забывать перед выходом снижать усилен…

RANET пишет:
TarLink Если он его не признаёт, кто будет править? )) Выход пока только один - не забывать перед выходом снижать усиление за данную границу...
читать полностью...
Широкополосный приёмник из DVB донгла - Страница #576

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