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studentkra
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Although the SPI bus specification does not involve the use of blocking capacitors to ground, I think it's worth a try. Capacitors need to be installed on both sides. Near the GPIO connector and near the FPGA. The capacity should be tens of picofara…
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HB9TMC, yes, you're right. There was interference from KiwiSDR on the nearby antennas of other receivers that work on VHF. And it's definitely not from the power cable. As I already wrote, connecting the SMA connectors to the aluminum housing reduce…
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Glenn, I didn't understand what you wrote at all ))) But I think it's fascinating. Perhaps I should study high-frequency currents in more detail. Thanks!
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I don't understand high-frequency currents at all and how they propagate. I had the lowest grade in this subject at the institute. But by an experimental method, I found out that SMA connectors that do not have physical contact with the aluminum hou…
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Hi, jks. I don't have admin access to my KiwiSDR yet (I rented it). Later I will ask the host to grant me full access. As for the SPI and PWM noises, they have different shapes and are easily distinguishable on the waterfall. SPI noises have a prono…
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I almost got rid of the internal noise of the Kiwi SDR on VHF by connecting the SMA connector housings to the aluminum housing. And you want to isolate them from the masses! I think it's a bad idea. However, my setup is specific. All the antennas ar…
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jks, thank you for your work! Adding a controlled attenuator gives a lot of interesting things! Schedule management is brilliant! And of course the admin has to decide whether the user can control the attenuator.
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Are you saying that the attenuator will be controlled by the user?!!
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Here is a screenshot. It's 13:40 local time. https://forum.kiwisdr.com/uploads/339/5SY2BGOXAGB5.jpg
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Martin, it would be very interesting to know your opinion about my KiwiSDR. However, it is only available for my country's IP addresses. https://forum.kiwisdr.com/uploads/295/3JBN8NIQ8B8K.jpg https://forum.kiwisdr.com/uploads/379/W2IOY2MADTKE.jpg
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Hello, @jks! Many use an active antenna powered by a coaxial cable. I use a single 5 and 12 volt power supply with a common ground for this. In this case, it turns out that the SMA housing of the KiwiSDR connector will be connected to the housing of…
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Hello everyone! Maybe someone will be interested in this. Can dear @jks add this to the new release)) I wrote a small script for KiwiSDR. The script collects SNR rating data from the site http://rx.linkfanel.net/snr.html and draws rating charts for…
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I was glad to help!
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Maybe the FireFox console has some additional security settings that don't allow functions to run or something like that? Try to type just: export_waterfall(); And it seems to me that you have some other console)) Press F12 and chose "Console&q…
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I check in Firefox. It works ))) https://forum.kiwisdr.com/uploads/606/USABQ5RAG5AK.jpg
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Martin, I tested it on the original KiwiSDR and on the non-original. Everything works and I don't get any errors. I realized your mistake. Use the browser console (F12 or ctrl+shif+j) and not the ssh console.
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There is a function export_waterfall(). It records the waterfall in a jpg file. This function can be called periodically after a certain time. This way the waterfall will be saved automatically. For example setInterval(export_waterfall, 60000); will…
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Thanks, John. We always ready to give you new ideas. And I really hope that you will be able to implement them.
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As I understand it, sig-gen is an FPGA software tool. What if we try to use a free GPIO and generate a hardware PWM signal to test the ADC?
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Just add grim reaper to the black list and stop thinking about this!!!
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I will add a little to the theme of camping. Let's assume that KiwiSDR has masked frequencies with password access in the address bar. And there is an authorized user who is currently listening to this frequency. Then by connecting via the camping, …
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In addition to KiwiSDR, I have several other receivers with remote access. And these receivers work on VHF. The installation of this end plate with a physical SMA contact on the shield completely freed the VHF receivers from interference. And by the…
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Martin, thanks! Very interesting article!
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Hi. I found that KiwiSDR in such metal case emits interference at frequencies above 65 MHz. The culprit of the interference is the LMR10530Y pulse converter. But the main problem is that the SMA connector thread does not have physical contact with t…
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I also couldn't understand the properties of this "object" for a long time until I placed it inside <div></div>. After that, it is subject to any transformation.
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Its very easy! https://forum.kiwisdr.com/uploads/640/N2112QQPBE0P.jpg
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Try to change sizes of div, not object: <div style="width:800px; height:20px;position:relative;top:-15px"><object data="http://jimlill.com/sun.txt"></object></div>
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Martin, this is exactly what I was looking for. Thank you for experimenting with the power supply! In most of the ready-made modules, a 100kOhm resistor is installed on the MP1584, which sets the frequency of PWM operation. You can reduce its resist…
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After starting a new receiver on short waves, I received interference from a switching power supply. Partially they were reduced by a power filter in front of the 220 volt outlet. I'm thinking of using a 12 volt transformer power supply and a 5 volt…
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https://forum.kiwisdr.com/uploads/107/9LA8HY6EHOC6.jpg https://forum.kiwisdr.com/uploads/393/Q1BV99W3V5CR.jpg I have been using a small python script for one year. It analyzes log and writes all connections to a special file. A small adaptation is …