studentkra
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Thank you very much! I think many KiwiSDR users of the first version will want to use an external attenuator. The simplest option is to connect via USB (virtual COM port). It would be great if John added such a feature to the KiwiSDR 2 software. Jus…
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Thanks! If I run this command 10 times a second, nothing will break? There will be a constant reading of one file, which may affect reliability.
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I got the PE4302 attenuator board. I also have a STM32 blue pill board for management. I have configured everything and now the attenuator is controlled via STM32, which will be connected to KiwiSDR only via USB connector. A virtual COM port is crea…
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Look, as an example, at such a variant of the statistics of data about your KiwiSDR. http://std.swl.su:8073/config/snr.html
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If this station cause an overvolrage of ADC, then a notch filter will help. But it will be difficult to build such a narrow filter.
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I ordered a PE4302 attenuator board on Aliexpress. But, if you look at the photos, unfortunately, it is impossible to use a serial control bus. The leads are soldered to the mass. Therefore, it will be possible to use only a parallel control bus. Bu…
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Thank you John! Now there is hope of upgrading KiwiSDR 1. There are attenuators that are controlled via USB. But the price is high. https://forum.kiwisdr.com/uploads/769/JDDUV4O6BOAI.jpg
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Thanks for the answer! However, the PE4302 has a serial control bus. But it doesn't matter now. We won't be able to connect it to the FPGA on the first version of KiwiSDR. Or the new KiwiSDR2 software should have support for an external attenuator.
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@jks, hi John! How is the PE4312 attenuator controlled in the new KiwiSDR? Directly via GPIO or via FPGA? On Aliexpress, you can purchase a ready-made attenuator board based on HMC472 with the same control as PE4312. But the bits are inverted as I u…
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@k6fod If you are a KiwiSDR admin, try adding this script to the Additional HTML/Javascript for HTML field. <script type="text/javascript"> document.addEventListener('DOMContentLoaded', function(){ document.getElementById("id-ba…
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@jks, you don't have to worry about noise in the power circuits. They are almost invisible and do not interfere. At the expense of the SPI bus, chip breads is a good barrier to a digital bus interference source. But you need to take into account tha…
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Another interesting point. I also have a KiwiSDR clone that works with the Radpberry Pi 3B board. The frequency of the SPI bus is the same there, 48 MHz. However, the main source of interference is at 120 MHz, unlike KiwiSDR, where the SPI bus makes…
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HB9TMC Most likely, SMPS interference is emitted by the antenna cable connected to the SMA. Most likely, from its shielding. I tried connecting either the main antenna or just the GPS antenna. When only the GPS antenna is connected, I also observe t…
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I see. This was to be expected. And here, most likely, it's not about the load. The capacitor makes the pulse fronts flat. And at a frequency of 48 MHz, these pulses can no longer be recognized. As far as I understand, there is a parallel data bus t…
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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.