studentkra
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Hi, Martin. How did you take the measurements? I am most interested in LT1083. My linear power supply has 3 LT1083 pieces. There are also L7812 and L7805 and the like. But I used good LC filters for the output voltage. Should I be worried that this …
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Yes. Look at this topic. https://forum.kiwisdr.com/index.php?p=/discussion/2507/wf-ceil-floor-default-values-fixed-in-v1-491
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I understand. Trying to optimize the source code in most cases makes it very difficult to understand it ))
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Yes. But my solution to the problem was accidental))) I didn't figure out what the kiwi_reload_page function does! Or I didn't want to)))
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I checked this in Chrome on Windows 7. But Chrome is a old version. I'll check later on the updated Chrome Windows 10.
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I tried window.open(s, '_blank'); Instead of kiwi_reload_page({ url:s }); In sendmail function (kiwi_util.js). It seems to be working.
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Incidentally, studentkra has a working prototype auto attenuation script that may be of interest to you. I will post this script here. This is just a demonstration. I will also attach a link to a short video. This python script controls an external …
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Martin, thank you. Your schematic from rfsim is very simple. I should repeat it and analyze it. I have several frequency sections where I definitely need to lower the gain. It is about 16 MHz and about 4 MHz. You have a link to my private KiwiSDR. Y…
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Martin, thanks for the answer! You are absolutely right, using an attenuator in this case is very simple, but not an ideal solution. In my area there is no overload at low and medium frequencies. There are also no overloads in the upper shortwave ra…
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Hello, friends! It has been a long time since the discussion of the attenuator began. I would like to know if there are any results on the automatic control of the attenuator? Temporarily I implemented such a scheme. The gain of my antenna is about …
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I have read this message several times, but I have not understood its meaning. I also did a lot of experiments with different power supplies, and realized that there are three types of noise from SMPS. 1) The noise that KiwiSDR receives over the pow…
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I have everything set up and connected. It works! https://forum.kiwisdr.com/uploads/062/FGLB70Q8F8ZH.jpg https://forum.kiwisdr.com/uploads/532/LXTYJLIOS4IJ.jpg https://youtu.be/5CCX7GBT0-I?si=uzYIwxgaKSJBdm9k
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https://forum.kiwisdr.com/uploads/354/6KAPW491F6B1.txt The web interface and the admin settings page stopped working on the original Kiwi. At the same time, ssh access was still available. sudo reboot partially solved the problem. But the Internet h…
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It looks like a periodic reading of the kiwi.json file causes the system to crash. I did this with the original KiwiSDR and with a Chinese clone. And I don't want to do it again ))) Well, I will look for other ways.
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You have an automatic web page translator enabled. Disable it or prohibit the translation of only this page. Hai un traduttore automatico di pagine web abilitato. Disabilitalo o proibisci la traduzione solo di questa pagina.
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John, thank you again for your work! You're doing impossible things! We will not distract you from your main work. I just want to do some research into the work of the attenuator. And so far the only way to get rf_attn values from a json file. Moreo…
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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…