studentkra
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- studentkra
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I wanted to install a temperature sensor too. I found some NTC7717u sensors in SOT-23-5 package on old laptop motherboards. The sensor works on i2c bus and it would be easy to install it on KiwiSDR board. To display temperature KiwiSDR server reads …
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The LMR10530 had zero resistance between the power input and output after a thunderstorm. However, it also had a resistance of 5 Ohms to ground at the input and output. Perhaps this saved the FPGA.
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I have long wanted to try replacing the SMPS LMR10530Y with a linear one. Since this SMPS is out of order and I do not have the opportunity to buy an original or an analogue, I still used a linear one based on the uPC7706. Measured current consumpti…
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Martin, thank you. I'll think about replacing my LT1084 with LM338 . No changes to the adj schematic are required. They have the same reference voltage.
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https://forum.kiwisdr.com/uploads/513/KQESX9H4N7LS.jpg I have three SDR receivers and a linear power supply for three channels of 5 volts. I'm using an LT1084ADJ in a TO220 package. It has been working around the clock for over a year now. And I thi…
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It is theoretically possible to do the opposite. Implement KiwiSDR support in OpenWebRX+. I think it won't be very difficult, but I'm not sure anyone would want to do it.
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Most switching power supplies change the frequency of the converter depending on the temperature. Not much, but enough to notice it at the waterfall. If it is not possible to disconnect the power source you are testing from the mains, simply heat it…
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@IK8SUT , I don't have a diagram. This is a classic power supply consisting of a step-down transformer, a diode bridge and a 1084 linear stabilizer. I used a toroidal transformer from a BBK household amplifier. The secondary windings of this transfo…
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If anyone is interested, I use a linear transformer power supply. I have three SDR receivers. One KiwiSDR, one FlydogSDR and one RSP1A running Orange Pi4 lts. I also use a Microtik LTE router, an ethernet switch, and active loop antenna and a downco…
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It seems that in the code that the user receives, the tab sign is replaced with "/t". If you don't use tabs in javascript, then everything works.
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It looks like the Kiwi SDR server now inserts special characters into the text in the "Additional HTML/Javascript for HTML" field. This violates the integrity of the javascript code. You can use a minimized script (this is one line of code…
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@LacekHUN , I looked at your KiwiSDR. I see an error in the formatting of the script. Special characters are inserted into the body of the script. Try deleting and re-adding the script on the admin page. Use Notepad or something like that to copy an…
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I didn't know anyone was using this script))) I will look at what is causing the error and try to fix it.
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Thank you, John! I have long wanted to ask you to reduce the interval of automatic SNR measurement. Now it's 10 minutes. Was 1 hour. https://forum.kiwisdr.com/uploads/037/7K6CRUJN3WQ5.jpeg
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Martin, thank you! Of course, I'm going to make protection against increased voltage at the output. And also a time relay with a power delay. I use a linear stabilizer LM1084 or something from this series. But it's been half a year, and I don't have…
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My linear power supply unit. It has three channels of 5 volts, 3 amps for 3 SDR receivers. There is also one 12 volt 1 amp channel to power the active antenna and the 4G router Mikrotik. https://forum.kiwisdr.com/uploads/249/6C8YML6GXCCX.jpg https:/…
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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.