studentkra
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I carefully studied the photo and it seems to me that the copper paths of the input and output of the attenuator are cut. That is, attenuator is completely disconnected from the circuit.
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I assembled such a 5 volt power-on delay circuit on the NE555 chip. However, I had to use a MOSFET transistor to control the relay. The NE555 output voltage was not sufficient to turn on the relay. https://forum.kiwisdr.com/uploads/195/YTJVIKJ1F0JK.…
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All linear stabilizers work well. There is a slight difference in the noise introduced, but this is not significant. However, with large capacities there is a need for a delay in turning on the output power. When turned on, the capacitors do not hav…
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Let's finish it and delete this topic as it has no relevance to our KiwiSDR forum.
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Yes. This is bad frequency! Your should not listen it (((
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What input signal level can damage the PE4312? I'm ready to check it out. But I don’t have the necessary equipment (do I need a signal generator?) A similar attenuator PE4302 costs 0.8 USD (PE4312 1.4 USD) on Aliexpress including delivery.
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I successfully use an external attenuator for KiwiSDR1. The attenuator is assembled on the PE4302 board and ESP8266. Control is via USB connection to KiwiSDR. The attenuator works in a simple automatic mode. At night, a signal attenuation of 15 dB i…
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Hi! Look at this topic. https://forum.kiwisdr.com/index.php?p=/discussion/2942/24-hour-waterfall-capture
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On Saturday evening I finished installing the linear regulator in place of the LMR10530 and connected this KiwiSDR to the internet for an update. The default version was installed on BBB, as I was told. I'm not sure, but it was Debian 11 or 10 versi…
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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.