jks
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- jks
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Hi David. Very nice. VLF/LF signals are a particular interest of mine. For a different kind of image set draw/mode/PLL to density/carrier/off. And use GPS correction of the ADC clock, or careful manual calibration against WWV 15 or 20 MHz. You shoul…
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Now working.
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See where it says "Config: v1.2"? This means what you're running is the factory image, which is incredibly old (2016). There is no point in backing this version up. Now, how did you get here? This can't possibly be the version you've been …
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On the admin page. See below. https://forum.kiwisdr.com/uploads/489/N02DEAE8AHIX.png
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Not able to duplicate here so far. Very interested to hear if anyone else sees this problem. Does the output of the dmesg command (run from admin "console" tab) show any error messages that look like eMMC write problems? (the Beagle's file…
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Okay. I made some improvements anyway to log errors from the copy commands.
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Well, if the guy is not going to merge Christoph's changes then maybe we should just incorporate all his work into kiwiclient. MIT license after all..
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I don't know exactly. If the underlying Linux copy commands fail with an unexpected error then the returned error code is shown as a numeric value. Any of the expected errors are turned into error messages. I'd have to add some prints to the code to…
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Re: SV1AFN switch. It says 3.3V compatible. Just make sure it's configured that way and has no chance of back-feeding 5V into the Beagle/Kiwi P8 header pins. That would take out both the Beagle and the Kiwi.
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per Christoph as of today "The python libsamplerate module is broken" I'm sorry, I missed this. Where is this stated? (for future reference)
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@G8JNJ That's what I was thinking too. I'll have the prototypes built with those and see how it goes.
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I see now there is this comment in the code. So maybe there was an issue when you tried it last: ## work around a bug in python-libsamplerate: ## the following makes sure that ratio * 512 is an integer ## at the expense of resampling frequency preci…
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No, I think it's okay. I just tried it and the results sound fine. Both for small fractional resampling (12001 => 12000) and larger (12001 => 6000). And doing a make info, which causes the Makefile to do a sox --info *.wav, shows the expected …
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By "power supplies" I meant the Vcc into sensitive components like the ADC preamp, ADC clock XO etc (see Kiwi schematic). This is standard practice and every SDR does this kind of filtering. There is nothing I can do about the traces on th…
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Christoph added fractional resampling to kiwirecorder some time ago (see the -r --resample option). So you can resample on the fly from whatever odd sample rate the Kiwi happens to be producing to, for example, exactly 12 kHz. So take a look at kiwi…
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I think maybe the thing to do is add two 0402 pads. One near the Beagle header pin and one as close to the FPGA as possible. The distance between the two is roughly 13 mm (the trace distance is somewhat longer). And use ferrite beads at those locati…
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It is once again possible to use the SD card supplied in the original Kiwi product box to re-flash the BBG/BBB. A number of months ago that SD card stopped working due to debian.org having archived Debian 8. We have now found a way around this issue…
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It would also allow you to try some in-line SMD ferrites. Good idea. I hadn't thought about that. The reason there are sidebands is because the SPI clock is not constantly enabled. It is only active per serial packet transmitted. So for short transf…
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I tried that actually. The smallest caps I had were 22 pF. The FPGA would not program with those in place (the SPI bus is used to program the FPGA as well as communicate with the FPGA afterwards). The buffers on the Beagle and FPGA are not meant to…
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Today I found that adding a 66R series "termination" resistor to the SPI clock trace on the Kiwi board seems to reduce the relative strength of the 144 MHz harmonic by around 6 dB. Termination in quotes because I have no way of calculating…
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I split this sub discussion into a new thread called "Kiwi V/UHF noise" because the number of posts is going to make it more difficult for people searching for information about KiwiSDR 2.
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We're still working out the details. But I will specify a right angle SMA that uses a continuously threaded barrel, as opposed to the ones that have a straight section followed by a short threaded section. That way you could remove the insulating wa…
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If possible I'd be interested if you could run an experiment. This is to determine if the noise you're getting is really from the FPGA 1V SMPS or the SPI interface. Connect to Linux on the Beagle using ssh or PuTTY. Disable the normal background ope…
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Bug fixed in v1.624. Now able to import your .csv file. Not sure about the data loss problem. Hopefully there can be a repeatable test case with that.
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It was observed way back in 2016, and verified by me, that the noise floor at HF was raised slightly by having two points of grounding to the enclosure: at the SMAs and from the Beagle via the standoffs. So that's why the Kiwi extruded aluminum encl…
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Please send your .csv to support@kiwisdr.com and I'll try and understand why it isn't uploading. The occasional wipeout is very worrying. That isn't supposed to happen under any circumstances, unless you're doing something awful like pulling the pow…
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Okay, so I think this might work. Another idea my mechanical guy had: Simplify assembly and keep the insulation of all 3 SMAs from the enclosure (as was done with the prior enclosure) by using sleeved plastic washers. They would slide onto the SMA b…
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@G8JNJ Automatic control is an interesting idea. No reason why we couldn't experiment with an idea like that. Also, good idea about compensating the WF/spec for gain changes. Like we compensate now for zoom level changes. @k5mo The Github page for…
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I had said previously that KiwiSDR 2 would fit in the existing aluminum box. But of course this is not true because there is now a third SMA connector (ext clock and self-test). And also the horizontal positioning of the other two (antenna/GPS) was …
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The v1.623 release was mostly for the change requested by Glenn. But I added the "RF" tab and RF attn slider to get some feedback. I'm working on putting the antenna switch in there too, so you can use it while other extensions are open. B…