ka7oei

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ka7oei
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  • I happened to have a KiwiSDR enclosure on back-order at Mouser - which still shows expected arrival dates - but just now got it cancelled as they are claiming that it is a discontinued product. Not sure what to think of that.
  • The BBAI in question has spent most of its life (about 7 months) running at 1 GHz with a cooling fan, so it hasn't had much opportunity to thermally-cycle - but based on the nature of the failure, I suspect that a mechanical failure has occurred on …
  • Although intended for monitoring mains voltage, I did a somewhat similar thing using the ESP8266, described here: https://ka7oei.blogspot.com/2020/06/an-esp8266-based-temperature-humidity.html The source code is linked, and making it read supply vol…
  • I have seen several situations where the "old" router/switch was replaced with one that happened to support POE (Power Over Ethernet) - and the world of MW/HF/SW reception ended at that point. In all cases where I was involved, that new, …
  • I would simply mask the 11175 (USB) frequency: For this case, I set a 1 Hz wide mask which causes the audio to mute, but produces an invisible line, unless one zooms way in.
  • I have one of the Newark fan capes and at nominal room temperature (70F) it is barely capable of keeping the CPU at an acceptable temperature when it's running at 1.5 Gig. The main problem with it - like many similar fans - is that it just can't pu…
  • John, That did the trick - thanks for the help and all that you do. Clint
  • Thanks for that suggestion - here is what repeats again and again in the 100 lines: May 6 20:18:39 beaglebone kiwid: 00:00:00.623 KiwiSDR v1.390 -------------------------------------------------------------------- May 6 20:18:39 beaglebone kiwi…
  • Apparently something still isn't right: A "ku" gives me this: systemctl --full --lines=100 stop kiwid.service || true systemctl --full --lines=100 start kiwid.service || true An "ms" yields this: May 06 05:29:15 beaglebone s…
  • Thanks, John, for the clarification in the build/install steps: I re-did things (other than delete/rename the old build directory and then do a Git Pull) and it now gets all of the way through, with no errors - but it simply finishes with this: …
  • Hi, It trying to get the Kiwi working on the BBAI I end up with this in response to "make install" (Re: Instructions at the top of this thread.) make[1]: Entering directory '/root/Beagle_SDR_GPS' clang++-7 -Dv1_390 @../build/gen/Makefil…
  • I have four KiwiSDRs that I maintain and I had a 100% failure rate after 9-12 months of the fans supplied with the case: Three of these Kiwis were operating in a harsh environment (below freezing to >130F/54C) and one was not: The one in the te…
  • I have found the KiwiSDR to be quite durable when it comes to being able to tolerate a nearby transmitter with no damage. On my main receive system I have added some external protection - essentially an outboard device that includes both a mediumwa…
  • The Synchronous AM demodulator appears to work very well, being reasonably able to lock on to rather weak AM carriers. I did notice that the SAM frequency offset indicator on the "Stats" screen will sometimes not appear: Switching to AM …
  • It's interesting that you are having issues with an ostensibly clean switch-mode power supply (SMPS) with everything else disconnected. Here's a bit if info on trying to resolve such issues. What you should expect: A properly-functioning KiwiSDR …
  • Phil, isn't it really weird that no-one is using Mr. Walker's wonderful VMSK modulation on the shortwave or other bands these days? I wonder why that is? :)
  • Verified what has been said: Have copied WINB on at least two frequencies (haven't manage to catch the 3rd yet). Although listed as being centered on 7315, 9625 and 13690, it appears that only the upper half of the 10 kHz wide signal actually carr…
    in DRM Heard Comment by ka7oei January 2020
  • Although this may cause more acid spitting he said, during our very brief conversation, that it involved the use of the micro-USB port and gear that he'd used on other BB projects of his own. I have not talked to him since and that is all I know: …
  • When I see devices dependent on fans for safe operation, I get a bit nervous - but know that it's sometimes a necessary evil, particularly when space is confined: It goes without saying that one use a known-good brand-name fan. I say this consider…
  • I see what you mean about the power failures - and I'd never heard of this happening, either, which probably explains the lack of search results. Previously, when all three Kiwis were offline, we were able to attribute it to the pair of linear pow…
  • Well, that is a strict, technical explanation why it happens to be displayed the way it is which is certainly useful for one unfamiliar with the process. I guess the comment/question had to do with the visual presentation of the available data rath…
  • Not related to the waterfall scrolling issue per se, one thing that offends my slight OCD sensibilities is the way that the audio-only waterfall (on RX2-RX7) is represented when using LSB: It's "backwards" - that is, the audio waterfall d…
  • Peripherally related to this topic, I recently re-did the splitters for the KiwiSDR set-up at the Northern Utah WebSDR. In the process, I analyzed several MCL devices that I had on-hand (I did not have any devices that would be specified optimally …
  • Another version that will do a similar thing is here: (Image) Unlike KA7U's version, this will fill the entire screen, no matter the users' browser/computer capabilities, and the vast majority of users will not be aware that there is a frame. As…
  • Thank you all for the answers - I hadn't really dug around in the directories to find "unused" graph data (even the "old" band data files seem to have had been accessed by the system recently) - but this just goes to prove the ol…
  • I recently did some work at the Northern Utah WebSDR to fix a signal path issue on the KiwiSDR that had been excessively attenuating signal below 1 MHz and have consequently restored its ability to hear the band's noise floor on 630 meters (2200 sti…
  • For a Kiwi at Northern Utah WebSDR, I did this, which you may see by going to http://sdrutah.org/kiwisdr1.htm I tried to copy the html here, but it got "munched" by this message board so you will have to look at the above link, yourself.…
  • In the past I have checked the calibration of the noise graphs by placing a CW carrier of known amplitude within the WSPR passband. It's been a while, so I don't recall the details, but I do know that a persisting CW carrier can have a similar effe…
  • I noticed a "problem" that puzzles me: On around the 27th of October, I noticed that the "KA7OEI-1" WSPR reports from the Northern Utah WebSDR system disappeared from both the KB9AMG and WA2ZKD statistics (I only checked those t…
  • With the recent change (1.337) I notice that the noise graphs at the Northern Utah WebSDR (KA7OEI-1) on Grafana and WSPRDaemon.org have shifted upwards (noisier) by between 4 and 5dB. I presume that this has something to do with the change in the m…