n6gn
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A spectrogram from the Kiwi in a wide zoom might be more useful than audio but, if I understand your description correctly, it would seem that in any case this is likely to be common mode (TM) noise on the coax, coupling on the feedling TL and conv…
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Be careful with N6GN/k2's Bodnar clock in the near term. Last trip up there the GPS antenna got moved to a location that turns out not to be great. It wasn't even locked initially but was the last time I checked. I'm not sure what will happen as th…
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John, Thanks, I think I followed that :) Your description does indeed fit my experience and clearly what you saw: said static, I thought 'static' but actually was DHCP. I did the same thing on a local Kiwi here but I'm not sure whether I hit th…
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Fine to do all those things when you're local, not so easy when 20 km distant and 800m up a bad road, covered in ice/snow and at negative degrees C!! It came up normally, lights did the normal thing until about the time the server should have arriv…
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I truly don't believe this is a power supply problem. I have seen the power supply problem previously with different PSes (e.g. HP bench supply that didn't have sufficient maximum current). But the part in this buck converter can source 3A @ 5VDC co…
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N6GN/K2 is back on the Internet. It took a trip to the (remote) site to bring it back up. Upon arrival the Kiwi did have power and looked normal but of course was still unreachable. Status of the 4 LEDs didn't get noted before its input power was c…
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And don't forget that these interfaces offer a common mode current path for noise ingress, something I'm finding to be a big deal in many/most Kiwi implementations. I'm interfacing my antenna switches using opto-isolators. I presently have some LTV…
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Thanks to all for ideas and suggestions. I expect to have a little more detail once we actually visit the remote site again (-2F/-19C here this morning!). In the past, the Kiwi has always restarted, so I don't suspect the power supply. On all my Kiw…
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Thanks John, I was afraid of that :'( I think a trip to the hilltop is in my future... Glenn
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It really is a (pleasant) laugh with WSPR sometimes. What we think of as "quiet" and what it sees as quiet can really be different. I once left an extra WSPR instance running, sourced by accident by a built-in laptop microphone, across th…
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OK. I suspect that unless one can get the carrier frequency and phase correct, truly position the carrier correctly, that perhaps it is no longer "hi fi" anyway. I think it's clear that the hardware could be made to do it but this does se…
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I'm suggesting just publishing the filter/atten response and saying where the S meter is calibrated. Put a note in about the antenna factor if you know it. Let the user put it together and calculate the field strength. As long as the information is …
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Use SSB coherent detect and put the filter around the whole sideband out to 10 kHz then. Heck, I can't even hear 4 kHz any longer! Glenn n6gn
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Ooops, that's what I get for doing it too quickly! Here it is with the 100 pf. (Image) one can move the peak around to suit. I think it would be helpful if Kiwi operators who have a public presence and are able to do it would put this sort of inf…
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Martin, The Zobel configuration is interesting. Here's what I get from QUCS about it: (Image) Just to show that, like Unix, there are always multiple ways to solve a problem, here's another. I've been using a different configuration with similar …
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FB. That path is physically a lot like the original path from SAQ to the US. The antenna may even be similar, though I've misplaced my Alexanderson book and can't verify that. I think there were multiple Beverages, pointed like a star, to the other…
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From where were you listening? Glenn n6gn
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I've not been successful in compiling a WiFi module for the BBG. After trying for a little bit, I was little intimidated, I guess, so instead I just got a TPLink TLWR802N, set it for client mode and plugged it into the KiWi's RJ45. This works and …
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The key-up signal, called a "backwave" years ago, is a result of the magnetic amplifier that provides the keying. The actual alternator (tx) stays on continuously but is switched between the antenna and a 'dummy load' by the keying. This k…
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In the past I've sniffed GPS receiver modules in the hope of finding a stable reference. I've even used LN preamps and various probes and loops. All to no avail. I think most are pretty clean and RF quiet. (I'd wondered about that in the days of '…
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Martin, I appreciate your efforts toward understanding grounds and associated current paths. I've been poking around this domain as well and I think it is not a wasted exercise. I have other thoughts I'm not ready to write but I do want to comme…
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I think this is correct, that's how I generated these spots, by running on a moderately capable desktop. Judging from the relative performance of the KiwiSDR WSPR extension and other systems, I think asking an FT8 extension on the KiwiSDR to keep u…
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I just ran last night, streaming audio from my remote Kiwi into WSJT-X and decoding FT8 on 40m. I had no idea there was so much activity of FT8, over 2000 different transmitters in 60 countries! 30-40 spots every 15 seconds, can the BBG even keep u…
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This sounds like another ionosonde. There is one on the list Here from Juliusruh and these do point straight up. There are several in Europe. (Image) They transmit with approximately the rep rate you describe and look for returns to measure Fcri…
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Update to "Some Observations ..." A superseding update to the first article is attached. Here is the Summary: (Quote)
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Hey, N6GN/k2 was the 3rd spotter - and another KiwiSDR! (I had to look the call up, I thought it was a bogus spot at first :) )
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I was going on to another variable - detector type. Some want to measure and see noise displayed in a spectrograph. Others want to see peak of a signal that has, say, high peak/average such as SSB. If I can only have one detector type I chose to …
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OpenHPSDR has a check box (defaulted to checked) that normalizes each bin to 1 Hz. The spectral display/waterfall has it's own selection of detection type: average(multiple types) sampled, peak... I would be happy with an averaging detector that …
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I see that the noise floor displayed in the spectrum does change with zoom. However, for a given detection filter, say USB, the S meter is independent (separate process) as it should be. I take that to mean that the bin size is changing with zoom an…
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This behavior persists when run from a battery... It does not occur with other KiwiSDR boards run from the same power sources.