n6gn
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jks, That would explain it. I really couldn't tell the model from the picture if it wasn't the same thing. But it is sure impressive how sub-milliwatts ERP do at LF. I transmitted a bit on 475 kHz with no more than 500 mW ERP, probably somewhat les…
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@smg Not to be too picky and it probably doesn't matter since it is all working usefully for you but... From your schematic do you believe that an air core coil of 15 turns x 60mm x 10mm is 1700 uH ??? I doubt that it is even 1700 nH. But I can…
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Really? http://192.168.10.89:8075/?mute&keys=yyys seems to work normally for me on v 1.701
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One absolutely can. Common mode current (not differential between pairs say) can be the most common cause of degraded noise floor. Current coming down the LAN (or PS), common to all conductors, flows into the 'ground' plane of the Kiwi (PS lines…
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https://forum.kiwisdr.com/index.php?p=/discussion/3520/interference-a-galvanic-isolator I suspect you are largely seeing common mode noise on the coax transmission line. While the loop antenna might have good enough CM===> differential isolatio…
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Pretty good that the PE4312 survived (if it did), enough to cook inductors.
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multi-page pdf, what will they think of next😀 How does one generate that, I've clearly been in KiCad too long and am out of touch with other tools! But the fact that of series L's, one burns up while the other survives it gets really interesting th…
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Wow. I doubt a pulse. Not enough energy to do this and not a lot of other damage as well. Maybe high power RF directly injected though. High as on the order of watts not milliwatts and for long enough to cause the heating/burning you see. Almost …
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I haven't checked for whistlers but I did go back and found that Alpha was Q5 in CWN on the 6m SA system here at the house: https://forum.kiwisdr.com/uploads/139/RPHQD5VZFGMR.png This at 1430 UTC from Northern Colorado and pretty far from any water…
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A couple of addenda: Solar controller power seems not to be a big deal as it only requires energy during periods of charging when there is a lot to be had. Our experience with snow at 7500' elevation in the Colorado Rocky Mountains is that while it…
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If I remember right, my remote+active_antenna+uwv_link is around 12W total with kiwi a bit less than half of it. Lots of places I think total storage can become the biggest deal but depends on days of sun/year etc.
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I didn't actually listen for it with CWN but you are probably right that I wouldn't hear it. This is from the very broadband Single Antenna system http://www.sonic.net/~n6gn/OSHW/BB/SA/SingleAntennaSystem.html only 15m from the house and neighbors…
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I remembered to look this AM from the house here in Colorado. I know nothing about Alpha. Is this it? https://forum.kiwisdr.com/uploads/654/7JQGRDZGPS1X.png
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Martin Have you ever checked to see if there's a noticeable improvement in performance by pointing the 'main lobe' toward the equator? From that spec sheet it looks like there could be several dB of directivity available. I've never checked to see.
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I've wondered the same things. Suppose we were to follow that last path; update the 'accessory box' originally made with the FE for Kiwi-1 but with the design updates from the REference2 & TRansverter. There's plenty of room in the origina…
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Seems to work well, Thanks John. About the only frill I can think of is to have a new frequency request search the available 20 MHz blocks for a match and, if found, do the selection for you. With that doesn't the Kiwi become pretty much a 0-2 GHz …
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This is my point as well. Differential QRN really isn't a problem in any of the many Kiwi's I've seen. The problems seem to always be related to common mode currents in/out and through the Kiwi's. At low frequencies it's certainly not "radiati…
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Yes, that was sort of the general direction of what I was wondering about but I suspect it might best be done at a high Z location, perhaps on the mains side. There total current might be 25-50 times lower than at 5V. Two buck converter SMPS that c…
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Getting rid of differential noise is fine, though the power management IC regulators in the Kiwi's BB is so good that this is seldom to never a problem, in my experience. (Try deliberately introducing differential noise and check the Kiwi's response…
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I think the question was reasonable since it was "using down converters". For this reason using a frequency converter/extender such as the 0-2 GHz transverter I use here suggests the value of having many additional bands listed as options…
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[I never thought I'd be saying this seriously but ] They seem to be on frequency compared to GPS constellation here in Fort Collins at 1440 UTC. Perhaps whatever you saw has been repaired? If not, I can get hold of Matt....
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Are we on the verge of trying to shoe-horn an entire instrument state into Antenna Selection? Should/could this be done better if there were simply a mechanism to call a separate process or script outside of FW that 'does whatever is needed"? …
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I think that's it. With the per-kiwi trick it almost works now. Assuming I also send a command to the local frequency converter to tune it as well, sending http://192.168.10.75:8076/?foff=120000.000&f=145200usbz0&mute&keys=yyys to a loc…
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I really haven't thought this through very well. The possibility to use Antenna Switch as a way to easily select among different offsets seemed appealing and not requiring reloading the entire page from a different URL and clicking a couple of tim…
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At the risk of topic drift I'd like to ask if there is a way to produce seamless Antenna Switching when it is used with computer control? I'd like to be able to change only the LO offset so that in conjunction with tuning a separate frequency conv…
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If it were me, I'd first take the antenna and GPS SMAs off, see if it goes away (it probably will) and then touch only the shield of the cable to the "ground" of the SMA to see if it might be common mode current through the Kiwi's ground p…
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Not seeing it on v1.690 but that sounds great. I really like the ability to use the Antenna Switch to change bands too. That lets me remotely configure frequency conversion and Kiwi dial, at least I think it does. Glenn
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Option of powering up with no DX labels, just spectrum, waterfall or both. Effectively the 'yyys' I do every time done for me.
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I worked in an HP microwave lab and as I remember the production line spec for torque was surprisingly low, only 7 inch-pounds. That was with quality connectors on the highest quality vector network analyzers as well as on swept signal sources. As t…
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It's not true that beam forming and noise cancellation can only work on a narrow band of frequencies. By using a broadband antenna system such as the quadripole I show on my web pages along with a multi-decade quadrature network, also shown there,…