n6gn
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To the best of my knowledge, WF bins are each 1/1024 of the total span. I think the levels reported by the comms side more or less match what one 'reads' visually from the WF display. Be careful not to read to much into WF levels/bins though. It is …
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One of the great benefits of an SDR like the Kiwi which has a controlled and known gain path from the input connection to the detector is that it is, in theory, possible to make absolute signal and noise measurements. Furthermore if the transfer fun…
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IMO, this is an important problem. wsprdaemon calculates noise using two different methods, one looks at the (expected) quiet period at the end of the 110 second WSPR frame and the other looks at a value calculated over the entire frame. Not surpris…
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Thanks jks ! I just tried it using an offset of 527987.5 and after reload at the browser got a display and calibration of an over-the-air 548.309440559 HDTV carrier (rubidium referenced, I think) to read within the limits of the (rather dirty) no…
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In looking at it, do you see any way to remotely set the "frequency scale offset" mode, either by the URL or otherwise?
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OK, that's better than nothing but not really quite optimum since a given Kiwi may be used on both HF and and a VHF/UHF converter where HF is 'perfect' with no residual error but a converter might have some. The ADC adjustment affects both so each c…
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But still only to the nearest kHz, isn't it?
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@studentkra that's another good reason that a software correction of both WF and Dial would be better than a hardware one. The Si5351 can be pretty clean if/when small, even integers are used in the frequency generation plan. But if small offsets …
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This is an area that interests me in that I would like to see an API that will allow changing the scale programmatically to match user tuning of the 0-2 GHz Frequency Extender I have designed, built and which is now operational. I'd like this for b…
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At the urging of Tom, WA2TP, I created a GPSDistribution PCB which isolates both the center and shield of the coaxes of up to 8 Kiwi's from one another at all but GPS frequencies: https://forum.kiwisdr.com/uploads/629/SSR5LF5RV33G.png It has an addi…
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@jks would be the one to comment on diagnostics but do be aware that there is significant radiation from the SMA connectors/end of a KiwiSDR that can pretty easily QRM the rx. If you haven't already, move the antenna at least 15' away from the SDR a…
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That's my understanding. The internal code has a value it calls "clock frequency" and if that matches actual external input then there is no error. When I first tried an external Bodnar reference on a KiwiSDR a few years ago, there was a …
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If it isn't exactly 66.660000 MHz I think there will be frequency error. Isn't having a correct clock the whole point?
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Photos of the Antenna Switch https://forum.kiwisdr.com/uploads/Uploader/5f/492f44efb5a272d715c5219da67b44.pdfare fuzzy but do show one of my Kiwis with an attached Bodnar coax: https://forum.kiwisdr.com/uploads/713/E4CO9VTEGJG1.png https://forum.k…
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Have you set the callsign/grid under admin:extensions:wspr?
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>>>>. I am not sure why since only one station drops their power level. With two strong stations [30] kHz apart, you get a family of IMD 30 kHz apart - that is to say 'lots of spectral lines'. N*F1 +- M*F2. With a single strong statio…
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It's not into OV but is indicating -18 dBm on a monster 1500 kHz signal at about 1400 UTC http://forum.kiwisdr.com/uploads/315/1OEZIYDSD51K.png I'm surprised at that extreme level that modulation peaks aren't pushing it into OV even without power in…
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Show us the spectrum...
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You likely have noise current from a bipolar SMPS switching at around 30 kHz and its harmonics getting into the spectrum. Possibly the source went off at 1630 and (less likely) the coupling mechanism changed. The waterfall is not a good diagnostic …
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Notice that the KiwiSDR already has this: http://forum.kiwisdr.com/uploads/867/DV9ZK9462HHU.png
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No. Probably no more than a few loop diameters is enough to get into a slowly varying region. From my measurements at MW, moving up 10-20m probably helps SNR slightly but not grossly.
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How close does an off-Internet BB/Kiwi become if one checks "Set date from GPS" on the admin page? I think I've proven that this is fine for synching WSPR spots when portable but I don't think I've ever checked to see how accurate it actu…
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A 100W transmitter directly lnto the switch would be +50 dBm which with 60 dB of isolation (if that's the value) would be -10 dBm into the Kiwi and maybe triggering OV but not hurting a thing. I suspect that a Kiwi can take +20 dBm ( 100 mW) and p…
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I either simply do not use or remove the wire&ground antenna connector on the KiwiSDR. This is because there is significant difference between the SMA and that connector's ground paths and common mode current through it can significantly raise t…
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Ben My guess is that the source is sharp edges on a bipolar SMPS in some piece of equipment. These edges are likely producing a spectrum of 29 kHz terms but the coupling mechanism is really the question and there are many possibilities. It would be…
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It sounds like the PMIC on the BBG did what it should and saved the day for that portion. If it was me I think I'd isolatedthe KiwiSDR board and see if perhaps only the power conditioning there died. The differential choke, T301, right at the barre…
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Kevin, Yes, you can run a Kiwi with WiFi. Like most things in this arena there is more than one way to do it. Some have used USB WiFi 'dongles' with suitable changes inside the Kiwi which can be found on this forum. I chose to do it with an inexpen…
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Per Tom, WA2TP's success, I've been running BBAI/Kiwi with extensions, inside a standard enclosure for quite some time now. I've used an external fan and a 3D printed shroud to force air through which keeps the temperature in the 40's. My main reaso…
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I've run 100W transmitting in the environs of Kiwis and other receivers on nearby antennas with no damage. With care in positioning/polarizing, I've even been able to run full-duplex from a single QTH that way. I think there may generally be far l…
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Also, be aware that the S-meter 'hits the pin' and won't display values lower than -127 dBm, thus it is necessary to assure enough noise bandwidth to generate a larger reading, A 1 kHz BW though it might help dodge coherent signals may not be high e…