n6gn
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Ah! It hadn't occurred to me that a local user had higher priority than a wide area one and therefore special permissions. This points to either Rob or one his designate admins to having caused the problem. But of course his secret is safe with us,…
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You can test this yourself by driving across the ends of the PCB from a 50 ohm swept HF source at a known power level. Calculate the current through the ground planes and compare that to the Kiwi's response, which should have a noise floor around -…
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Every SMA on the antenna end of the rx probably should be isolated and not just for consistency. This is because attaching any of them to the enclosure creates a CM path through the groundplane at that end of the PCB and an attendant IZ drop which …
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Thanks John. If I can arrange the the timing to have the new subnet up after a reboot but before the BB looks for a network that could work. But if I'm too slow, doesn't the BB just sit with no network at all if the new subnet isn't , having genera…
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Steve_MWC asks: "Lastly, the transformer is really not operating as a balun. Both sides are unbalanced but isolated. Does anyone actually want to connect a truly balanced input to their KiwiSDR. Perhaps using balanced feedline rather than coax?…
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As I recall the T1-1 was spec'd at ~1 pF inter-winding capacitance so I'd expect whatever they are using inside the FTB-1-6 to be 6 dB worse for CM. The T1-1 is in a bigger package and probably has more core material than the ADT1-1. T1-1 (blue) …
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I'm coming to this late so maybe I'm missing something you've already tried but it would seem that D3&D4 should definitely be moving around. Maybe they aren't stuck by the ADC (now replaced) output but by the input they are driving? This would …
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It's also possible to pop the plastic top of the CMC with a thin flat blade screwdriver, cut the winding connections two at each end and jumper lengthwise in place of the disconnected windings. This avoids having to heat up the pads to remove the …
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I find a measurement of diurnal (propagated) noise variation to be the single best indication of station quality. It's influenced by latitude , MUF and solar cycle but does correlate well with WSPR spotting performance. Looking for a single metric …
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Have a look at the better WSPR/FST4W reporters to get additional insight into what is working well. http://wspr.rocks/topspotters/ again, not a perfect metric because it's dependent upon geolocation., MUF and latitude,but still very useful. Glenn n6…
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I suggest being a bit cautious about simply grounding the SMA's, HF antenna and GPS, to the enclosure. In so doing you are creating another shunt path for common mode current through the entire structure, That is, for example, current coming in on …
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Additionally on the off chance that someone reading this doesn't already use VE3EN's site: https://www.solarham.net/
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We do indeed have pretty impressive grayline/chordal reports. If you had spectral spreadingvalues for some of those I'd not be surprised to see some exceptionally low values as well. Amazing indeed ! Glenn n6gn
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"I also suppose this means we should be relieved all the MW/SW broadcasters are not carrier-locked with GPSDOs, for similar reasons.." That's true but their audio peaks are all perfectly aligned and 6 dB bigger than the vector sum of all t…
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Thanks John, Yes, it seems to have returned to the previous performance. Audio distortion seems low although I may still be hearing something happening at higher deviations (not sure) and I can still hear background sub-audio, 100 Hz in the case of …
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I'm not current on all the possibilities but FET switches aren't saddled with the junction potential of bipolars and can exhibit very low on resistance. For low cost components, I tend to look at current wireless products, especially mobile phones, …
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The newer version of the PE4302 31.5 dB step attenuator I've used, the PE4312, is spec'd https://forum.kiwisdr.com/uploads/032/IEUM39EBZ6GE.png I presume things change at LF but they also say: "Covering a 31.5 dB attenuation range in 0.5 dB s…
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After killing Rx1, rx0 continues to show no drift even after multple reloads.
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With both rx0 and rx1 running the same IQ extension and same 25 MHz it appears that neither drifts significantly. RX2 -RX8 continue to be listening to WSPR.
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After 1.586 with 66.60 MHz clock staying perfectly sitll, LOS to WWV25/NIST, 1.590 drifts 1 Hz/minute, clockwise on IQ extension.
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You are sure right about it being small. Even for FST4W at HF I think the spreading it introduces is fairly insignificant for almost all ionospheric propagation, though maybe for chordal propagation (an interesting mode ! ) it might start to be sign…
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Notches or, even better, multiple tracking BPFs that follow the selected rx frequencies would be even better but are more complicated and expensive solutions. Each site needs to tailor the HW to the individual problem it experiences and this probl…
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The version updated correctly on the 2nd try. I know of nothing different from first try. FT8 now showing up. Sorry for the false alarm.
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But I see the problem. Though I updated, it didn't take. Still running a previous version... Let me pursue the reason for that failure...
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Seems to be https://forum.kiwisdr.com/uploads/564/18BVLKXJAF6Z.png
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I wanted to try the FT8 and updated successfully but no FT8 option appears on Admin or User pages. I do have an (old) Antenna Switch extension present but it seems as always. What obvious thing have I done wrong? Glenn
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Wouldn't that be replicating PSKreporter? Why not just post to it and then link to their mapping?