n6gn
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I'd like to present a differing opinion from elitedata who wrote "if the coax connection between the Kiwi and the Loop antenna was 100% secure and isolated, turning off the preamp to the Loop would produce very quiet results on the Kiwi except …
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But WSPR seems to work properly and get Internet time when no GPS is present and an external clock is used.
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I have indeed seen interference that has similarities to what your detecting. Listening on your Kiwi near 20 MHz, it appears that there are two different source families which are not synchronous. In addition, their spectra (generally it is really …
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How do I measure degree of time-coherence of the clocks and their effects on any interesting received information? In what measurable way does it matter?
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I should think that external clock edges of the same frequency are synchronized to within a fraction of a nanosecond, though I have no way of testing or demonstrating this. If you can provide a two-kiwi test to measure it, I'd be happy to try it.
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Not sure if I got all the parameters in but http://n6gn.no-ip.org:8074/?mute&sp&iq&f=25000:0,20&ext=iq,off seems to let one examine the phase of the Kiwi w/ Bodnar against US NIST.
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A Bodnar GPSDO + single logic package provides outputs for 3 kiwis easily.. Generally this is accurate to <1 ppb on any connected kiwis. Simply inject the 66.660000 fanned-out external clock into the kiwi via small diameter coax at the pads provi…
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I sometimes run a common GPDSDO derived external 66.660 MHz clock to correct and synch frequency. But for time I have no solution that gets multiple kiwiSDRs exactly synchronized.
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I think an RPI might do very well for that purpose. To my recollection, Rob has been using one with up to 20 separate receiver processes on WSPR that way. I'm not sure how it will do on a busy band with FT8, the number of spots/15 seconds can be pr…
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Rob is out of town for a bit so may not be able to indicate public availability for a short while. Per his comments I gather that several of us are running v 2.2d which includes support for merged receivers.
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N6GN/K, N6GN/K2 & N6GN/K3 from Fort Collins, Colorado running 5-21 receivers on 1-3 different antennas, using AI6VN scripts.
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I agree, it would be useful to know how close to the top one's setup is so that it could be optimized. My situation changes quite a lot between day and night as MW broadcast stations change their ERPs and patterns so it takes some study to sort out …
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I show a simple HPF/atten solution that works well on the splash image at one of my home Kiwis This is a 8-component form of (3) above and works well with my very broadband short (6') dipole which is essentially back-back monopoles, each running in…
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Yes, there's a chance. On my list of interesting projects is a fast-switching block converter. Essentially this would be a transverter (up/down converter) to an IF above the highest frequency of interest, perhaps 3+ GHz. This uses an LO synthesiz…
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For me it isn't about where they tune, I certainly don't see ham bands as being special that way. But I do object to 24 hour 'use' of a channel and automatic re-login on after the 'user' is kicked off. It appears to be a machine rather than a human.…
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Although I was thinking of doing only at the receiver's input, I agree that the whole issue and the need for it is a bit disheartening. It sounds like they are using the same modulation pattern on multiple carriers. That would tend to imply that the…
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After knocking it down, you could jam it locally, just within the receiver. A PIC or Arduino and a single SiLabs synthesizer can do it easily and cheaply. You can probably get 3 channels in case there are some other 'favorites'.
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Has anyone else had a user in St. Petersburg, Russia hanging out for long periods of time and re-logging in immediately when kicked off? I can't figure out any good reason that the Global Comms frequency of the USAF should be listened to for hours b…
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I have found it very worthwhile to use toroidal 'choking' in the form of a Guanella balun simultaneously on all lines going in/out of my KiwiSDRs. (Image) as shown in the bottom portion of the figure. Like the situation so nicely described by G3T…
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My Moto e5 Android 8.0.0 that previously did not work now works.
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Comcast using Verizon on my Android 8.0.0 phone that is not working. Kindle updated to 5.3.6.4 with Silk continues to work fine.
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Not yet offered. Still running the 8.0.0 from October. I'm not sure it's possible to get it until it's released by the provider. The page does run just fine on an older Kindle Fire, Sept 2018 5.6.2.0 with a "Silk" browser. Waiting for a…
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Very possibly the source is power mains related noise. The question I have is how does it couple to the kiwi. I suspect a near-field effect rather than far-field (inverse square law) radiation. The latter is hard to do anything about but much rare…
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Upon rechecking this morning I find that after a minute or two, it enters a normal display. There is evidence of a waterfall having been recorded, as in cache or something, but no sign of new data. Status indicates "Audio underrun", flash…
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Correction. SW update was in progress! waited and now I get past the "click to start" and am able to select modes. No sound though. Waterfall not running. Doesn't look like splash screen (customized) ever came up, at least not the image …
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It does nothing. No waterfall. No sound. No interaction. semi-transparent "Click to start..." over control and normal screen. I'm not certain that it ever worked on this particular phone. I think it has previously but not sure which phon…
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Can't get past it on Android 8.0.0 running on a Moto e5play phone with a (mobile) Chrome browser. PCs, both Linux and Windows fine.
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sure enough. ~135.43 carrier (low space with 340 Hz shift gives a 135.6 center) with FSK. It must not have been sending when I first looked at it. Sure is big! As you say, that it's like that in the presence of any kind of notch filter it must be ex…
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It doesn't seem to be 135.6 but rather closer to 135.4, I doubt the calibration is off 1%, MSF? at 60 kHz looks OK. It looks more like a SMPS coupling into the Kiwi. Rather in the territory for an LM2596. Sure is big. At ~1650 there seems to be ~…
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How about a spectrum instead, there's information in that display that is hard to see in the waterfall.