G8JNJ
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Hi All, Kari has performed some excellent work with his new extension. I've had the GPIO switching configured on my KiWi for the past week and it's working really well. Thanks again Kari :-) Regards, Martin - G8JNJ
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Hi Laszlo, I'ts difficult to get hold of variable capacitors with a sufficiently large range of adjustment, which is why I suggested using a variable inductor instead. Try a search for "Polyvaricon capacitor" like the AM/FM tuning capacito…
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Hi, The patch antenna supplied with the KiWi doesn't seem to be as good as some other GPS antennas. A lot of modern double glazing uses a metalised film to provide additional heat retention, but this also has the effect of greatly reducing the stren…
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Hi John, Understood, that's pretty much what I thought, but I wanted to ask as you had previously mentioned the memory allocation issue. Regards, Martin - G8JNJ
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Hi Phil, They are parameters associated with the Automatic Gain Control. The idea of AGC is to try and maintain a reasonably constant listening level regardless of changes in propagation or local noise. The characteristics can be changed to suit per…
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Hi John, I had a report regarding WSPR from David, G0MRF, one of my SDR users. "Last night I left it running for a while on 630m and when I returned 10 mins later, I saw 5100km as a distance. Hooray....Martin has nice antennas and a quiet sit…
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Hi John, I must confess that I hadn't realised (or read) about the <shift-left-click> option. That would seem to solve the problem, so I think this issue can be closed. Regards, Martin - G8JNJ
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Hi John, Ah OK. I had only considered it to be an admin configurable off-set on a KiWi by KiWi basis rather than a global setting using stored cookies. Personally I'd avoid anything that relies upon connection to an external site at all costs. The r…
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Hi James, Ah yes - I'd forgotten about that trick. Using 4:1 or 9:1 transformers is also useful when building diode RF limiter circuits. I haven't had to worry about really narrow notches on the MW BC band, so I didn't need to do that for my filter…
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Hi All, I would like to be able to switch antenna ports directly from the BB GPIO pins via the web interface and also change some text on the web interface if some of the BB GPIO pins are switched externally. Kari, OH1KK, has done a great job in wri…
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Hi John, Just tried the new decoder and it seems to work very well. Now I can leave the KiWi running indefinitely on the local connection, I'll monitor it for the rest of the day and report back. Any further thoughts about being able to run WSPR in …
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Hi All, I should have emphasised the point about choosing the appropriate L/C ratio. I suggest that you only use minimum depth of notch and narrowest notch width that you can get away with, in order to minimise the effect on nearby signals. Modellin…
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Thanks John, That's really good :-) Regards, Martin - G8JNJ
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Hi, If you take a look at the spectrum display, you generally need the strongest signals to be below the -30dB line. They can be slightly higher, but you may have problems if propagation changes and increases the signal level. If you want to have a …
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Hi, Here's my fix. http://www.g8jnj.net/softwaredefinedradio.htm#970952309 Regards, Martin - G8JNJ
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Hi James, This feature has already been requested as an enhancement. https://github.com/jks-prv/Beagle_SDR_GPS/issues/80 Please feel free to add any comments in order to add extra weight to the request. Regards, Martin - G8JNJ
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Hi Ron, Nothing so sophisticated as a script :-) I import the JASON file into Excel then find and replace the more obvious %20 characters and such like. There are already a few open requests for enhancements regarding Tag handling , sorting, editing…
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Hi Ron, Almost too many pirates to list :-) These are the ones tagged as such on my WEB SDR. 1611,AMN,Pirate,"Zender Kooieplaats ? ZendeRatlantic, Music Pirate"1618,AMN,Pirate,"Zender Curasao, Music Pirate"1620,AMN,Pirate,"…
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Hi Ron, I think it's one of the Russian CIS modes. The best candidate is probably CIS-128 as it has is about the correct bandwidth, has multiple modulated carriers with a missing carrier in the middle of the spectrum. http://www.sigidwiki.com/wiki/…
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Whilst monitoring another signal has popped up on an adjacent frequency. This one seems to occupy a narrower bandwidth and has used three different sweep rates, which is more typical of JORN. (Image) Regards, Martin - G8JNJ
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Hi, Does anyone have any idea about these signals which pop up throughout the 2-30MHz spectrum. (Image) They occupy about 8KHz of bandwidth, typically last about 2 seconds and often repeat every 10 to 20 seconds. I suspect they may similar to the …
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Hi John and All, This may possibly be an issue associated with WSPRnet itself. There have been issues with uploads in the past where the WSPRnet server couldn't cope with the upload demand at various peak times. I some work was done by Bruce W1BW to…
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Updated notes now added to my SDR webpage. http://www.g8jnj.net/softwaredefinedradio.htm Regards, Martin - G8JNJ
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Hi Jim, I'll do a better write up and put it on the SDR page of my website over the next day or so. Almost any small mounded chokes will do, but I found it important to use mica or polystyrene capacitors. Small ceramic may work but the 'Q' is often …
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A better version of the diagram can be found here
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Hi Ron, Sorry I think I may have mislead you with my previous post. I wasn't suggesting that it was HFDL, but I was using the screen grab to try and demonstrate what I meant about adjusting the waterfall controls so that it's possible to see more de…
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Hi Ron, OK here's a screen grab of HFDL (Image) I was suggesting that you adjust the waterfall Max and Min settings so that it may be possible to see any spectral lines and be able to count how many there are. This and the occupied bandwidth woul…
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Hi, Only a few countries have an Amateur allocation above 3.8MHz, mostly it's used for broadcast and utility stations. So it's almost certain to be Voice / Echo of Hope or Voice of Unification plus jamming. They tend to move around the same segment…
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It sounds a bit like either HFDL or CIS-3000, but the lack of sync tones and varying length of the data bursts suggest otherwise. Can you zoom in adjust the waterfall Max / Min settings so that it's possible to see the while spectrum in more detail.…
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Hi to W5UXH, Sure just leave it running 24/7 :-) There are plenty of low power 'beacon only' WSPR stations who would welcome being spotted consistently, plus having a much larger user base helps when using WSPR for antenna comparisons and propagatio…