G8JNJ
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@cx8bit I was assuming that the actual antenna on your mini-whip was of reasonable size. If you are only using a very small antenna 'plate' or similar then you may need to use a higher value of resistance such as 10K Ohms. However if you are onl…
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@W1EUJ Try it for yourself both antennas are using pretty much the same pre-amp and amplitude / frequency slope correction and BC band notches, Loop on the ground (just above it actually) http://southwest.ddns.net:8073/ TC2M http://southwest.d…
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Hi John & All Happy New Year to everyone. Even if it's not possible to decode DRM because the KiWI is occupied, could it be made so that you can still open up the DRM schedule screen so that you can select and tune to stations to see if they ar…
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Anyone had any luck with the WINB DRM Single Channel Simulcast (SCS) transmissions ? This one's on 13692.5KHz and is putting quite a good signal into the UK. (Image) Regards, Martin - G8JNJ
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Hi, > >remember I'm using a MW broadcasters bandstop filter to avoid OV in the MW section. > Yes OK, however the 'IMD' seems to be occurring at intervals of something like 33KHz spacing. If it was from MW broadcast stations I'd expect it…
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> >This will be a long update as a new compiler is installed and the DRM code takes 10 times longer to compile than the rest of the Kiwi code. The DRM compiled code >is cached so future updates won't take as long. > I notice that it's s…
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Hi Jim, Yes the Russians had a broadband vertical antenna that they nicknamed the 'Karrot' (or something similar) that looked a bit like this. https://www.antenna.be/vm.html (note, may flag up a unsafe but it seems OK). There is also this sort of…
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Incidentally it may also be possible to slightly improve the LF end by incorporating some form of lossy broadband matching LPF filter network as proposed by Fano & Witt et al and latterly by Cuthbert. http://www.arrl.org/files/file/Antenna%20Bo…
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I'm not sure about using bicones or the OE-254 which I think was originally designed for 30-88MHz tactical communications. The problem is that by virtue of them being balanced antennas each element is 1/2 the electrical length that could be achieve…
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I've used this method in the past, but it worked better when the users were always displayed on the control panel. When I changed my user ID to ask what some other users were monitoring, I ended up with quite a few on-air name checks from pirate br…
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Hi Chris, It's working OK for me. http://southwest.ddns.net:8078/?f=3965.00drmz8 EDIT - The drm flag in the url doesn't bring up the extension. Regards, Martin - G8JNJ
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Looking at the spectrum display I don't think it's overload from AM broadcast stations, as they are all below -40dB which suggests that the amplifier and KiWi are both well below the overload threshold. The spikes seem to occur at intervals of app…
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I put drm in the extension part of the DX tag and that worked.
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You will be able to hear most of them almost anywhere on the earth, and possibly beyond :-) Regards, Martin - G8JNJ
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Just a couple of additional thoughts following on from Stu's post. Both techniques of screening and choking are important, but they perform different functions and have to be applied appropriately. "Quad shielded" coax can be many things…
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It's Over The Horizon Radar (OTHR) https://en.wikipedia.org/wiki/Over-the-horizon_radar There are Six 'usual suspects' These four tend to sit on specific frequencies for long periods of time. Cyprus (Pluto) China Russia (Kontayner) Iran (Ghadir…
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I think your best option is to use Openwebrx running on a Raspberry Pi with something like an Airspy or SDR Play. https://github.com/simonyiszk/openwebrx/wiki Regards, Martin - G8JNJ
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> >When the S Meter option is selected can we have a readout in S points as well as db - This would be more user friendly > I think it would make the text too small to be useful and it's very easy to quickly read S points from the bar grap…
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Hi All, Just to conclude this thread. With help from Rob and Stu I have now got wsprdaemon 2.5b running correctly on a Raspberry Pi. The problem was that I had been editing the files on the Pi using Notepad++ whilst connected to the Pi by means o…
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I'm struggling with this. I've so far spent two days and three Raspberry Pi clean installs from scratch (reformatted SD card and reloaded OS) and I just can't get 2.5b to run properly. Has anyone done this afresh rather than upgrading from a previ…
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Hi Stu, Oops, that was just a typing error in the posting. The actual entry is correct and I can connect to the RasPi on that address. Some parts of the daemon seem to be running, but it all worked perfectly OK before I messed around with it. Re…
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Final update.* Got the problematic Kiwi to run using a v1.359 SD card copy of another KiWi. * Changed the KiWi IP address to a static IPv4 and confirmed ARP rule setup in router. * Rebooted but still got assigned a DHCP address. * Kiwi admin …
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Hi Stu, I've waited for >two hours :-( I got it running again with a v1.359 SD card copy of the other KiWi after previously loading a v1.309 with the WiFi configs (Loading v1.359 didn't work when I'd previously used the v1.286 backups to try an…
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Update. I made an up to date backup of one of my other KiWis which is at v1.359. Unplugged that KiWi and plugged in the problematic one. Plugged in the SD card and it seemed to load, but then I just get sequences of bright and dim (I had set the …
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Hi Cathal & John, Thanks for that, it's just reminded me that I think this KiWi was the one I tried to (unsuccessfully) add a WiFi adaptor to some time ago. So it's probably messed up the eth0 interface settings. I'll try reverting to a backu…
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Hi Stu, That's what I ended up doing too. Probably a good idea to have a proper clean out anyway :-) My thanks to Rob for the updates. Regards, Martin - G8JNJ
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I also find the default too bright and being able to set an offset to the auto scale value would be useful. I'm also still using /?sqrt=2 value added to the url, as the option is not available in the colour map dropdown. Regards, Martin - G8JNJ
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Hi Rob, That's the address I included you on as a cc - I've just resent it please check spam etc. Regards, Martin - G8JNJ
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Hi All, Anyone else been contacted by Corrie - M0XDK - WSPRNet Admin, regarding optimising uploads ? Edit -Rob I have copied you in on an email regarding this. Regards, Martin - G8JNJ
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Hi, I note that you are using Chrome. I've had some serious problems when using Chrome, with some web pages (not just KiWi's) not being correctly updated when I've tried to refresh the browser. On one occasion it continued to not update a page pro…