G8JNJ
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Ha, Ignore my last posting. It just took a bit longer than expected to sort itself out after having lost lock, and it's now working again. Pressing the 'Post comment' button must have fixed it :-) Regards, Martin - G8JNJ
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> >I moved one of my KiWi's to a new site and initially everything was working OK. >http://kiwi.farnham-sdr.com:8073/ >However I now find that GPS reception has become erratic. >The antenna seems to be OK (edit maybe not after all, as…
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I should have added. I think the term AGC threshold may be misleading. I'd expect that if you reduced the AGC threshold level down to say -130dB, it would be operating all the time, but actually the opposite seems true, as you increase the threshol…
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> >I'm curious why you chose the RPA-1 preamp instead of the LZ1AQ for this antenna? > Hi Ron, The RPA-1 has a 50 Ohm input impedance, so it was easier to match to 450 Ohms, plus the IMD performance is better. Unlike small diameter loops…
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Added as a cross reference. Notes related to Loop on Ground antenna running in another thread. http://forum.kiwisdr.com/discussion/comment/9446/#Comment_9446
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Hi All, Details of my 'Loop on the ground' (or technically just above it) can be found on this webpage. https://www.g8jnj.net/loop-on-the-ground Treat the page as a preview as it's more of a working notebook and not really fit for publication yet…
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Hi Ulli, An amateur radio friend of mine was with the British Antarctic survey many years ago, and was on the ice for a while. I think the reason they use terminating wires on the V beams in Antarctica is that the ice & snow surface is more l…
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Hi Daryl, I successfully use an old iPad Mini. What browser are you using ? Have you checked it's security settings ? Have you tried a different one ? Regards, Martin - G8JNJ
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Hi Phil, > >MASK_ing the RF spectrum during the sampling phase , hence directly at the RF stage instead of post sampling procedures > Unfortunately you can't do that. All the processing is performed after the Analogue RF signals are sam…
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You can already specify it in the URL with the pwd= or password= parameter to prevent a timeout, you can also specify a protected channel to use. From the quick start guide http://kiwisdr.com/quickstart/index.html#id-user-urlp-prot. Some Kiwis ha…
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Hi Ulli, You commented that "What I question is the strong increase of gain towards higher frequencies... up to +7dbi on 10m " Yes that seems sensible to me. As the wire becomes progressively 'longer' in terms of wavelength, the radiat…
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Hi John, I've encountered another similar but rather obscure problem that may be related. I recently moved one of my KiWi's to a site that is shared with another websdr. I initially setup the KiWi to use the existing site domain name http://farnh…
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Hi Ulli, The TCI 530 is sold as an antenna that is, quote:- "designed specifically to support skywave communications at short (0500 km) ranges. The 530 directs energy overhead to provide optimal support for shortrange circuits." Howeve…
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I've used the GPIO ports for the antenna switch without any problems. However think I remember adding a cron job to mine to default to a particular configuration after a pre-set period, so I've never had a similar problem. I'd try un-installing th…
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Hi Chris. Could something like this also be used to sort multiple NDB's using the same nominal carrier frequency, but using slightly different modulation frequencies ? Regards, Martin - G8JNJ
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All India Radio 15030KHz heard in UK at 13:14 IF Level: -10.9 dB SNR: 6.7 dB DRM mode B Chan 10kHz ILV L SDC 16 MSC 64 QAM Protect: A=0 B=1 Services: A=2 D=0 Medium range use, multipath resistant Services: 1 AAC (1) CHINESE EEP Audio 10.48 kbps 2…
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Another new one I think at 17:43 UTC on 6025KHz IF Level: -9.1 dB SNR: 16.2 dB DRM mode B Chan 10kHz ILV L SDC 16 QAM MSC 64 Medium range use, multipath resistant Services: 1. AAC (1001) SNR Tiganesti E1 EEP Audio 20.96 kbps Diffusion expriment…
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> >2 nights in a row now I've been unable to pick up any of the signals which is odd. I check schedules and some of them I should be able to get. But waterfall is empty >in those places or covered by a legit analog signal. > You are doi…
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@Lonecrow > > I find signals I can't identify or decode even looking at the waterfall comparisons. > I think you are in the UK. Try taking a look at the tags on my main KiWi on the same frequency you can hear, I use them as my logbook a…
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This is the originating authors personal website. https://planesandstuff.wordpress.com/
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It's been there for quite a while :-) The performance is quite good and equals that of several free CW decoders that are available. As a test I fed my KiWi with some pre-recorded CW which I modulated and mixed in with different levels of backgrou…
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The issue was not associated with just the KiWi or cookies and I subsequently found that it affected other websites with audio enabled too. After a lot of messing around I discovered that the problem was associated with the settings in Windows 10 …
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I think it's probably just a transmitter problem. These days many broadcasters are running on a shoestring and don't have full time engineers on site, so problems like this can occur and they don't get noticed unless someone tells them. It's partic…
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I don't understand some of the outrage about this. Sure it's annoying and disappointing for some, but it's Andr?s's website and his decision, so I don't have a problem with it. There are other alternatives and some of these are actually better, bu…
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Yes there are a lot of Surface Wave Radars, especially in North America, but these tend to be much lower power and sweep over a much wider bandwidth. However even so I can hear many of the North American ones in the UK, typically around 4MHz when G…
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Hi Ron & Andy, Thanks for the suggestions. I'd already tried the obvious security settings, but they were OK and the problem persists. Maybe I'll just swap over to Firefox, as Chrome seems to be becoming increasing problematic to use, a bit …
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Hi Jim, I'm sure I've seen the side mounted eggbeater in a US Navy antenna catalogue, but I've not been able to find it again. However I did find this inverted cone RX antenna as fitted to a Kingston Class Canadian Navy coastal defence vessel, but…
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There's still http://kiwisdr.com/public/ http://rx.linkfanel.net/ https://ve3sun.com/KiwiSDR/ Among others. But it's a pity the sdr.hu site that is linked from the KiWi GUi and other prime sites is no no longer open access, especially when all …
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Hi Jim, Ah OK it's not quite as I thought it would be, but it does look like it would do the job quite well. It would be interesting to know the actual feedpoint impedance, as I suspect it has some sort of matching transformer built into the base. …
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Modern electric fence energisers have 'pulse shaping' which minimises noise from the energiser itself, so most problems are associated with arcing or insulation breakdown. One quick test is to disconnect the energiser and measure the resistance bet…