G8JNJ
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Yes that's a lot better, for me anyway :-) Thanks John.
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Hi John, Some worthwhile additions in this release. A suggestion. The gaps when the distance and age are not present, tend to make my eyes zig zag down the text columns (but maybe that's just me). Would it be possible to add some guide rulers or alt…
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Building the hardware yourself doesn't really solve the problem long term. If you just want that, keep your eyes on the auction sites for second hand units. The main issue is on-going software support and keeping the servers running so that things l…
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One of the main problems the KiWi and clones are facing is global supply issues. This is not just confined to SDR's like the KiWis, lots of other products are also affected, as you will know if you have tried to obtain a Raspberry Pi in recent times…
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Maybe try flushing your browser cache ?
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Have you tried using the Custom Colourmap Extension to define your own?
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If it works OK on your local LAN, and other kit can be remotely accessed without any issues, then that rules out your network, switch and router. So it has to be something that your ISP has done recently, despite their denials, such as plant, hardwa…
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You have a lot of kit running. Is it possible that something is hogging a lot of bandwidth ? If it works on the local network, I suspect your ISP is doing something with your upstream traffic, maybe throttling it back for some reason. Usually becaus…
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Hi Don, It looks like some sort of networking issue. In situations like this I usually ask myself "what has changed ?" Some initial thoughts. Have you moved any cables or wiring ? Have you altered your network configuration or added any ne…
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Hi John, That sounds about right. I've been trying to make some A/B antenna tests using PSK reporter, and in comaparison to WSRNET it's almost impossible. Which is a pity as several runs of WSPR take ages, whereas FT8 should theoretically be much fa…
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https://forum.kiwisdr.com/index.php?p=/discussion/comment/15568#Comment_15568 Hi Glenn, Yes maybe, but I thought John was looking for inspiration to make the extension more visually 'interesting' :-) PSK Reporter is currently suffering quite badly f…
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Understood,. How easy would it be to plot the stations spotted on a map like that used in the HFDL extension ? Maybe different colours for different bands or S/N scores ? That would be another way to visualise real time reception and propagation, an…
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OK maybe I'll do some more experiments, to see if I can find a better compromise. To me the grey isn't that grey, but it seem to have a pink tinge to it, which is off as it seem to be present on several different screens. I don't know if this is du…
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Hi John, That would be really useful if you can get it to work, as it seem to be more useful than WSPR for some propagation monitoring, simply because there are so many people now using it. Maybe it could send spots to PSK reporter ? I'm not sure if…
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"If you look at the WINB 10 kHz wide transmitted signal, half of it is DRM (and when decoded shows the BW to be 5 kHz) and the other half is a non DRM data signal. The FCC filing showed that WINB adds a low level DRM signal with the non-DRM dat…
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I've now had a chance to listen to a mix of different NBFM off-air signals. To me the de-emphasised audio sound slightly muffled, but not excessively so. The UK CB band that uses NBFM radios specifically designed for the UK market, sound acceptable,…
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I think the issue with what Wayne is hearing, is down to the frequency at which the de-emphasis kicks in. John has implemented a true definition of 6dB per octave with the break point occurring at 400Hz. With that break point, and de-emphasis on, …
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Hi John, Thanks for that. Unfortunately I have discovered that the colour scheme I suggested for the Slow Dev and Peak hold traces don't work at all well on a small screen or tablet. It could be that the spectrum in Yellow and Peak hold in Cyan and…
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Hi Wayne, OK that's good and is what I'm seeing too. I have done a bit more research and the problem seems to be that there isn't really a specification for Narrow Band FM pre/de-emphasis, other than the curve should have a 6dB / Octave or 20dB/Deca…
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Hi Wayne, If you use SDR console, can you open out the spectrum analyser to up to 20KHz. I'd like to know if you see the NFM spectrum with a second band of stuff between 12 & 18kHz that t can be seen in one of my previous plots. Regards, Martin
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Hi Wayne, I can't figure out in SDR# how to adjust the filter bandwidth properly. Unless you have the filter audio box ticked in the audio control panel, you get full bandwidth audio regardless of the filter bandwidth setting in the radio control pa…
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I agree that he latency would probably be too high for HF Trading, but there has been some speculation that WINB has been using the lower half of its transmitted DRM spectrum for that purpose, and the Red Lion transmitter site is in a suitable locat…
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This has opened up a whole can of worms. Here are a selection of audio spectrum displays of various radios and software. I have tried to get the scales to match each other but there are a few exceptions that I have indicated in the red overlay on ea…
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Ah, so it's not just me. I also noticed that some stored nnfm presets bring up I/Q when the tag is clicked on and I had to go back and edit the tag to set the correct mode. I'd thought it was just finger trouble at my end. Regards, Martin
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It's possible that the Airspy is using the broadcast WBFM 50, 75 or 100us time constant de-emphasis curve that a lot of receivers seem to have incorrectly also used for NBFM. It's getting late here, but tomorrow I'll take a look at my Airspys and re…
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Hi Wayne, Is that background FM noise you are listening to, or an actual signal of reasonable strength ? To me the most recent graphs look like the background noise floor when using FM, and the slope is what I'd expect to see when de-emphasis is app…
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Maybe ? There are lots of variable at play here. However his main concern is that he thinks the KiWi is rolling off too fast, which maybe in comparison to other radios it is, but that's not to say that it's wrong. I do find that on some signals the …
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There does seem to be a genuine problem with Radio Kuwait. I have a good stable signal with 20dB reported S/N margin, but no decodes. It's always been very slightly off frequency too. I don't know why these stations are wasting their electricity b…
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Maybe... However I just tried copying Waynes plots, but mine look different, and more like I would expect them to. Waynes plots bother me because there isn't a steep roll-off where the filter bandwidth ends, it carries on way past 6kHz. However ther…
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Hi Wayne, You are correct, something doesn't look right with your traces. Let's rule out some things first, whilst I try and repeat your findings. How are you piping the audio from your browser to the Soundcard scope ? Are any audio enhancements run…