G4DYA
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Pactor - no FOSS decoder AFAIK, but specification is open: https://www.p4dragon.com/downloads.html (under Documents). FreeDV - little activity outside activity periods, but there seems to be quite a lot of interest. A UK-based group of FreeDV users …
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I've just done some tests with a KiwiSDR 1 and an external signal generator (Marconi 2019A). At 1 MHz and -73dBm into the RX, the S-meter displays -70.5 dBm in the 4 and 8 RX modes but -79.2 dBm in the 3 RX mode. So there appears to be an 8.7 dB dif…
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Not sure if it will help, but I use a local HTML file which embeds four kiwi windows in iframes: https://forum.kiwisdr.com/uploads/671/C2T6U658EHT9.txt Edit the URLs as desired and change the filename extension to .html and open it with a browser.
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I'm seeing the same problem with v1.467. One user is OK, but when a second user arrives RX0 sees a black WF and audio muting for several seconds at a time. Seen this on two Kiwis here. 4WF config.
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Am I missing something here? If "Spec AF" is pre-demod, what is the point of it? What does it show that "Spec RF" doesn't already show, suitably zoomed? Regards, Richard G4DYA
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Yes, with NBFM and the squelch set to just 1 it mutes even with S5 noise. Hadn't noticed it before.
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@jks Yes I rebuilt about an hour or so before I posted those results. @G8JNJ At the higher audio frequencies the modulation index is <1 so the higher-order sidebands will be quite small. You can see how small on the Kiwi spectrum/waterfall. (IIRR…
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My earlier comment about triangular noise isn't borne out by my test on another FM demodulator without de-emphasis, which shows a flat (white) noise spectrum. I don't understand this and need to dig further. On the latest kiwi (v1.577 just rebuilt) …
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With a flat frequency response (i.e. no de-emphasis), IIRR white noise into an FM demodulator should show a triangular distribution on the output, i.e. output rising with frequency by 6dB per octave. Among other things, I use Kiwis in the FM mode to…
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FWIW over the last few days there has been an 'intruder' on 7193 kHz - FSK with 250 Hz shift.
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IMHO wavelength designations of bands are old-fashioned, confusing and even ambiguous. For example the 18 MHz amateur band is known as 17m. Does 75m refer to the 3950-4000 kHz R1 broadcast band or the 3500-4000 kHz R2 amateur band? Does 60m refer to…
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Yes, should do. Pipewire is free software so can be built for any architecture or OS.
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As an aside, if you run Linux you can now use Pipewire instead of Pulseaudio and Jack. To clarify: ALSA is essentially the hardware drivers and is part of the kernel (plus a few utilities). Pulseaudio is a consumer audio server which is OK for doing…
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An FT240-31 core is not suitable. Fair-Rite #31 material is a lossy ferrite material designed to provide resistive choking. The suggested T50-2 toroid uses Micrometals #2 material which is powdered iron, not ferrite. To get 75 turns without overlapp…
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There was a discussion on this about three years ago: https://forum.kiwisdr.com/index.php?p=/discussion/1694/need-to-attenuate-lw-252-khz
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I'm seriously impressed by what you have done here John. Very nice intuitive UI design. And it works flawlessly. Thank you.
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Yes it's now fixed for me too. Thank you.
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Done. Thank you.
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Thanks for this Marco. In case others want to run it on Ubuntu 20.04 LTS, I had to install one python package and upgrade another: $ python3 -m pip install sounddevice $ python3 -m pip install pygame --upgrade
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I tried to boot from two SD cards without success before holding down the user button while powering up. The stale entry in /var/lib/connman didn't cause a problem. The code to invoke connman will need to execute two commands, one to set the ip addr…
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Observations so far: It only boots from the micro-SD card if you hold down the user button on the BBG while re-powering. (It's worth re-reading the quick-start guide that came with the hardware for info on this.) It's also necessary to backup and r…
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"DC is impossible to receive and I'll venture that none of us can go below 10 KHz" Just for sh*ts and giggles I tuned one of my Kiwis to 0 kHz USB and plugged a dynamic microphone into the antenna socket. I can confirm that the Kiwi is the…
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AX.25 networking code is built into the Linux kernel. It's 26 years since I last used it!
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Just tried opening two sessions on one Kiwi. Just opening the ALE extension in one session will drop the waterfall refresh rate in both sessions from 23 to 11 fps. Opening the extension in both will freeze both waterfalls.
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A good solution is to talk to the farmer. If his fence is arcing to ground it may not do its job properly and livestock will go where they shouldn't. With the right approach he could see you as a useful ally who will give him early warning of a faul…
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And there it is, implemented in the latest version, after just three days. Thank you very much indeed John. Richard
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I've done some measurements on the frequency response of the Kiwi below 1 MHz. Using a -53 dBm tone (S9+20) from a calibrated signal generator, I got -53 dB on the S meter down to 50 kHz. It rolled off below that: 20 kHz: -1 dB 10 kHz: -3 dB 5 kHz: …
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Wow. That's brilliant. Thank you very much indeed John.
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Thanks, but I'm aware of how to change the passband. I was just suggesting that the *default* may be sub-optimal, and could be raised a little. IIRR the wide-AM default bandwidth was tweaked to 9.8 kHz following a request in this forum. It isn't a …
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Resurrecting this old thread rather than starting a new one . . . Could the default be increased a little from 300-2700 Hz? It seems a bit narrow by today's standards. I often find myself dragging the bandwidth to 150-3000 Hz, but I think that would…