G3ZIL
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John I appreciate you have had many matters to attend to. Any insights into these measurements would be helpful ahead of the HamSci Workshop in March. thanks Gwyn G3ZIL
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Difference between raw and corrected number is that the -0.013 Hz OCXO error at 10 MHz has been corrected for. Expected error from: https://forum.kiwisdr.com/uploads/131/6ID21BWUSIB3.jpg all frequencies in Hz Gwyn
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Thank you, John, for this adding this useful metadata I've made a series of measurements as set out in the Table below with the Notes below the Table outlining the setup. The two rows in green are for the external clock frequencies for the old and n…
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A short test spanning 19 local WSPR spots shows that 66.66 MHz does indeed provide the absolute baseband frequency accuracy that is valuable to us. The differences between the Bodnar KiwiSDR at 66.66 MHz and two KiwiSDRs with their own GPS aiding wa…
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I will leave it to Rob to comment on the use of kiwirecorder.py in wsprdaemon. I do think you have found the source of the problem, the fixed DDC decimation at 5555 (505*11). Thank you, John, for the calculation to suggest 66.66 MHz, and thank you,…
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Yes, the is exactly the reason, seeking as clean a clock signal as possible to minimize specctral spreading for use with FST4W reception.
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John Thanks for trying to fix, unfortunately it has not rectified the problem. I have updated to v1.558 Config: v1.558, 8 SDR channels, 12 GPS channels | Uptime: 0:11:13 | UTC: 14:56 | Local: 15:56 Europe/London (BST) These are the mean freq…
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Thank you, John The fix in v1.557 has worked. Over two hours the frequency difference between two updated KiwiSDRs showed an average of 0.09 Hz and an rms difference of 0.14 Hz from 333 measurements.
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Jim, Just so happens that, with Glenn N6GN, I am looking into this while evaluating FST4W on the HF bands. N6GN/K, Glenn's remote KiwiSDR, is connected to a GPSDO and has line of sight path to WWV - it's an ideal test setup. Using kiwirecorder, or t…
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Jim, Thank you. I'll write a query to extract and send you in a private email. Gwyn
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Here's an S-meter view of SAQ 24 Oct 2021 transmission at G3ZIL IO90hw using an N6GN active short dipole vertically oriented, centre at 6 m. It starts with no signal, short period of continuous transmission then CW. Bandwidth was 60 Hz. I've a recor…
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Thanks, Stu, I can see you've stopped posting to 'noise' - no not the last - two to go! best wishes Gwyn
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Stu You are one of three wsprdaemon users that are still posting noise values to the wsprdaemon.org TimescaleDB table 'noise'. Release 2.9 posts to the new table 'wsprdaemon_noise' to which Rob now logs the ov overload count. We need to recover som…
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Stu "The Mix of 'text' "text" and text fields is also an acquired skill obviously" ... I think the problem is that Grafana's Query Builder does not isolate you from the syntax needs of the database being queried - in this case po…
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Hi Stu Mm. Grafana seems slow, and that may explain why you have to ask the question ... There's no 'club' of rx_id, currently it has over 4000 of them from reporters to wsprnet.org over the last three weeks. It should present you with a list when y…
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Hi Stu, You are an early 'beta tester' with the Guide, please do let me know of any other quirks. Section 3 on the use of pull-down menu options gave me most difficulty, and I'm keen to know if what I've captured works for all - SQL is not my forte.…
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Hello Powernumpty My error I'm afraid - if you've downloaded the Guide from the wsprdaemon website. Drop the http:// from the Host url and try again. 73 Gwyn G3ZIL
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Ulli ... I should start by saying that the hard work with Influx and Grafana was done by Rob, AI6VN, and especially his friend Tommy - I just wrote the user guide. Yes, the Grafana tool is very near real time, and has been solid since about May 201…
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Ulli ... I see you are posting your noise data to the wsprdaemon Influx database. So you can easily explore using the Grafana web tool, here are your recent 40m data for example: https://grafana.int8.com/d/3dcOdAmWk/calibrated-noise-dashboard?orgId…
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Clint, You've raised an important issue that we should look at. Those fixed scales have been there from the very early work Rob and I did on graphing the data, from before Rob added the option for band-by-band calibration. The simplest response wou…
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A CW carrier should result in a higher reading on the 'RMS' trace if it really was continuous, in that there would be no gaps in time for the algorithm to find the real noise level. But the FFT trace should continue to read the noise - because it fi…
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I'm right there with Glenn as regards measuring noise - hence the graph I shared. But of course, there are times when the spectrum is a useful, quick look. So just taken the attached screenshot. Note that this is with a USB WiFi dongle and not Ether…
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Jim, Using python3 kiwirecorder.py -s 10.0.1.71 -p 8073 -f **** m iq -L -5000 -H 5000 --s-meter 100 and a bash script that sweeps **** from 10kHz to 30MHz and subtracting 40dB to get to noise level in dBm in 1Hz results in the graphs below for two K…
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Ulli I have used a KiwiSDR in a backpack with an active monopole vertical and a slightly different processing path to wsprdaemon to measure and plot local noise. I've attached an example graph to show how one source of local noise (on 40m) decays w…
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Hello Ulli Thank you for your nice comment on our detailed paper on ResearchGate, and for the sources of the two figures. Glenn and Rob have answered your questions - they have worked on those aspects and so are the best sources. 73 Gwyn G3ZIL
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Hello Ulli Thank you for posting the 60m noise graph before and during the thunderstrorms, and for the map - the line north/south over France was immediately to the south of my own QTH here in Southampton, UK. I worked with Rob, AI6VN, on the noi…
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To answer my own question. The status page GPS position is fixed by design, picking it up, apparently, from the position set on the admin page sdr.hu for security reasons.
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I'm trying to use curl for the status page to get position for when "backpack mobile" tracing down local noise sources. But, while all other GPS lines update, the position remains fixed and does not correspond to the position on the admin …
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Version 3.3 of my report with N6GN and AI6VN showed that the after .wav files from the KiwiSDR were decoded using AI6VN's kiwiwspr.sh script there were occasions when the SNR of the weaker of two closely adjacent signals was Topped-up leading to a…