benson
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For antenna work on HF indeed it would be really helpful to have a measure of SNR in a narrow band receiving channel, whereas on VHF and higher frequencies RSSI alone might be sufficient to check for improvements. Without knowing any specifics of t…
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Hi Glenn, Near-field or common mode ingress could have occurred although I am pretty sure the folks making the measurements were aware of this possibility and took utmost care to avoid that. However only 3 sites classified as quiet rural were used…
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Regarding current noise levels an interesting report describing measurements and methodology of man-made noise at 50 amateur radio locations in the Netherlands ranging from from rural to city environments can be found in the reference below. These …
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Also interesting is the Spectral noise reduction in the Teensy Convolution SDR software package...
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So in the end it is probably best to purchase from the bonafide distributors and stay away from these unknown and questionable web re-sellers. This assures a good quality product, some form of warranty or return and last but not least a payment of r…
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An article in 'Janes Intelligence Review' last year certainly points in that direction. A snippet of that article can be found in the link below. Written by one of Jane's editors it might carry some weight. link: https://www.janes.com/images/ass…
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One of those less well known but excellent alternatives is directKiwi created by llinkz. (https://github.com/llinkz/directKiwi) The program allows you to select any of the available Kiwi receivers on a map interface GUI and get the streaming audio …
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Previously when Marco, IS0KYB still had his "dynamic SNR" website running he had another metric called SibaQ. Although not disclosed it seemed to also factor in the 24 hour variation in SNR's for the 4 bands he measured hourly. Sorting K…
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It turned out that following the steps posted in dropbox is all that is needed, however when creating a crontab as root I had to remove root as user on all the lines to get the cron job running on my RP3. Viewing the results on PSK reporter is quit…
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@la3rk Olaf any further progress on your Kiwi API modification that allows frequency change with audio running ? bregards, Ben
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Tried to install the FT8 v2.0 decoder on a RP3 and the ft.sh scripts runs well with decodes shown. Originally Andy installed this in root on a Kiwi SDR and so I tried that as well. Trouble is I can not get the crontab running which is a crucial par…
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Makes easy work of transferring and plotting in spreadsheets. Thanks,Ben
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Hi John, Just in case you're going to look at adding averaging to the streaming data, could you also see if timestamps can be added to those S-meter readings. Best regards, Ben.
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(Image) Ah, I see that's what you're really after, Martin.... The SKA, LWA, LOFAR radio astronomy arrays have produced a lot of interesting designs which were created with as one object noise temperatures below the galactic background noise when u…
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GMF-11F Ukraine wefax no joy. I used directkiwi (https://github.com/llinkz/directKiwi) to look for possible transmissions today. This very useful Python program created by linkz seems actually not so well known among Kiwi users. By using the audio…
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Since you are familiar with Linux you could have a look at "selcald" which is an Arinc-714A decoder. ref 1: https://github.com/westphae/selcald ref 2: https://bitbucket.org/techn0mad/selcald/src/master/ best regards, Ben
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That won't work for you, this link does: http://swloi33.proxy.kiwisdr.com:8073/?f=13825.00iqz7
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Here is one from mainland China currently on the air: http://192.168.1.8:8073/?f=13825.00iqz7
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Once you connect to a certain Kiwi receiver in the geographical area of interest you can try search for any DRM marked labels via "Shift + @". The owner may have already marked frequently active DRM stations. See http://forum.kiwisdr.com/d…
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Hi Zachliang, A couple of years ago PA3FWM wrote a short article about Loran C operation (see ref 1). If you are still in reception range of an operating Loran-C chain either directly or via a remote Kiwi it shows you how to estimate your receiver'…
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Hi John, Any chance adding a 'streaming' version of this printing time and averaged S-meter reading to a file ? Best regards, Ben
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Thanks Powernumpty for your suggestions. After connecting directly using an Ethernet cable between the Kiwi and a laptop the problem was still there. Then upon closer inspection I noticed that in the additional html section of the admin web page I…
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WA2ZKD wrote: seems like an extension for tracking one chirp TX could be possible (?) I recently used some auxiliary programs to tune KiwiSDR (via Catsync) and tracking certain chirp sounders to see if propagation is open in parts of the HF spectru…
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@ANgazu. Thank you for pointing out Link 11 clew. Seems a bit strange though coming from Shanghai PLA navy docks. Best regards,Ben
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Over at Techzone ( https://goughlui.com/2019/01/13/radio-radiofax-hf-fax-reception-on-kiwisdr-with-kiwifax-py/ ) there is series of blog posts with a lot of current info about HF fax reception in general , active frequencies and slant corrections.…
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Hi Christoph, Happy to report that gr-kiwisdr is also running fine in a virtual environment. I am running Oracle VM virtualbox on a windows machine and then installed GNU radio on a Ubuntu 18.04.2 Linux platform. Several tries were needed finding o…
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If your friend can have access to the roof of the building there might be better options. I had a similar situation in Taipei and managed to install an active antenna on the roof outside the view of the security cameras..hi. Got some good results w…
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Now that many more Kiwis are updated to V1.246 I do see quite a few more station that can be used for TDoA and some at good locations for multilateration. Locally I noticed much improved position accuracies and about 95 pct of time all tracked GPS s…
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Hi John, Indeed in the log are error messages about the time zone and I understand that way one can not expect local time: Tue Dec 4 19:28:33 15:10:56.008 0... TIMEZONE: lat/lon from sdr.hu config: (my latlon) Tue Dec 4 19:29:13 15:11:36.7…
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(Image) Hi Ron, A screenshot below. My laptop time is at UTC as shown in RH bottom corner. With the direct Ethernet connection the UTC time on the Kiwi browser time is nowhere near. When connecting the Kiwi via a (wireless) router to the interne…