G8JNJ
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Military STANAG 4285 most likely from Australia Regards, Martin
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Unfortunately I've had the same sort of experience's Best to link to some external chat service, or not bother. I have turned off the name / callsign login for similar reasons. It seems to be like a form of graffiti, and once "tagged" more…
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You will have difficulty decoding anything from that signal, it is US Navy, 850Hz shift 50bd KW-46 Encrypted, Lualualei, Hawaii. Try using some of the KiWi's preset stations in the FSK extension, to get a better "feel" for the different sh…
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Hi Henrik, You can convey a lot in 16 characters with a concise choice of words, more if you abbreviate. I just used a short phrase and waited for a reply, then sent another short phrase asking a question. e.g. Admin - Martin Who is on 6290 ? TX Whe…
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Loots like a re-spin of their previous model, but with lots more diodes. https://forum.kiwisdr.com/uploads/264/9GMCYZF1RCI8.jpg I don't know why they have taken this route, maybe to increase the power handling, who knows ? Either way, it's a big ma…
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My V1 KiWi in its original clear plastic case did produce quite a lot of radiated noise and other signals, which could be problematic if you had other radio kit in proximity. Putting it in the metal case, or better still a die-cast box, with additio…
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Ah OK, sorry my misunderstanding. I have KiWi's and other receivers sharing the same antennas, so I'll see if I can find anything similar. Regards, Martin
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Which Airspy model is it, as the architectures vary sightly. From memory, the R2 uses a local oscillator and mixer with a 5MHz IF, but I'm not sure about the Mini. I also think there used to be block diagrams and technical descriptions of the Airspy…
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If you click on the column headers Internal / HF / External on the http://rx.linkfanel.net/ webpage, it will sort that column in descending order. Personally, I like to sort by the HF value, as that is often a better indicator of actual performance.…
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Hi Ken, The private IP address is the one used by the KiWi or server on your local network. It is either automatically allocated using DHCP, or is fixed in the device configuration file or router table. The public IP address is the one your router u…
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The port is defined in the actual device configuration file. Some port numbers are used for specific purposes, like 80 for web pages or 22 for SSH, others are chosen and sometimes become a defacto standard, but the can be changed if required. Imagin…
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Which KiWi is your own KiWi, where is it located, and is it public ? Thinking about this, as this forum only allows limited information to be included in our profiles, it would probably be a good idea for folks to include their KiWi URL(s) in releva…
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Yes, still plenty around. Which KiWi did you use to receive it ? Just some general information that may be of use to yourself or others reading this. Priyom is a good source of information regarding number stations, and has a dynamic list of daily s…
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Two or three times an actual MW broadcast frequency is often observed when very strong local transmitting stations are present. In this case 3 x 1278kHz = 3834kHz Sometimes these are actual harmonics being radiated by the transmitter, sometimes they…
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Hi Steve, OK, thanks for doing that test. I think it provides a bit more confidence that the KiWi isn't doing too badly. You could always drag out the KiWi receiver passband if you felt it was a bit too narrow. I guess the commercial decoders woul…
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Hi Steve, Interesting. I understand it was a quick test, but I don't think your comparison is a level playing field, as you are using a separate receiver, as the RF characteristics, AGC, RX bandwidth etc. may be different. Apples vs. Oranges. As a …
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You have to follow the propagation to get the best results at any particular time of day or night. That's the great advantage of being able to use a worldwide network of remote receivers. You can pick a KiWi to give you the best chance of hearing s…
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Try listening to Wessex at the moment (19:00 UTC), 40m is buzzing and there is plenty of CW activity. This is what the waterfall looks like, is yours similar ? https://forum.kiwisdr.com/uploads/178/N59A1RKGTMS4.png Regards, Martin
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All my KiWi's are behaving normally, but are you basing your observations on S-Meter readings, which have gone through some changes, or something else ? Just a thought, but it may be that somehow you have stored cookies that somehow set manual gain…
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IMHO, It's difficult enough getting suggestions implemented in OWR, without causing major upset. OWR+ less so, but it can still be problematic on occasions. Stick with the KiWi, and John's excellent support, unless you have an absolutely compelling …
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Hi Philippe, That looks like a switching supply to me, probably more than one. See if the bands of interference repeat at regular intervals, typically at harmonics of the actual switching frequency, 60, 100, 160kHz. Unfortunately, if carried by the…
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I use 75 ohm, foam filled, all copper satellite TV coax, with braid and foil for my active antennas. Low loss and effective screening, don't worry about the slight impedance mismatch to 50 ohms. Something like WF100 costs around £30 for 50m. Don't u…
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The antenna looks a bit boxed in and close to other properties (and noise sources) in that position. Have you tried it parallel to the fence line I have marked in yellow ? It doesn't need to be mounted high up, my loops at home are pretty much on th…
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They are most likely pirates, probably fishermen. They often like to find "private" frequencies in order to conduct their "private" conversations, and these tend to be on frequencies with number sequences that are easily remembe…
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For transmit purposes, it's all about antenna efficiency, and radiating as much of the applied RF power in the direction you want it to go. For reception purposes, it's all about the Signal to Noise Ratio, and a good transmit antenna may not always …
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As I said previously, the majority of Bias Tees have very poor filtering between the DC line and the RF path. Nearly all the circuits you find on the internet tend to be outlining theoretical designs, that concentrate on providing the least attenua…
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Check the antenna Bias Tee first. Many don't have enough filtering built into them. Regards, Martin
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Before swapping supplies, make sure that it is the Apple power brick that is causing the problem. It may well be something else. The signal will most likely change its characteristics if the power supply load is altered in some way. Try a different …
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"Seems the interface is a bit slicker." Not really, it's just different, and has as many "quirks and foibles" as the KiWi (sorry John). OpenWebRX + is more orientated to the VHF / UHF bands, and is good at the modes that can be f…
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There are so many amateur digital modes these days, it is often very difficult to say what is being used. It is around the frequencies typically being used for SSTV, and it could be Digital SSTV, but that is just a guess on my part. The Signal ID Wi…