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G8JNJ

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G8JNJ
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  • Hi Mauritz, All good. BTW if you have back to back input protection diodes connected across the amplifier input (as I show in the diagram) you may find they add to your IMD. I've had to connect them in series across the supply rail so that they are …
  • Hi Mauritz, Ah OK I see what you are doing, I had wondered about the increase in noise around 30MHz - I do the same but I was keeping it to myself as my secret weapon :-)   What's the GP antenna - that's really good on the NDB band. Keep up the good…
  • Hi Mauritz, I just had a play with your SDR and its's very good - looks like I now have some serious competition :-) Just as a matter of interest, what size whip are you using with the active antenna ? It's working quite well but I'm a bit surprised…
  • Hi All, Something like this next suggestion has been discussed before https://github.com/jks-prv/Beagle_SDR_GPS/issues/28 But here is a new variation on my previous thoughts. Please note that this would require some backend / web work as well as ad…
  • Hi, Not being fluent in Linux commands, I use WinSCP https://winscp.net/eng/download.php to move stuff around to and from my windows machine and keep backups of my customised files etc.  It's also possible to open and edit files still residing on th…
  • Hi, I think that's easy to fix. Just get the Admin to set the SDR security password protection to a suitable number of private receivers  (0-4) as required. The timeout can also be disabled so that the SDR browser session keeps running when being us…
  • Hi, Mauritz - if you look at the LZ1AQ control interface shown on page 13 of this document http://active-antenna.eu/tech-docs/2_ActiveAA_Mount_21.pdf You will see that the required control signals are even simpler than you may think at first glace.…
  • Hi Mauritz, I wouldn't bother editing the code. The solution is quite simple. Build a normal transistor interface for each of the eight GPIO pins. Then use a matrix of diodes to form a simple logic routing system. This is how I have done it:-  GPIO …
  • Hi Dave, Thanks for the links - unfortunately I had seen those pages previously. The answer is hidden somewhere among all the ITU RR documents. Try searching for  "1606.5 kHz (1605 kHz Region 2) and 4000 kHz" "GE85-MM-R1"  " RR Appendix 17 and Appen…
  • Hi Dave, I think the 6MHz Pirates tend to use LSB so that the legitimate commercial / military stations (who often only have USB) can't easily tell what they are saying. Russian CB'ers a mainly using AM from very old / surplus ex military equipment,…
  • Hi Dave, They are French pseudo CB'ers /  'Freebanders' / Echo Charlie operators. There are unlicensed operators from loads of different countries using that segment of the spectrum. 6660.00KHz LSB is typically used as a calling channel. Other frequ…
  • Hi Dave, It's a NATO Link-11 data transmission. See  http://valentfx.com/vanilla/discussion/639/signal-at-11016-5-khz Regards, Martin - G8JNJ
  • Hi All, Sorry folks but I still use the SND button and generally leave it on white when using the SDR on a local connection, as I find the remaining mild amount of audio stuttering when zooming etc. to be more annoying than any improvement in audio …
  • Hi Rich, I don't think you will have zapped the Ethernet port, they are quite robust. Sometimes I find I have to wait a while for the Ethernet port to spring into life after a power cycle - maybe 5 mins or even longer if I have reloaded the software…
  • Hi Emmanuel, I understand the points you are making, but to be honest there are some KiWi's that are practically unusable due to the low level of wanted signals and high levels of interference. The current vote based rating system on sdr.hu does n…
  • Hi, I think the model that was setup by sites using PA3FWM's web sdr software that lets a lot of concurrent listeners using the same sdr (lots of users on few expensive to setup and run sdr's) is different to the KiWi sdr distributed model (lots of …
  • Hi Peter, Whilst re-reading the KiWi quick guide, I came across a reference to the priyom 'pavlova' dispatcher. https://github.com/priyom/pavlova "This provides live probing of available receivers and is performed in client-side javascript in your …
  • Hi Peter, My misunderstanding - I thought that all of the IBP sites were constantly transmitting and cycling through the beacon frequencies. I now realise that they don't transmit all of the time and have a substantial 'off' period until it's their …
  • Hi Peter, Ah OK, I thought it would go to the frequency the chosen beacon was currently operating on rather than waiting, but I understand better now - looks really good :-) Regards, Martin - G8JNJ
  • Hi Dietmar, That looks very good. The big test is to see if the antenna you are using is good enough for the KiWi :-) The ITU publish a noise / frequency curve (Rec. ITU-R P.372-8) https://www.itu.int/dms_pubrec/itu-r/rec/p/R-REC-P.372-8-200304-S!!P…
  • Hi Peter,  I just tried the extension in v1.123. Unfortunately it doesn't seem to work for me on my iPad Mini running Chrome as the extension pop out box on the left hand side of the screen (where all the other extension pop out boxes normally are s…
  • Hi Peter, I really like the website and map :-) Some suggestions as requested. Can the mode and zoom level be selected from separate drop down lists with suitable default values, so that in most cases only the frequency needs to be entered each time…
  • Hi John, Great thanks for doing this - equilibrium is restored and all is now at peace in the universe - if only :-) Regards, Martin - G8JNJ
  • Hi John, Prompted by my competitive streak, I have now modified my RF distribution amplifier so that it works properly down to 10KHz (and lower). If I select the 'Trask' active antenna option, I can now hear the Russian 'Alpha' navigation system 'pi…
  • Maybe each KiWi should perform its own measurement based on this method ? This could be collected and averaged over a period by sites such as sdr.hu. It would also be a useful 'real time' statistic for KiWi admins allowing them to optimise the rec…
  • I like the S/N scoring :-) However today's solar activity will really mess it up :-( What period are you averaging over and are they all sampled at the same LOCAL time on each SDR to compensate for day night variation in propagation ? Regards, M…
  • Hi, >Don't worry, Martin, the current crude score samples rank your receiver 13th out of 134 rated receivers That's what alerted me to the problem, I had been watching my score gradually climb over the past six months to about 400 votes, until I …
  • OK all interesting stuff and very thought provoking....... MY SDR will also be skewed by the fact that I notch out the strong broadcast bands in order to be able to run the rest of the frequencies at a higher level. Hmmm..... thinking about it you …
  • Hi All, I see that in V1.121, John has added an updated set of Icons to sdr.hu indicating GPS lock, receiver performance and VLF coverage (and perhaps more). I think this is a step in the right direction, but I'm not sure how these are derived or wh…
  • Hi All, Thinking about his a bit further, I don't believe that using WSPR in its present form (requiring some form of initiation on each WEB SDR, rather than it running as a background task) will work particularly well. However I've noticed that gen…