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G8JNJ

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G8JNJ
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  • Vote rigging on sdr.hu

    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 'pips' on 11.9KHz.

    So, if I ask really, really, nicely can I please now have a VLF sticker for my SDR :-)

    Regards,

    Martin


    KA7U
  • Suggestion - ability to embed extension switch in dx,jason tags

    Hi John,

    Would it be possible to embed the URL parameter extension switches in dx,jason tags ?

    For example if if a tag is clicked on it would open up the appropriate extension.

    e.g. 100KHz Loran, WSPR frequencies, Fax frequencies or some other extension which is applicable to the tag.

    Regards,

    Martin - G8JNJ


    WA2ZKD
  • Ionospheric Heaters?

    Hi Ron,

    As far as I'm aware DARN is only occasionally used these days when they can afford to put some money in the electricity meter.

    However there are a whole host of other atmospheric sounders and radars that can be heard almost continuously.

    Here is a quick guide to some of the more obvious ones.


    Regards,

    Martin - G8JNJ
    KA7U
  • Less than optimum SDR's online.

    Hi,

    I also have this frustration. 

    I've tried to assist where I can by sending personal emails to admins where I think I can help improve things. 

    But unfortunately in some cases the Admins are more software orientated than having any real interest in the hardware or RF side of things. So it's very difficult to try to get them to improve things when either they aren't really that interested. Sometimes this is because they don't really know what sort of performance to expect, or alternatively they don't have a good enough understanding of RF to be able to understand the nature of the problem and how to go about fixing it. Just stuffing a random length of wire in to the KiWi antenna socket and hoping for the best shouldn't be the default position.

    I have offered to make up filters and send them free of charge to some  Admins (where I thought the SDR was otherwise OK apart from some local overloading or interference that could be filtered out), but so far there has not been any take up (I don't to make a wide announcement and then spend all my time sending free stuff where it's not going to make any difference).

    Maybe we could collectively write up some more detailed guidance notes for SDR Admins or folks considering buying a KiWi (as I notice that Farnell / Newark are now stocking the boards and kits) who are not well versed in the RF dark arts ?

    Regards,

    Martin - G8JNJ


    M0TAZ
  • possible feature : TUNING lock

    I think Phil's suggestion of a last used frequency memory would be useful.

    I often find that I listen to one frequency whilst scrolling up or down the adjacent spectrum. If I quickly tune to a new frequency to hear what's been transmitted, it would be good to be able to quickly go back to the previous frequency without having to scroll back or retype the frequency (which I've often forgotten anyway).

    Would it be possible to add something like a browser 'back' and 'forward' function below the frequency entry box, which would allow you to scroll between frequencies that have been entered during the current browser session whilst using the SDR ?

    Regards,

    Martin - G8JNJ



     
    WA2ZKDic8pof
  • possible feature : TUNING lock

    I think Phil's suggestion of a last used frequency memory would be useful.

    I often find that I listen to one frequency whilst scrolling up or down the adjacent spectrum. If I quickly tune to a new frequency to hear what's been transmitted, it would be good to be able to quickly go back to the previous frequency without having to scroll back or retype the frequency (which I've often forgotten anyway).

    Would it be possible to add something like a browser 'back' and 'forward' function below the frequency entry box, which would allow you to scroll between frequencies that have been entered during the current browser session whilst using the SDR ?

    Regards,

    Martin - G8JNJ



     
    WA2ZKDic8pof
  • How do you use your SDR

    Hi All,

    Mine is fully public 99% of the time.

    I don't think the bandwidth used is excessive, but I'm on a VDSL service with no user cap (as far as I'm aware).

    However it does get very high usage and sometime I have to kick users off so that I can log in and use it myself.

    I have a particular problem in that a lot of Dutch music pirates use my SDR all day long to monitor their own transmissions around 6MHz. 

    What I really need to be able to do is to be able lock out certain frequency ranges or restrict the amount of time individual users can stay on the SDR before getting automatically kicked off. I currently have the inactivity time out set at 15mins but I may have to reduce this still further.

    I now have a second Kiwi on order, so it would be good if I could link them in some way so that they both appear as one Kiwi but with eight possible connections.

    I previously raised this suggestion in this link https://github.com/jks-prv/Beagle_SDR_GPS/issues/48

    I know that there is at least one other station running multiple Kiwis on different ports so I don't think I'm the only Admin who may be interested in this idea.

    Most of the time (when I can log in) I use my Kiwi for general short wave listening and enjoy spotting 'unusual' activity on the waterfall. I also enjoy listening to NDB's, BC stations and Amateur stations. Quite a few of my users seem to listen to HF Aero traffic as well.

    I note that quite a few folks use the WSPR extension (logged as SWUKSDR) especially on the 472KHz band. I've also got antenna switching and this gets used some of the time mainly by the BC listeners in order to try and reduce interference or other stations that are co-channel.

    I think the KiWi has been an excellent purchase and It's certainly re-awakened my interest in Short Wave Listening.

    Well done John, and thanks for all the ongoing support and rapid resolution of any problems that may occasionally arise :-)

    Regards,

    Martin - G8JNJ



    KA7UTonda
  • How do you use your SDR

    Hi All,

    Mine is fully public 99% of the time.

    I don't think the bandwidth used is excessive, but I'm on a VDSL service with no user cap (as far as I'm aware).

    However it does get very high usage and sometime I have to kick users off so that I can log in and use it myself.

    I have a particular problem in that a lot of Dutch music pirates use my SDR all day long to monitor their own transmissions around 6MHz. 

    What I really need to be able to do is to be able lock out certain frequency ranges or restrict the amount of time individual users can stay on the SDR before getting automatically kicked off. I currently have the inactivity time out set at 15mins but I may have to reduce this still further.

    I now have a second Kiwi on order, so it would be good if I could link them in some way so that they both appear as one Kiwi but with eight possible connections.

    I previously raised this suggestion in this link https://github.com/jks-prv/Beagle_SDR_GPS/issues/48

    I know that there is at least one other station running multiple Kiwis on different ports so I don't think I'm the only Admin who may be interested in this idea.

    Most of the time (when I can log in) I use my Kiwi for general short wave listening and enjoy spotting 'unusual' activity on the waterfall. I also enjoy listening to NDB's, BC stations and Amateur stations. Quite a few of my users seem to listen to HF Aero traffic as well.

    I note that quite a few folks use the WSPR extension (logged as SWUKSDR) especially on the 472KHz band. I've also got antenna switching and this gets used some of the time mainly by the BC listeners in order to try and reduce interference or other stations that are co-channel.

    I think the KiWi has been an excellent purchase and It's certainly re-awakened my interest in Short Wave Listening.

    Well done John, and thanks for all the ongoing support and rapid resolution of any problems that may occasionally arise :-)

    Regards,

    Martin - G8JNJ



    KA7UTonda
  • internet lag and decoding JT65

    On my local connection I'd estimate that the KiWi lag is only about 200-500mS maximum. 

    Just about a long enough a delay to cause you to hesitate whilst speaking if you are monitoring your own transmission.

    Over the internet the delay can be much longer, one user has reported a delay of around 2 seconds. 

    I think a lot depends upon variables in the users ISP and network routing, all of which are outside the Admins control.

    Regards,

    Martin - G8JNJ




    Serge
  • AM Overload Solved

    Hi James,

    Your notches are doing a great job, as your SDR seems to be a lot happier now :-)

    Regards,

    Martin - G8JNJ
    WA2ZKD