G8JNJ

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G8JNJ
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  • What is this huge signal?

    G8JNJG8JNJ
    Hi Ron,

    It's probably Super Darn. I normally see it around 12MHz but your screen grabs look very similar.




    Regards,

    Martin - G8JNJ
    KA7U

  • Demo of new user interface [now available in v1.154]

    G8JNJG8JNJ
    Hi John,

    The LMS "denoiser" and "autonotch" filters work quite well and are a very welcome addition, so thanks for that.

    However I can't open any of the three test sites on my iPad running Chrome. The URL resolves OK but I just get a blank white screen.

    A few other minor observations:-

    The purpose of the 'Slow Dev' button isn't obvious - I think it needs to be called something else

    I'd prefer the 'Slow Dev' waterfall to be white rather than a 'strange' green colour, so that it is a higher contrast display that can be more easily be seen outdoors.

    Should the 'rainbow' spectrum amplitude display bar also be in black and white when the 'Slow Dev' option is enabled.

    The mute button needs to be either on the main pane or the audio panel needs to open by default rather than the waterfall when the browser session opens.

    Why is it WFO rather than WF - what does the 'O' stand for ?

    Should the spectrum display button now be on the WFO pane ?

    If the spectrum display button is moved could a second mute button be added in it's place ?

    Should the green arrow URL button be aligned under the up and down arrow buttons ?

    I'd still prefer the S-Meter scale to be at the top of the control pane

    I still think that the new dBm reading needs to be differentiated from the rest of the S meter scale

    Could the waterfall contrast schemes be better named ? I think they correspond to:-
    • Normal Linear
    • 1. Square law
    • 2. Square law between 21% and 50% spectrum range
    • 3. Square law between 31% and 60% spectrum range
    • 4. Square law between 41% and 70% spectrum range
    Regards,

    Martin - G8JNJ





    WA2ZKD

  • add DTG to Log

    G8JNJG8JNJ
    Hi,

    I'd also like to add the KiWi ID to the time and date, so that it makes it easier to use the data at some later date if a centralised database is ever established.

    Covered in these previous threads.



    Regards,

    Martin - G8JNJ
    WA2ZKDKA7U

  • Contact: causes issues [universal browser issue, can't be fixed]

    G8JNJG8JNJ
    Hi,

    This is a known issue in the bugs list.

    • Javascript stops on "sendto:" email links. This is a browser problem that may never be fixed according to stackoverflow.com

    Regards,

    Martin - G8JNJ
    WA2ZKD

  • add DTG to Log

    G8JNJG8JNJ
    Hi,

    I'd also like to add the KiWi ID to the time and date, so that it makes it easier to use the data at some later date if a centralised database is ever established.

    Covered in these previous threads.



    Regards,

    Martin - G8JNJ
    WA2ZKDKA7U

  • WSPR and who is logged on

    G8JNJG8JNJ
    Hi,

    Maybe the user info could be put on the top banner where there seems to be plenty of space.

    The pop out panel which gets hidden by any extensions that are running could then be removed.

    Maybe if multiple extensions are being run they could overlay each other with tabs on the edge ?

    Regards,

    Martin - G8JNJ
    WA2ZKD

  • Direction Finding and linking existing KiwiSDRs

    G8JNJG8JNJ
    Hi All,

    I agree even a 100km accuracy would be a good starting point. The advantage of the KiWi network is that it is farily well distributed so once you have a rough location it should be possible to use other KiWi's closer to the suspected location to obtain a more accurate fix. Alternatively lots of fixes could be combined to produce a good average.

    In the UK the radio regulatory body (OFCOM) has a distributed network of 24 remote receiver sites with 20MHz to 3/6GHz DF capability. I believe this uses Keysight / Aligent N6841A units as demo'd in the video linked below.



    Some more background info can be found here


    Some of the research before OFCOM deployed the current network.


    Token - I could add a PPS marker to my KiWi which could be switched in by means of the antenna switch option if this would help with any project. I think Peter, G3PLX, came up with this idea some time ago and I'm keeping him informed about the KiWi enhancements WRT TOA DF'ing as I know this was (and may still be) of interest to the IARU and other National Societies.

    Regards,

    Martin - G8JNJ











    KA7U

  • HF Broadcast Schedules

    G8JNJG8JNJ
    Hi,

    Whilst obtaining the data to answer Ron's question regarding DRM broadcasts, it got me thinking.........

    There is a very comprehensive list of HF broadcast schedules listed at http://www.hfcc.org/data/b17/

    I wonder how feasible it would be to parse this and populate a DX.json file (or similar) of broadcast stations from this information ? The DX tags could then change according to time date and BC schedule a bit like the IBP tags.

    The transmission schedules change with seasons, so this could be updated as and when required.

    Regards,

    Martin - G8JNJ


    KA7U

  • Good DRM Decodes - Radio Romania International - 7235KHz

    G8JNJG8JNJ
    Hi All,

    Good DRM decodes this evening from Radio Romania International - 7235KHz - SNR Tiganesti E1, Tiganesti, Romania


    Regards,

    Martin - G8JNJ
    KA7U

  • New Owner Questions [S-meter OV, audio underruns, tags, GPS sensitivity]

    G8JNJG8JNJ
    Hi Kevin,

    1. On the S-Meter, even with a low signal report, I get the "OV" light up, is this normal, and should I worry about it?

    It indicates ADC overload, if you look on the spectrum display you may find some broadcast signals are above the -30dB line. An attenuator, or better still notch filters will help with this.

    2. Occasionally the web page (with my SDR) stops with "audio underrun", I have to refresh the page, and it's back to normal. Is this happening because I am using something else on my PC? (running through Chrome). Checking the log, does show this error message.

    It happens occasionally some browsers are more prone to it than others. 

    3. I notice the tags at the top of the frequency, is it possible to easily to add my own tags, or are they imported from a source file?

    Shift left click on the banner above the waterfall.

    4. I need to put the GPS antenna outside, as it does not show any acquired signals.

    The supplied antenna is not the best. It does work, but it's much better if it is placed outside.

    Most of this is covered in the on-line guide http://kiwisdr.com/quickstart/

    Regards,

    Martin - G8JNJ


    ZL1KFMWA2ZKD