G8JNJ

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G8JNJ
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  • Last Spectrum persists when all signals removed [fixed in v1.279]

    Hi John,

    Brilliant :)

    Makes spotting and determining the amplitude of fleeting signals much much easier.



    Thanks for this (and all the other stuff too).

    Regards,

    Martin - G8JNJ
    KA7U
  • On-Line frequency database

    Copied from UDXF@groups.io

    "You may or may not be aware that the ITU monitoring stations publish their
    listening logs on their public website:

    https://www.itu.int/en/ITU-R/terrestrial/monitoring/Pages/Regular.aspx

    This page describes the purpose of the monitoring activity as well as
    allowing you to download the logs as Excel spreadsheets; there's also a
    search tool so you can search for logs by frequency and date.

    The spreadsheets often include DF bearings with an accuracy indication and
    signal strength as well as time, frequency, mode, comments etc.

    They often mention the kind of things we like listening to!"


    I've previously taken a look at the ITU loggings but they always tended to be a bit of a pin to trawl through.

    However the new database search tool is very good. Especially if you are careful about what search parameters you set. You can then click on a individual log entry for even more detail.

    It would be even better if you could download the searched results, but maybe someone will get around to writing a scraper tool :-)

    Regards,

    Martin - G8JNJ
    G0LUJWA2ZKDHB9TMCKA7U
  • Ethernet filters

    Hi All,

    I see that DX Engineering are now offering Ethernet filters.

    https://www.dxengineering.com/parts/dxe-iso-plus-2


    "DX Engineering ISO-PLUS Ethernet RF Filters are very effective EMI Suppressors that are quickly and easily connected inline on Cat5e or Cat6 network cables. Their patent pending design provides common mode RF interference and EMI noise filtering of radio frequencies from well below 1 MHz to over 100 MHz. DX Engineering ISO-PLUS Ethernet RF Filters are bidirectional (input and output is interchangeable) and they have no effect on digital throughput; Ethernet data signal levels and speed remain unchanged."


    Regards,

    Martin - G8JNJ
    G0LUJjks
  • Seeed Metal case and GPIO connector

    Hi All,

    Just some brief notes regarding the installation of a 15 way D connector on the Seeed metal case in order to bring out the GPIO port for use with an antenna switch.

    The ventilation slot cuts out very easily and only required a small amount of filing in order to make the connector shell fit.

    First the pinout I used



    End view of case



    Top view of connector



    Wiring to GPIO ports



    Side view



    Hope this is of some use to others.

    Regards,

    Martin - G8JNJ
    PowernumptyjksHB9TMC
  • Seeed Metal case and GPIO connector

    Hi All,

    Just some brief notes regarding the installation of a 15 way D connector on the Seeed metal case in order to bring out the GPIO port for use with an antenna switch.

    The ventilation slot cuts out very easily and only required a small amount of filing in order to make the connector shell fit.

    First the pinout I used



    End view of case



    Top view of connector



    Wiring to GPIO ports



    Side view



    Hope this is of some use to others.

    Regards,

    Martin - G8JNJ
    PowernumptyjksHB9TMC