• [G3XBM] VLF Earth-mode

    From G3XBM via rec.radio.amateur.moderat@21:1/5 to All on Fri Oct 15 03:07:14 2021
    XPost: rec.radio.amateur.moderated, uk.radio.amateur, free.uk.amateur-radio

    Roger G3XBM's (Mainly) Amateur Radio Blog

    VLF Earth-mode

    Posted: 14 Oct 2021 11:25 PM PDT http://g3xbm-qrp.blogspot.com/2021/10/vlf-earth-mode.html

    This was 2012. 6km was spanned below 10kHz through the ground. My stroke
    got in the way!

    Sunspots - Friday October 15th 2021

    Posted: 14 Oct 2021 11:16 PM PDT http://g3xbm-qrp.blogspot.com/2021/10/sunspots-friday-october-15th-2021.html

    Solar flux is 83 and the SSN 24. A=7 and K=2.

    472kHz ATU

    Posted: 14 Oct 2021 09:38 AM PDT http://g3xbm-qrp.blogspot.com/2021/10/472khz-atu.html

    There is a common misconception that 472kHz ATUs have to be big. With low
    power this is not the case. With my 5W I have had no problems at all with a tapped ferrite rod as the photo shows. With the outer of a coax this makes
    a very simple 472kHz station. The 50 ohm connection is very low down and
    the wire will be much further up the rod.

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