XPost: rec.radio.amateur.moderated, uk.radio.amateur, free.uk.amateur-radio

Roger G3XBM's (Mainly) Amateur Radio Blog

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DST100 RX

Posted: 17 Aug 2021 12:06 PM PDT http://g3xbm-qrp.blogspot.com/2021/08/dst100-rx.html


My first commercial RX was a DST100 receiver that I think was an ex WW2
tank receiver by Murphy. It cost my dad £7 from a local garage. It was
built like a tank and was VERY heavy!! At first it was deaf but G3CHN gave
it a service and it came back sensitive. It served me well for several
years when I was a teenager. It was so heavy that it took two people to
lift it. There are more details on my www.g3xbm.co.uk website.

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VLF Earth-mode

Posted: 16 Aug 2021 10:36 PM PDT http://g3xbm-qrp.blogspot.com/2021/08/vlf-earth-mode.html


Amateur VLF is different. As antennas for TX are usually large and powers high to get a signal radiated, very stable and long signals are needed that
are often integrated over hours or days in very narrow bandwidths. For RX
only tiny E-field probe antennas can be very effective.
On my website www.g3xbm.co.uk you will find links to my earth-mode blog
which gives details of my experiments below 10kHz with 5W and simple gear
up to 6km. Big antennas are NOT needed for this. Signals are visible on a
PC screen in seconds. This is a very accessible way of getting on amateur
VLF.

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