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They are Wave Radars, and sweep across the frequency range at a rate of approx 4Hz (250mS).

The ones you are hearing are most likely located at the Hook of Holland and Dyfamed in France, but there are likely to be other sources as it is a common frequency.

My KiWi's have most of the European ones marked with DX tags.

http://wessex.zapto.org:8073

http://websdr.uk:8060

Regards,

Martin

Philippe's comments are valid, but more related to Linear convertors / regulators.

This is what I did, but it is for a switching DC-DC convertor running at around 1MHz.

The capacitors were 10uF 25v SMD and the inductors were axial 22uH that I had lying around.

If running with a 12v input, the input inductors can have a lower current rating than the output inductor.

The whole circuit needs to be enclosed in a tinplate or brass box, and the capacitors need to be directly where the wires enter and leave the box.

Note that in this instance, the input negative is 'floating', but if you connect everything to the ground, then omit the input inductor in the -ve rail.

Regards,

Martin

I should have clarified the way it works a bit better.

Pushing the mouse wheel down whilst rotating it enables the opposite mode to the default that has been chosen. in OpenWebRX.

Having the possibility to tune using the mouse opens up other possibilities such as making your own VFO knob, using the optical encoder recovered from a scrap mouse, or buying one of the more expensive ready-made commercial items.

If it could be implemented in a way similar to that of OpenWebRX , then it would still retain the mouse wheel zoom option for those who prefer it, but offer an alternative for folks who would like to use mouse wheel tuning.

Try it and see for yourself.

http://wessex.hopto.org:8060

If you open up the settings pane in the control panel, you should see the "Hold mouse wheel down to tune" tick box. Also set the tuning step size in the controls section, 500Hz or 1kHz is useful for SSB, as most folks use 'rounded up' frequencies.

I'm not specifically requesting this feature, as I don't wish to add to John's already massive workload of much more important issues, but I can understand the appeal of it.

Regards,

Martin

I have noticed a problem, where folks stay connected or a long period, but they are only viewing the waterfall or spectrum display, and maybe doing something else.

So the frequency and mode they have selected, are sometimes misleading with regard to the purpose the KiWi is being used for.

This is usually indicated by being fully zoomed out e.g. z0

Regards,

Martin

I wouldn't trust a Chinese made torque wrench.

It's unlikely that the KiWi will be repeatedly connected and disconnected as much as some other equipment.

Slightly past hand tight is fine, and don't use a big adjustable wrench.

Regards,

Martin