G8JNJ

Fldigi has a decoder, but I note that there are a number of Linux based parsers and decoders too.

Just a quick selection.

Regards,

Martin

Hi Philippe,

I'd agree with John that it doesn't make sense to list KiWi's that folks can't openly use.

But I do understand your reservations, and some countries are definitely more restrictive than others.

Short range local VHF / UHF communications are certainly more problematic from a legal perspective than HF communications, which generally tend to completely ignore geopolitical boundaries

Maybe it would be worthwhile emailing some of the other KiWi admin / operators in France, to see if they have the same concerns as yourself ?

Regards,

Martin

A bit more information for those interested in Wave Radars, cut an pasted links from discussions on other sites.

CODAR and WERA (now Helzel) are very similar systems, and I think that folks tend to call all of them CODAR, a bit like some brand names becoming used for all products of a certain type regardless of the actual manufacturer.

There are plenty of WERA systems operating, but maybe not in the USA, even so the chances are you will have heard one, but thought it was CODAR.

https://helzel.com/

List of USA radars including manufacturer.

https://hfrnet.ucsd.edu/sitediag/stationList.php

You can also use this map.

https://cordc.ucsd.edu/projects/hfrnet/

Select station placemarks in the overlay menu to show them on the map.

If you click on each map pin it will give you more data, including the operating frequency.

Alternatively, there is this list, but it takes a very long time to load.

https://hfrnet.ucsd.edu/sitediag/stationList.php

WERA have a range of products, some of which have slightly different characteristics.

The European ones are listed in a table at the end of this document

https://eurogoos.eu/download/eu-hfradar-inventory-2016/?wpdmdl=9972&refresh=63f157c239dcf1676761026

An interactive on-line map of the current European sites can be found here.

https://eurogoos.eu/high-frequency-radar-task-team/

Regards,

Martin

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