SWLing Post Message Board

Maybe it's a crazy idea, but... let's start from this https://www.rtl-sdr.com/kiwisdr-tdoa-direction-finding-now-freely-available-for-public-use/ now, let's suppose to put together some code which, by leveraging the above and some map API, may feed an AI to gather further infos (e.g. using search en...

Attached is a (zipped) "csv" file containing a list of web published SDR receivers

nothing special, but may hopefully be useful to someone

I was reading infos about this active loop https://www.amazon.com/GOOZEEZOO-K-480WLA-Shortwave-0-5MHz-500MHz-Battery%EF%BC%88Built/dp/B0CMD3LD9Z avaipable from amazon and aliexpress, according to the infos I gathered the amtenna has a masthead wodeband amplifier as many others, but the "shack&q...

The schematic is here http://ve2azx.net/technical/FMT/L-C_FilterSchematic.pdf the inductors are molded ones, that is "nothing to wind", the variable capacitor can be a "plastic polyvaricon", so it's simple to build, now... look at the response curve, a nice "bell" with ...

OMG, hope you'll get better soon !! As for the antennas, I believe that the "pipe" may be able to survive harsh weather better than the SULA, if you look at the image, you'll notice that everything is enclosed/protected by the pipe, including the coax connector, and then the pipe is small ...

If you can/want, it will be interesting to see a video comparing that antenna with the stock one (or with some other antenna) Right now I am in Trondheim, but I am planning to do just that when I return home at the end of this month. Forgot to say that I made the SULA made with some break line had ...

Also, a DUE note ! The idea came after a request from my dear friend Kostas ( SV3ORA ); he asked me if it was possible to make the "SULA" smaller and less visible (basically it shouldn't look like an antenna) and told me that ideally he needed some given dimensions At first, knowing all th...

Hi Egil !! Happy to read that my impressions have been confirmed; while that antenna isn't "par up" with the SULA, its main advantage is the fact that it's really compact; as for the resistor value, yes, that one should be changed if the antenna size isn't the same as the one I posted, and...

here's a better setup for the antenna; notice that the choke MUST be installed otherwise the cable could (would) become part of the antenna and totally screw the cardioid pattern; in this setup most of the wire runs inside the upper pipe so it's protected from UV and weather, same goes for the 9:1, ...

Here's a general idea to build the antenna, notice that the resistor may be placed inside the upper pipe, by drilling two holes, also, the two pipes are both PVC ones, the top one is sealed at top with a cap and all holes used to pass through the wire are sealed with good sealant, the 9:1, preamp an...