SWLing Post Message Board

Another idea, first generate the map, then use this

https://rasterbator.net/

to turn it into a wall size poster

useful if your shack has an empty wall

Another idea, first generate the map, then use this

https://rasterbator.net/

to turn it into a wall size poster

totally agreed !!

this simple antenna https://www.youtube.com/watch?v=Nyttl277ehs can easily be recalculated for the satellites and will offer about 9dB gain at 11° so it may fit start by calculating the wavelenght (Lambda) then multiply it by (about) 1.138 done so you'll have the loop perimeter, the short side will ...

the T2FD "all band" antenna was a military secret till around 1950 when informations about this aperiodic "all band" antenna started to spread https://en.wikipedia.org/wiki/T2FD_antenna yet, the data about calculation behind this antenna arem't clear, so after some ferreting on t...

old military satellites are currently being actively used by some unintended entities I've received FLTSAT transponders with all external antennas I've ever used, including regular 60ft wire dipoles, big loops, small active loops or a huge vertical. With a small log-periodic for UHF/VHF pointed SW ...

As a note, I've been playing with SDRAngel lately https://www.sdrangel.org/ and amongst other features https://github.com/f4exb/sdrangel/wiki/Quick-start the program offers a nice satellite tracker which eases aiming the antenna at a given "bird" :) oh and also see https://github.com/f4exb...

Sounds like somed old military satellites are currently being actively used by some unintended entities, including some truckers and fishermen from Brazil and Russian soldiers in Ukraine, I found the infos here https://www.rtl-sdr.com/saveitforparts-listening-in-on-russian-soldiers-hijacking-us-mili...

a rather interesting piece written by Tom Rauch W8JI

https://w8ji.com/quad_cubical_quad.htm

which clears prettty well the concept of gain, plus some links regarding noise and more stuff worth some attention imVHo

HTH

Wanna help with WSPR and propagation research ? If so, please, have a look here https://turnislandsystems.com/host-a-hamsci-wsprsonde-also-turn-island-systems-in-qst/ "The HamSCI package will include the WSPRSONDE, a 9-Band Filter-Combiner, a Bodnar GPSDO, an 80-10 meter end-fed halfwave antenn...