| A home-built low-pass filter for 4m - G4CJZ |
| A home-built low-pass filter for 4m - G4CJZ http://www.70mhz.org/index.php?categoryid=6&p2_articleid=296 https://translate.google.com/translate?hl=&sl=en&tl=pl&u=http%3A%2F%2Fwww.70mhz.org%2Findex.php%3Fcategoryid%3D6%26p2_articleid%3D296&sandbox=1 The Four Metres Website |