A video demonstrating the Yaesu FC- 20 HF/50 MHz Automatic Antenna tuner working for potential Buyers.
Air variable capacitors will not stay in position that they are set to.
... restricted to Amateur Satellite Service frequencies, of course, in firmware. We also are performing special modifications in the area of heat transfer so as not to depend on non-existent convection ... the Service Module's Amateur Station will be a special version of our FC-20 Automatic Antenna Tuner. Because the HF antenna system presents a widely varying impedance, depending on the operating frequency ... FC-20 Auto-Tuner will have been redesigned to accommodate this wide impedance range, with a significant margin of safety both in terms of impedance range and RF voltage specification. Yaesu's ... in assisting the Space Program dates back to the early 1980s, when the initial equipment specifications for Owen Garriott's flight were being drawn up. Our engineers spent countless hours poring ... over out-gassing and other materials specifications, re-configuring our FT-209RH model for on-orbit use in the U.S. Space ...