efhw compensation coilpolyblend vs polyblend plus grout

However, the insertion loss of the packaged transformer would be intolerable on the 10 meter band if it appeared the same way with an antenna wire connected. Looking at several builds and discussions, such as commercial antennas (e.g. application of Kirchhoff's current Law on a typical EFHW antenna configuration. The Counterpoise is a short, typically one twentieth (0.05 * ) of the wavelength. Software Engineer - EDI - salary.com It is all about getting the heat out. The 6-turn loading coil lowers the resonant frequency into the CW portion of the 80 meter and higher bands. It is quite difficult to satisfy both requirements of achieving proper impedance ratio and resonance of the tank circuit at each tap of the inductance. Trapped five band EFHW SOTA antenna. End Fed Half Wave Antennas: Is a Primary Capacitor Really Needed? I was curious why this capacitor was added to the transformer. Each geodesic great circle path displayed on the map originates from your location that is derived Read More, The Great Circle Map GCM We present an automatically rendered Great Circle Map GCM based on your location derived from your Internet IP address. Throw one end of the antenna wire, extended with a rope, as high as you can on a three, and walk away with the other end and attach it to the tuner. It is basically an end fed half wave dipole on 20m/40m and an end fed full wave dipole on 10m. The VSWR plots below show results from the same transformer tested on the bench with minimal output capacitance, with a primary compensation capacitor, either 100pF or 27pF included, with the transformer installed in its aluminum box including antenna connector feedthrough, and with the transformer with an 18 clip-lead on the antenna output. I then used a piece of heat shrink on the outside to hold everything in place. The Counterpoise is a short, typically one twentieth (0.05 *. ) I placed the box in a cool oven and let it get up to about 200 F, soak for a while, and then I took it out, hung it in still air and measured the temperature as time passed and the box cooled.

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