Since some time, Google requests a billing account for the use of their Google maps, what i refuse to do... My scripts "WW locator map" and "Rain scatter" since offered a limited map with very few details. I therefore modified my scripts to use the Openstreetmap maps which are beautiful and detailed. Enjoy the new maps, and feedbacks are welcome !
For my SOTA activities, i recently bought a QRP transceiver QRP SW-3B, which is a three-band QRP CW only for 40/30/20 m. So, i needed an antenna that would allow to use these 3 bands in SOTA portable activity. Already having some experience with the EFHW antenna, i decided to build one for 40/30/20m. The main advantages of this EFHW antenna are : - easy to build - multiband - needs only one support, can be installed in line, inverted V, zigzag. - fed at its extremity, can be directed connected to the transceriver, without any coaxial cable. - the radiating part is at the center All these advantages are welcome for portable operations and make this antenna a perfect candidate for SOTA
I used the Cushcraft A3 et A4s yagis and soon or later, problems are appearing.. Here are the results of my investigations and repairing technic, that can be applied to other models and trades as well. What is described here applies to a A4s triband antenna, but the reasoning can be made for any multi-band yagi or vertical.