Earchi S9 vertical antenna - I still use it скачать в хорошем качестве

Earchi S9 vertical antenna - I still use it

The S9v31 is a tough, yet ultra-lightweight vertical designed for Amateur Radio use from 40 through 6 meters. The antenna is constructed of rugged tapered fiberglass, and weighs just 4 pounds. This project produces an inexpensive, multiband, end fed HF antenna matchbox that is quick and easy to setup and use. The end fed feature adds portable convenience, but does present another issue. The problem with an end fed half wave antennas is that the antenna presents high impedance, creating a significant miss-match with the usual transceiver impedance of 50 ohms. This miss match is significantly greater than typical tuners can accommodate without a matching transformer.This project creates a trifilar wound,9:1UNUN (unbalance to unbalance) toroid matching transformer that will match the high input impedance of an end fed antenna into the range where most antenna tuners can produce good performance.The matchbox handles 100 watts of power. This project requires an antenna tuner to achieve satisfactory SWR. http://bit.ly/1XdCfBg http://www.earchi.org #hamradio #SWL #Scanning #hamradio #shortwave