![]() ![]() 1,5 – 15 MHz, 3,0 – 30 MHz, 5,0 – 50 MHz)Īs such, LOW band optimized, high HF and wide range HF optimized variants are available. ![]() Using different types of ferrite material and by manipulating the number of windings, the CMC impedance maximum can be optimized over a decade of the frequency range. These single core line isolators are effective over the entire HF frequency range. Noise floor can effectively be lowered by several dB. When installed correctly, the line isolator will effectively avoid RF from entering your shack, possibly causing RF interference in your TRX and other electronic equipment in your house, as well as avoiding RF noise caused by digital electronic devices to reach the antenna and enter your wanted weak signal receive path in conducted emission mode. The most popular, convenient and recommended places however are at the bottom of the tower or at the building entrance. The Common-Mode Choke line isolators can be installed at any place in the coaxial feedline. This configuration results in higher TX common-mode current rejection ratios and higher RX noise rejection characteristics. ON7FU line isolators are characterized by their high common-mode choke impedance over the specified frequency range, including the largest possible resistive part contribution.įurthermore, a grounding terminal is provided, allowing for connection of one side of the isolator to a clean RF ground, thus forming an “L” configuration filter for sheath currents, and providing additional (secondary) lightning protection. Such conditions are often found in HF antenna installations with non perfect balanced behavior, like Windom antennas, antennas in the vicinity of obstacles, end-fed wire antennas with the coaxial cable acting as counterpoise or verticals with less than perfect ground systems. ![]() They are intended to be placed in the coaxial transmission line of radio amateur HF antenna installations, to eliminate common-mode (outer shield surface) currents caused by non-perfect transitions of a-symmetric to symmetric media. These devices are a variant of the well known ON7FU 1/1 high power current baluns, built using the same high quality materials and proven construction standards. ON7FU coaxial line isolators are compact high power potted Common-Mode Choke type 1/1 UNUNs. This CAN (no guarantee !) be a solution for RF feedback and so on We decided to sell this type also in the Stockcorner Webshop. Hugo designed in the past also a very high quality coax line isolator. ![]() While testing continues, half 2017 results proved successful and a first series of products were built, which are now available through Stockcorner’s webshop exclusively for Stockcorner antenna tuner applications, or via the ON7FU website for general purpose applications. The test BALUNs were placed in different antenna setups, and stressed under most harsh operation conditions. ON7FU built some prototypes, which were extensively tested by Stockcorner engineers. ON7FU agreed to cooperate with Stockcorner, and based on his experience, supplemented with Stockcorners knowledge of high power automatic remote antenna tuners, a heavy duty tuner BALUN was defined.īecause of the delicate application, being deployment at a random impedance environment, key development goals were defined as highest possible common-mode impedance, high voltage withstand and low saturation sensitivity. After a short meeting and exchange of information with Hugo, it was recognized that both companies needed a reliable “Antenna Tuner BALUN” in their product line. ![]()
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