![]() ![]() This last point is because not only does the coax cable’s shield radiate when you transmit, but the shield also works as a receiving antenna. This has all sorts of nasty effects, think of: interference, EMI, RFI disrupted radiation pattern of the antenna, restless noise level. The most important reason to use a good BalUn is to ensure that the coax cable does not become part of the antenna system and therefore radiates as well. The 1:2 BalUn 600 Watts is suitable for QRO use. This 1:2 BalUn uses a symmetrical 1:2 impedance transformer. The transceiver has an impedance of 50 Ohm, so an impedance transformation must also be made. The characteristic impedance of a delta loop or quad-loop antenna is about 100 Ohm. This allows us to adapt an unbalanced system (coax cable) to a balanced antenna system (delta loop or quad-loop antenna). ![]() If a delta-loop or quad-loop antenna is powered with a coax cable from the transceiver it is necessary to use a 1:2 BalUn. This Guide helps you to build the 1:2 BalUn 600 Watts DIY kit step by step. Manual 1:2 BalUn 600 Watts for Delta-loop & Quad-loop antennas ![]()
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