![]() ![]() Directly opposite this gap is the antenna feedpoint shown here with a broadband transformer serving the role of balanced to unbalanced converter. Both share a gap in the outer conductor at the top of the loop. This discussion focuses on a single-turn small loop antenna comprised of a hollow conductor arranged in a closed shape, such as a circle, with an insulated conductor within. This contrasts with tuned loop LF/MF aerials where a capacitor in parallel with the inductance of a multi-turn loop makes for a very selective, narrow band, and likely more efficient, receive antenna. Both this and the popular “gapped” loop configuration are very broadband in nature as testing results, shown below, confirm. The YouLoop uses the crossover Möbius configuration inspired by August Ferdinand Möbius. Scroll down to his figures 24A-E to acquaint yourself of the various forms of small “shielded” loops. Frank Dörenberg (N4SPP) provides an excellent discussion of the small loop as it relates to driving small transmitting loop antennas… The YouLoop’s design derives from a class of electrically small antennas generally called Shielded Loop antennas. Can the YouLoop give satisfactory performance for MF and LF band reception? Small loop background In a world of +$200 small loop antennas that utilize relatively thick and hearty aluminum or copper tubing, the thin coax that makes up the actual loop appears to be a strategic compromise. The YouLoop is available at an affordable $30-40 US. The YouLoop small loop antenna is a recent addition to the product line from Airspy.
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