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The experimental Morgenstern German AI VHF-band radar antenna of 1943–44 used a "double-Yagi" structure from its 90° angled pairs of Yagi antennas formed from six discrete dipole elements, making it possible to fit the array within a conical, rubber-covered plywood radome on an aircraft's nose, with the extreme tips of the Morgenstern's ...
Combined with a signal increase of 14 dB due to height and 11 dB due to lack of attenuating building walls, an outdoor antenna can result in a signal strength increase of up to 40 dB at the TV receiver. [6] Outdoor antenna designs are often based on the Yagi–Uda antenna [16] or log-periodic dipole array (LPDA). [17]
For directional antennas, the Yagi antenna is the most widely used as a high gain or "beam" antenna. For television reception, the Yagi is used, as well as the log-periodic antenna due to its wider bandwidth. Helical and turnstile antennas are used for satellite communication since they employ circular polarization.
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[ab] The simple antennas used to make a Yagi-Uda can either all be linear or bent linear antennas, or all loops (a quad antenna) or (rarely) a mixed combination of loops and straight-wire antennas. Yagi–Udas are used for rooftop television antennas, point-to-point communication links, and long distance shortwave communication using skywave ...
Fisher's first receiver was the model 500, a mono AM/FM receiver using two EL37 output tubes. It had a brass-plated face panel and an optional mahogany or "blonde" wooden case. This early mono receiver should not be confused with the later stereo tube receiver models, the 500B and 500C. [9]
Audio Output: 15 mW at 1000 Ω to external handset; Squelch: Front panel adjustable, active squelch selectable; IF Rejection: Greater than 80 dB; Image Rejection: Greater than 80 dB (First IF image) Intermodulation Distortion: –80 dB or better for two –30-dBm signals separated 30 kHz or more; Overload Protection: Receiver protected to 32 VRMS
This modern DTV antenna uses a Yagi for UHF reception placed in front of a log-periodic for VHF-high. Although the UHF band has five times as many channels as VHF, the antenna needed to receive them is much smaller in both length and width. An older design that also received VHF-low would have many more elements extending to the right.
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