By William I. Orr, Stuart D. Cowan
This authoritative guide covers the layout, building, deploy, and operation of fifty two vertical antennas.
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5 m) and in lengths up to 15,000 ft (4572 m). The base-film manufacturer must ensure that the base film has the right balance of surface smoothness for recording performance and roughness for runability in the coating and processing steps. Small-particle-size, inorganic additives are incorporated in the PET to provide slip properties in film that would be otherwise unmanageable. These surface asperities must be critically controlled, especially for short-wavelength Magnetic Tape 8-27 recording applications, since the base-film surface-roughness profile can be carried—to a degree—through the magnetic coating and reflected in the tape-surface roughness.
The AM chrominance subcarrier is added to the FM luminance carrier and recorded on tape. Part of the lower sideband of the FM luminance signal is removed to allow for the chrominance signal. 5-MHz-wide double sideband signal. This signal is amplitude modulated onto a carrier near 650 kHz, which is added to the FM luminance carrier for recording on tape. 6. At present, all color-under systems are helical-scan machines. Normally, two heads are used to record the combined signals, one for each field.
5 reproduce voltage versus input current is shown for two different wavelengths in square-wave recording for video tape (Ampex 196). If true saturation were to occur, the curves would increase initially with current as the tape is recorded, and then level, representing a magnetization saturated to full remanence and recorded fully through the tape thickness of 200 µin (5 µm). However, at short wavelengths these curves are peaked, and the current that yields the maximum output represents recording only a very small distance into the tape.
All about Vertical Antennas by William I. Orr, Stuart D. Cowan