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New High-Gain Broadband FM ANTENNAS
ANOTHER WAY RCA SERVES BROADCASTERS THROUGH k ELECTRONICS
Ideal for Multiplexing
Above. Four sections of a BFA FM Antenna pole-mounted and interconnected by ZVt" coaxial transmission line.
Right. Single section of antenna, showing radiator details.
The new BFA series of FM Transmitting Antennas is designed for maintaining the highfidelity sound normally associated with FM. Its broadband characteristics make it ideal for multiplexing. Featuring simplified design, it consists of four tubular stainless steel radiating rings attached to a supporting frame. The shunt-fed antenna sections are interconnected by 3 ^g-inch Universal Transmission Line. Thus, any number of sections can be stacked as shown. Sectionalized construction, low weight, and mechanical simplicity make installation quick and easy.
Reduced "Q" for Broadbanding— Necessary broadband for multiplexing is accomplished by stacking the four rings of a single section to reduce the "Q". A "Q" value of approximately 30 is easily achieved. Higher gains are obtained by discreet spacing of the sections.
Low VSWR— The new antennas will meet a VSWR specification of 1.2/1.0 or better when antenna is topmounted. If side-mounted, a VSWR of 1.5/1.0 is achieved. Built-in input transformer permits field trimming, to obtain a VSWR of 1.1/1.0 or better.
Excellent Circularity— A horizontal circularity on the order of + 1 db is normally obtained when the antenna is pole-mounted. When the antenna is side-mounted on a supporting tower, the circularity is normally better than ±3 db. In those cases where close-in coverage is
desired, this antenna can be supplied with null fill.
Built-in De-icers— These new antennas are available with built-in de-icers which are installed at the factory. Under normal icing conditions the 250 watt heating unit should prove adequate, however, for severe icing conditions, the heater may be supplied with 220 volt AC to increase the heating capacity to 1000 watts for short periods of time. An optional item, Automatic Sleetmelter Control, MI-27369, is available, which will serve to operate the de-icers automatically under conditions necessitating their use.
Flexibility in Mounting — The antennas can be mounted in a variety of ways. Mounting hardware brackets and supports art supplied for both pole and side-mounting.
For complete information on the new BFA series of FM Antennas, call your RCA Broadcast Representative. Or write to RCA, Dept. BB-22, Building 15-1 , Camden, N. J. In Canada: RCA VICTOR Company Limited, Montreal.
RADIO CORPORATION of AMERICA
Ms) ®
BROADCAST AND TELEVISION EQUIPMENT CAMDEN, N. J.
BROADCASTING, December 14, 1959
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