We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
OPERATION OF NEW ANTENNA AT KYW
About seven months ago KYW made first use of a new type of antenna, that in effect consists of two vertical radiators, so spaced and properly adjusted in such a manner, as to concentrate the larger portion of the radiated energy in the directed direction. The unique feature of this installation was the utilization of wooden masts for the support of the conductors which radiate the 10 kilowatts of KYW's 1020 kilocycle frequency.
"The beneficial results, due to increased coverage, obtained from this installation have more than exceeded the highest expectations", according to a Westinghouse press release which describes the antenna in detail. "Signal strength of KYW was nearly doubled in the heavily populated centers in and around Chicago.
"The main antenna at KYW, generally referred to as the Exciter Antenna, consists of a wooden mast which supports a section of copper tubing 204 feet in length. When first installed, an attempt was made to work the antenna as a half-wave radiator.
A tuning coil was placed midway between the top and bottom of the pole and at a height of about 100 feet, and current fed by means of a two-wire transmission system to the transmitter. This particu¬ lar system presented some difficulty in the matter of tuning and adjustments and after some experiments were made, it was decided that a quarter-wave, under the circumstances would be more feasible. Since January 5, 1933, the Exciter Antenna has been worked as a quarter-wave, its advantages over the half-wave being that it is little affected by weather conditions and can be tuned and adjusted at the base of the mast. Also as the present method of operating the quarter-wave antenna makes use of a ground consisting of copper sheets and radial wires, the wood pole is very nearly at the same potential as the antenna itself, thus doing away with the possibil¬ ity of loading considerable portion of the radiated energy into the supporting mast.
"When the antenna was first installed, three sets of guys, consisting of four guy wires each, were made use of to hold the mast erect. The top-most set of guys was approximately 140 feet above ground. There remained, unsupported, a 60 foot section of the mast at the top. It was decided that this presented a hazard in the case of high winds or ice collecting, and an additional set of guys was installed and attached to the mast, approximately 175 feet from the ground. All guy wires had been insulated from the ground and the pole. by means of insulators and were broken up into 40 foot sections. The installation of the latter set of guys dropped the signal strength approximately five percent. More insulators were then installed in this set of guy wires, breaking the sections up into 20 feet lengths. Later, additional insulators were installed on the portion of the guy wires that were in proximity to the antenna. The signal strength then returned to its normal value. Since then, a few extra insulators have been installed in the guy wires on the’ second set, with a slight improvement in field strength resulting.
4