US1969380A - Arrangement for reducing sag in antenne - Google Patents

Description

1934- A. MEISSNER 1,969,380

ARRANGEMENT FOR REDUCING SAG IN ANTENNZE Filed March 7, 1932 Z INVENTOR J9? ALEX/W022 \SSNER.

ATTORNEY Patented Aug. 7, 1934 UNITED STATES PATENT OFFICE ARRANGEMENT FOR REDUCING SAG IN ANTENNZE I Germany Application March 7, 1932, Serial No. 597,216 In Germany March 7, 1931 4 Claims. (01. 250-33) Most antennae must be so constructed that their energy feed lead is connected in the middle thereof. However, the weight of the latter tends to considerably increase the sag of the aerial with I the result that the effective height of the antenna is often reduced from ten to twenty per cent.

Now, according to the present invention the weight of the antenna energy feed lead is to be supported not by the antenna itself, but rather chiefly by means of two traction ropes (messenger or catenary cables) attached at the peaks of the masts or poles or below the same in such a way that only a small fraction of the weight of the energy feed-wire is actually carried by the antenna.

One embodiment of the idea here disclosed is shown by way of example in Fig. 1 of the attached drawing. On the towers T1 and T2 on which the antenna A is suspended, there are secured go at the same time two traction or messenger ropes Z1 and Z2 suspended at a point lower than the antenna and supporting the weight of the aerial feed wire AZ. The latter are insulated, most preferably at the points where they support the antenna feed lead, at a, and at the opposite end on the mast or tower at b.

The pulleys and tensioning means for the said messenger cables Z1 and Z2 and the antenna pull ropes may be joined and made common to each other as shown by way of example in Fig. 2. At the uppermost portion of the mast or tower there is fastened a suitable pulley P, a link L which is common to both of the insulators and is secured to the end of the pull rope H. The various 5 lengths of the cables are made of a suitable length so that the energy feed lead AZ and traction ropes are drawn fairly tight by the pull rope H, whereas the antenna cable AC is made of such a length that there is a slight sag in the antenna and the upper portion of the energy feed lead which is above the traction cable. This slight sag insures relieving the weight and strain upon the antenna which would tend to stretch the antenna wires so as to considerably increase this sag. Therefore it will be seen from the drawing that the transfer of the strain caused by the weight of the energy feed lead is transferred directly in a Y-like formation to the uppermost portion of the towers by means of the traction cables.

I claim:

1. An antenna support arrangement comprising a substantially horizontal antenna supported 5 by a pair of masts, a feed line located substantially midway between said masts, and a common pulley and tensioning devices connected to said antenna and to said feed line to suspend the same between said masts.

2. An antenna arrangement comprising a horizontal antenna supported at its ends by two masts, a single feed line located substantially central between said masts, and common retaining means for both antenna and feed line said feed line being supported by said masts independently of said antenna.

3. An antenna supporting arrangement comprising a substantially horizontal antenna supported by a pair of masts and a feed line suspended remote from said masts, and means for supporting said feed line from said masts independently of said antenna.

4. An antenna support arrangement comprising a substantially horizontal antenna supported by a pair of masts, a central feed. wire located substantially midway between said masts, a pair of traction cables fastened at each end to said masts and suspended below the antenna said cables arranged to be nonparallel with said antenna so that the spacing distance of said cables below said antenna increases toward the center where both ends of said traction cables join said feed wire, so that the weight of the central feed wire will not cause the antenna to sag.

ALEXANDER MEISSNER.

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