DE2718684A1 - Directional radio waveguide laying method - uses clamping unit at foot of mast and flexible waveguide section at top of mast - Google Patents

Abstract

A method is used for laying an electromagnetic circular waveguide in a vertical position on a mast. The waveguide is made of several discrete lengths of piping these being fixed to the mast by means of sliding clamps, and is of the type used in broad-band directional ratio engineering. To enable the waveguide to be fastened to the mast in a simple manner without so much expense being involved as when conventional methods are used, and yet to allow movement of the waveguide sections due to temperature variations to be taken up, according to the proposed method, the waveguide is fixed, at the foot of the mast, in a suitable clamping unit for connection of an incoming cable. At the upper end of the waveguide a flexible waveguide section is connected to enable expansion or contraction of the waveguide to be balanced out.

Description

Procedure for laying an electromagnetic round

Waveguide The invention relates to a method of laying an electromagnetic circular waveguide in a vertical position on a load, with which the hollow conductor consisting of several individual tubes at a fixed point fixed and in its course in several places by means of sliding clamps on the mast is determined.

In modern broadband radio relay technology, efforts are made to use the available Use the frequency range as well as possible. For this technique, circular waveguides, Via which two H1l waves polarized perpendicularly to one another are transmitted at the same time can be particularly suitable. Compared to the rectangular waveguide, round waveguides have less attenuation and fewer reflections, since they can be produced more easily and more precisely are.

Rundholleiter are therefore used in modern technology, for example attached to buttons for supplying the antenna. An irobleij here is the faultless one Attachment to the load, as the waveguide consists of individual tubes that work perfectly must be connected with each other, and also significant temperature differences over the year is exposed, which lead to linear expansion. So far, when assembling one Rundholleiters proceeded so that the first part of the pipe is fixed to the top of the mast will. Then the other pipes are nacll and gradually via flange connections attached, while at the same time using so-called spring sliding clamps an additional Connection to the jast is established. These special clamps can prevent movements of the Participate in the lengthways waveguide to a limited extent. The flanges at the joints the tiny tubes are considerable after the entire III ladder has been completed Exposed to tensile forces and must therefore be used with great care and very special fastening methods be attached to the pipes so that the flanges are not loosened by cold flow occurs, which could interrupt the electrical connection.

The invention is based on the object of specifying a method with a circular waveguide in a simple way and with much less effort than has to be attached to an ilast in conventional technology.

This task is carried out with a method of the one outlined at the beginning Kind according to the invention solved in that the waveguide at the foot of the ilastes in a holding device suitable for connecting an incoming cable will.

The fact that the waveguide contrary to the previous procedure not at the top of the mast, but at its base is fixed, results a significant relief of the flange connections of the individual partial pipes of the Waveguide.

These flange connections are made by moving the fixed point down only on pressure, so that the effort for the production the flanges can be significantly reduced. Despite this reduced effort is the required electrical contact between the Individual pipes always guaranteed. Another advantage of the method according to the invention can be seen in the fact that the clamps with which the waveguide in the course of the Route is attached to the jiast, can be simplified compared to known constructions can, since the same only need to guide the waveguide. It can accordingly simple sliding clamps can be used for this holding process. Also regarding a possibly large expansion of the waveguide at very high temperatures there are advantages, as this expansion will have an entirely upward effect, where there is enough space.

The method according to the invention is described below with reference to the drawing for example explained.

1 with a tfast is referred to, on which a schematically indicated Antenna 2 should be attached. To transmit the power wave from one not The transmitter shown for this antenna has a circular waveguide 3 attached to the alast, which is composed of a large number of partial tubes 4. At the connection points the partial pipes are fitted with flanges that are state-of-the-art and accordingly are not shown in more detail. The entire waveguide 3 is at the foot of the mast set at point 5 and in its course through to the top of the mast Sliding clamps 6 held that the waveguide only relatively firmly, but still slidable include and therefore accordingly an emigration from the straight position impede.

The fixed point 5, in which the hollow conductor is fixed, must be designed in this way be that an incoming cable, also not shown, which is connected to the waveguide to be connected, can be connected without any problems.

About the length expansion and subsequent shortening of the waveguide To render the antenna 2 ineffective in the event of temperature fluctuations, is expedient to attach a flexible waveguide piece 7 at the top of the waveguide, through which such movements can be compensated.

When attaching the waveguide 3 to the load 1, for example proceed in such a way that the first part of the tube of the waveguide is fixed at the fixed point 5 will. Subsequently, more partial pipes are gradually added to the ones below Partial pipes constructed by being connected to one another via their flanges. At the same time, the sliding clamps 6 are attached to the waveguide tubes and with firmly connected to the i'iast 1.

However, the method according to the invention can also be carried out be made so that the waveguide in conventional technology from above is put together by first placing the first part of the pipe at the top of the load is determined. After the completion of the entire waveguide 3 is the same then set in the fixed point 5 at the foot of the test and initially as an Isiontagehilfe used fixed point at the top of the sheet is loosened so that the waveguide is then fully held by the fixed point 5 again.

L e r s e i t e

Claims (2)

Claims 1 method for laying an electromagnetic Round waveguide in a vertical position on one iilast, with which one of several Individual tubes existing waveguide fixed at a fixed point and in its course is fixed at several points on the riast by means of sliding clamps, characterized in that that the waveguide (3) at the foot of the sHastes (i) in a for connecting an incoming Cable suitable holding device (5) is fixed. 2. The method according to claim 1, characterized in that the upper At the end of the waveguide (3) a flexible piece of waveguide is attached.