DE1934550A1 - Transportable coaxial cable - Google Patents

Description

η. i.c; -iUO £ 7PP K

PATEK.-α; .WALTE _{1QO / ccn}

8 Munich 25 Lipov / Skysir. IQ · Tel. 778950 '"" ^ * ♦ b b U

Our mark: no-kl-10

Date:

4th July 1969

Bernt Klostermark

Transportable ^ coaxial cables

It is a well known effort to reduce cable attenuation between an antenna and to keep the associated punk equipment as low as possible, among other things to avoid unnecessary losses.

When using high frequencies, e.g. for radio relay connections, this is really important. With fixed installations, it's pretty easy to a suitable coaxial cable, taking into account the attenuation ratios choose, even if the cable is so stiff because of the construction, so that it can only be bent once.

In known, mobile radio relay stations with a rollable on a drum In practice, however, cable is the choice with regard to the attenuation properties Cable that is sufficiently coarse is limited by the requirements for flexibility. The coarser the cable, the less attenuation you get, but the stiffer the cable. The gradually appearing trolleys do not allow overly large cable drums to be transported and if the diameter of the drum is too small in relation to the flexibility of the cable, the cable will already after one small number of unwinds and reels damaged

A cable rolled on a drum also has another disadvantage, namely that it is influenced by external magnetic fields. In the case of nuclear weapon explosions, for example, a very strong, short-lasting magnetic field is generated (the so-called EMP effect) which, within a radius of several kilometers from the detonation site, can destroy a cable rolled on a drum.

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The present invention aims to provide a coaxial cable in which the risk of impermissible bending stresses occurring is avoided in difficult usage conditions, and also not on a large cable drum, which is used for disruptive magnetic fields is sensitive, needs to be rolled up.

The invention relates to a transportable coaxial cable, -der is mainly characterized in that it consists of several elongated pieces of stiff coaxial cable of in the main the same Lengths and intermediate elongated portions of fairly easily bendable cable, these intermediate elongated ones Share with the stiff cable parts through electrical connections, which are partly the inner conductors of the various cable parts and partly their outer conductors or electrically interconnect the jacket, as well as connected by mechanically durable connections that absorb mechanical loads are.

The invention is described below with reference to the accompanying drawing described.

Fig. 1 shows a short section of a portable cable according to Invention.

Pig. Fig. 2 shows, on average, a junction between a rigid one Part and a bendable part of the cable according to an embodiment of the invention.

Fig. 3 shows, on average, a junction between a rigid one and a bendable part of the cable according to another embodiment of the invention.

Fig. 4 shows, on a very small scale, a finished cable made up of several rigid elongated parts and several bendable elongated parts of the cable and also from connection means at the ends of the cable, with the whole cable unfolded and is tied together in an easily transportable bundle.

The cable shown in Fig. 1 consists of a number of practically inflexible, stiff, elongated parts of the cable, denoted by 1 are, as well as a number of fairly easily bendable, elongated ones

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Parts of the cable, which are designated with 2, and those with the stiff elongated Parts of the cable 1 connected to permanent connections 3 are.

Though in the Pig. 1 only parts of the three stiff, elongated parts of the Cable 1 and two easily bendable, elongated parts of the cable 2 are shown the cable can of course consist of any number of such sections. The cable sections 1 should be essential be longer than the cable sections 2, so that the total attenuation of the cable is only slightly worse than the attenuation of an equally long cable would be that of a single, elongated part with the same Character as that of each of the cable sections 1 would be formed. The cable sections 1 and 2 should have the same characteristic, i.e. the same Have impedance so that reflections at the joints 3 are avoided.

A prerequisite for getting a cable with low attenuation is also that the joints are carried out in a suitable manner.

How ee out from the Pig. 2 and 3, the stiff sections of the eyelet can be used 1 from an inner conductor or core 4, which consists of a rather inflexible copper rod or copper tube, together with an outer conductor or Sheath 5, which can be a rather inflexible copper tube, be formed. Between the core 4 and the cladding 5 insulation is attached, which the Can completely fill the gap, but optionally from insulating washers 6 may exist, two of which are shown in FIGS. 2 and 3, respectively. Is there an external insulation outside of the Kanteis 4? made of polyvinyl chloride or the like attached »This is at the connection point Isolation removed on the part shown. The final part of the isolation is marked with 8 '. The easily bendable cable 2 can consist of a Core 9 consist of a flexible copper wire, which is covered by a sheath in the shape of a stocking or the like 10 is surrounded. Outside the Insulation is attached to the jacket, which is designated by 11. This isolation is removed at the junction and the terminating part of the insulation is denoted by 12. As in the cable 1, the core 9 can be central be held in the jacket 10, either with a solid insulation, or with insulation disks 13, which are somewhat separated from each other. at At the junction, the core 4 of the rigid cable 1 is drilled out, and The core 9 of the flexible cable 2 is inserted into the bore, as the number 14 shows. The core 4 of the rigid cable 1 can be wrapped around the core 9 of the

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bendable cable 2 be clamped, or these two cores can be at the Junction 14 be soldered to one another.

Felter is in the embodiment according to the Pig. 2 the stocking-shaped coat 10 of the flexible cable 2 pulled out and on one outside the insulation 7 protruding part of the sheath 5 of the rigid cable pulled up, as the number 15 shows. At this connection point, the stockings

10 be soldered to the jacket 5, or with binding wire or the like to be clinged to. The connection point can be between points 8 and 12 be surrounded by an insulation, which is denoted by 16 and which can consist of a wound tape or a shrinkable one or slotted insulation tube can be formed, which may is first pulled over, for example, the cable section 2 and then fed back over the connection point. At junction 5 and Incidentally, on the whole cable there is an outer insulation 17 made of e.g. FVC plastic, which hermetically seals the various connection points of the cable locks. This PVC plastic is attached when the Cable is completely assembled and covers the whole cable from one end of the finished cable to the other.

In the embodiment according to Pig. 3 is the jacket of the flexible cable 2 truncated at 18. It doesn't have to be a metal stocking, it has to be can, for example, make an interlocking sleeve from a sleeve Bands exist. A special metal stocking 19 is drawn in this embodiment over the entire elongated part of an attachable cable 2, and attached so that it extends past the two connection points 3 through which the bendable cable 2 with the adjacent, rigid cable sections 1 is joined together. The stocking 19 is electrical and mechanically with the free sheath ends 20 of the rigid cable sections as well as with the stripped ends 21 of the jacket of the flexible cable 2 " bound (e.g. by soldering), by the way, the stocking 19 is on the insulation

11 attached to the bendable cable 2, which is on the right in the Pig. 3 illustrates is. The outer insulation 17, which covers the entire finished cable including the joints, is, however, attached above the stockings 19.

In the arrangement after the Pig. 3 forms the stocking 19 an electrical one Connection between the sheaths of the different parts of the cable. Simultaneously it forms such a mechanical connection, the mechanical

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absorbs stresses in the longitudinal direction of the cable between the stiff parts of the cable can occur. In the embodiment according to FIG. 2, it is the stocking-shaped jacket of the flexible cable, which is of part of the longitudinal, mechanical stresses will.

In the embodiment according to FIG. 3, the stocking 19 can have a so-called. Draw stockings of a known type, i.e. braided stockings Made of resilient wire, which can be compressed in its longitudinal direction and whose diameter increases when the stockings are compressed. One however, such stockings are often made of ferromagnetic or other for Transfer of high-frequency electrical energy unsuitable material. Therefore, in such cases, one should wear a copper-braided stocking (not shown) inside the pulling sleeve.

Instead of using a fully insulated coaxial cable as the starting material, you can use a cable that has no insulation outside the jacket. After the various cable parts have been joined together in one of the above-mentioned ways, the cable is made with a coherent, external one Isolation 17 verses.

TJm ensure that the junction 14 of the cable cores does not have the surrounding stocking 10 or 19 comes into contact, an insulation 24 outside the connection point 14 are attached. This insulation can consist of an insulation body that is divided into two halves and can be attached around the junction. Such an insulation can also be made around the connection point by compression molding with a special tool be attached. The insulation body can either be solid or provided with channels or grooves (radial or axial) that determine the dielectric constant of the insulation body brings it down to a suitable value.

The connection point 14 need not be designed as in the context is described with the embodiments shown. The junction can alternatively consist of a connecting tube, in the two ends of which the ends of the cores 4 and 9 are inserted and soldered or clamped are.

In Fig. 4 it is shown how a cable according to the invention becomes easy transportable bundle is wrapped together, that. von Hiemen. 22 together

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hold is.

A coaxial cable according to the invention can of course have coaxial connections 23 at its ends so that it can be connected between e.g. an antenna and a transmitter without difficulty. The cable can be terminated at its ends by bendable parts to which the coaxial connections are attached in order to connect the To facilitate the cable and to allow bending of the cable near the connection points.

Various modifications of the invention can be made within the scope of this of the attached claims will be made

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Claims (6)

Claims Transportable ^ coaxial cables, characterized in that that it consists of several elongated parts (i) of relatively stiff coaxial cable consists of mainly equal lengths and intermediate, elongated parts (2) of fairly easily bendable cable, wherein these intermediate elongated parts with the rigid cable parts by electrical connections, which are partly the inner conductors of the various Electrically interconnect cable parts and sometimes their outer conductors or sheaths, as well as mechanically durable connections that are subject to mechanical loads record, are connected. 2. Transportable ^ coaxial cable according to claim 1, characterized marked that the inner conductor (4 »9) of the cable parts (1,2) are connected by coaxial connections (14) designed in this way are that the inner conductors (9) of the flexible cable parts (2) are inserted into central bores of the inner conductors (4) of the stiffer cable parts (i). 3. Transportablej coaxial cable according to claim 1 or 2, characterized geke η η ζ e 1 ch _r η et that at each joint, the outer, sock-shaped conductor (OK) of the flexible cable part (2) is pulled over the outer conductor (5) of each adjoining rigid cable part (1), and with this conductor (5) is mechanically and electrically connected. 4. Transportable ^ coaxial cable according to claim 1 or 2, characterized marked that the whole area between two stiff Cable parts (i), including the entire length of a flexible cable part (2), two connection points (3) and the ends of the adjoining rigid cable parts (1) is covered with a metal hose, e.g. Pulling sleeves that create a mechanical connection between the various parts of the cable. 5. Transportable * coaxial cable according to one of the preceding claims characterized in that the entire cable (1, 2) including the connections {3), with a hermetic layer (17) made of plastic or rubber. 6. Transportablej coaxial cable according to one of the preceding claims characterized in that the various parts (1,2) of the cable have the same electrical characteristics. 0 0 9 8 3 S / 1 1 7 5 Blank page