DE428628C - Loop antenna divided into switchable windings or groups of windings - Google Patents

Description

GERMAN EMPIRE

ISSUED ON
May 12, 1926

REICH PATENT OFFICE

PATENT LETTERING

- M 428628 CLASS 21a ⁴ GROUP 47

Dr. Erich F. Huth G.m.b. H. in Berlin and Dr. Karl Rottgardt in Berlin-Dahlem.

Loop antenna divided into switchable windings or groups of windings.

Patented in the German Empire on December 4, 1920.

The invention relates to a winding ■ A loop antenna has one of its

or turn groups subdivided frame- j number of turns and mutual arrangement

antenna, with or without amplification! self-induction dependent on the turns,

To enable reception of any kind. With which usually the same frequency

you can use signs acoustically or optically; sits like the wave to be recorded. Often will

made perceptible or scribe 'and this given magnitude of self-induction

Fast writers can be controlled. Difficulties in voting

insofar as the self-induction of the antenna increases, for example, for certain wave ranges is large and either the capacity to be switched requires large equipment or at Disconnection of parts of the winding of the antenna freely swinging parts of the winding result, which give rise to disturbances in the vote.

According to the invention, the in

ίο subdivided turns or groups of turns Loop antenna by means of a selector switch or the like. Made variable in such a way that on the one hand a desired size of the antenna self-induction can be set, on the other hand but all turns or groups of turns remain switched on. The switchover 'The turns or groups of turns is carried out in such a way that individual ones of these or all of them are connected in parallel. This ensures that the Self-induction of the antenna can be kept within limits that one can use with relative small additional tuning means or even without them, but there are also disturbing free ends of the antenna completely avoided.

For example, the antenna can be divided into two, three, four or more expediently equal parts. When divided into two halves, the two halves can be connected in series in one position of the selector switch * or in parallel in the other position of the selector switch. If the antenna is divided into four parts, the circuits shown in the drawing, for example, can be achieved with the aid of the selector switch. Either all parts of the antenna 1, 2, 3, 4 can be connected in series (Fig. I), or the parts 1, 2 can be connected in parallel and with the parts 3, 4 in series (Fig. 2), or parts 1, 2, 3 are connected in parallel with each other and connected in series with part 4 (Fig. 3), or parts 1, 2 and 3, 4 can each be connected in parallel and the pairs connected in parallel can be connected in series (Fig. 4), and finally, all four parts can be connected in parallel to each other (Fig. 5). Tung have similar scarf arise in trichotomy, etc. Obviously, the self-inductance of the antenna so be variable within wide limits, and it will be possible aufzu both long and very short waves take _r. Fig. 6 shows the arrangement of the winding groups 1 to 4 in the scheme, for example with a square loop antenna. The winding group ι has the ends a Ji, the winding group 2 the ends b, g, the winding group 3 the ends c, f, the winding group 4 the ends d, e.

Fig. 7 shows the circuit diagram according to which this switchover can be carried out. You get four changeover switches Z, m, n, ο with five switch positions and two simple changeover switches p, r with two switch positions. The switches /, m, η, ο are brought into the relevant positions one after the other; During the first four positions of these switches, the switches p, r are in the position shown, while they are in position V in the fifth position. / ", k are the terminals] which lead to the actual receiver" or to an additional tuning element (Fig. 8).

These parts of the loop antenna can be switched over directly at the connection point of the leads are made by the actual receiver, so that practically a total of two leads to the latter to lead. The additional tuning element can, in addition to a controllable capacity, also a be controllable self-induction. Its attitude is inevitably dependent on advantage from setting the antenna self-induction. A remote control can also be used to switch the antenna windings. for example, by multi-position relays, in particular when the antenna is removed from the location of the actual receiver is appropriate.

Claims (2)

Patent Claims: 1. Loop antenna divided into switchable windings or groups of windings, characterized in that the individual turns or to change the natural oscillation of the frame Winding groups are always connected in parallel or in series by means of a selector switch that in each circuit, excluding the circuits of the largest and smallest natural oscillation value, for the purpose of Avoid free-swinging ends, all turns remain switched on. 2. Loop antenna according to claim 1 with additional tuning means switched on, characterized in that inevitably with the setting of the antenna self-induction that of the additional voting means also takes place. 1 sheet of drawings.