DE218215C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS 21 «. GROUP

in Berlin.

to maintain constant;

Addendum to patent 217731 of September 27, 1908.

Patented in the German Empire on February 7, 1909. Longest duration: September 26, 1923.

The invention according to patent 217731 exists in that the capacitance of two coupled circuits is kept constant when tuned becomes that the entire change takes place only by changing the self-induction and that the entire self-induction of the primary circuit in all occurring cases for Coupling is used while the remainder of the self-induction is the secondary circuit is not used for coupling.

The terms primary and secondary circuit are generally only used for wireless Telegraphic applicable; for other purposes they can be represented by the expressions: circle with largest or smallest capacity can be replaced.

The present invention relates to a further improvement and structural configuration this procedure. An embodiment is shown in the drawing.

The capacitor C ¹ forms the constant capacitance of the primary circuit, the capacitor C ² the equally constant but different value of the capacitance of the secondary circuit, ζ. B. the antenna. The self-induction common to both circles is arranged in the variometer L ¹ , the scale of which is calibrated according to wavelengths or the like. The additional self-induction of the secondary circuit, which does not participate in the coupling, is arranged in a step-wise variable coil Z. ² and a gradually variable variometer L ^{s connected} downstream, the self-induction of which is at least as large as one step of the coil ZA, the coil L ² is accordingly calibrated to the variometer L ¹ according to wavelengths or the like, but not gradually, but variable in steps. The entire arrangement is tuned to a specific wavelength as follows: First, the primary circuit is set to the correct wavelength by setting the variometer L ^1. Then that hole is plugged in the coil L ² , which comes closest in its scale to the similar scale information of the variometer L ^1. The variometer L ^{3 is then} adjusted until the measuring or indication instrument M arranged in the secondary circuit, possibly provided with a shunt, shows the correct adjustment.

The variometer L ³ can also be replaced by any gradually variable capacitor, provided that the steps of the coil L ² are dimensioned so small that the capacitance of the capacitor does not affect the resulting capacitance of the interconnected circuits so significantly that the coupling -

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could no longer be kept constant.

In order to avoid incorrect setting of the coil Z, ² when the variometer L ^{1 is set} , according to the invention the corresponding scale divisions L ¹ and Z, ^{2 are identified} by the same color. For example, the scale of L ^{1 is divided} into 5 segments of different colors and the coil L ^{2 is provided} with 5 connections that are made in the same colors. If the area of the first segment extends, e.g. B. on waves from 300 to 600 m, the connection of the same color is also to be used at L ² for waves that are within this range. Incorrect setting is avoided even better by the fact that the variation organs of L ¹ and L ^{2 are} inevitably connected to one another, or that the variometer L ¹ blocks all plug holes of the coil Z, ² with the exception of the one to be plugged.

Claims (3)

Patent-to sayings: i. Embodiment of the method according to patent 217731, characterized in that the entire self-induction common to the two coupled circles within one According to wavelengths o. The like. Calibrated variometer is arranged and that the not self-induction of the secondary circuit participating in the coupling in a step-wise manner variable, also calibrated coil and an associated fine and gradually variable tuning means, such as a downstream variometer o of the individual stages, with a measuring circuit switched on in the secondary or indication instrument allows the correct coordination to be recognized. 2. Embodiment according to claim 1, characterized in that the each other corresponding positions of the variometer in the primary circuit and the coil in the secondary circuit have the same color or are inevitably linked to each other, in such a way that incorrect setting is avoided as far as possible. 3. Embodiment according to claim 1, characterized in that the variometer in the primary circle, depending on its position, all plug holes in the coil Secondary circuit blocked with the exception of the one to be plugged. 1 sheet of drawings.