DE588515C - Device for receiving wireless signals - Google Patents

Description

The invention consists in a device for receiving wireless signals in which a or several variable elements of the receiving oscillation circuit, which are in continuous motion, automatically be stopped by a signal if the incoming signal exceeds the previously ber has the correct frequency. Receiving arrangements are known per se, which one have a rotating capacitor, which when sweeping the receive wave range stops automatically at a predetermined wavelength. However, it does regardless of the nature of the received signal. According to the present invention the capacitor stops moving each time the recorded signal is within the predetermined Frequency range. Meanwhile it is

ao 'duration of the stop depending on the nature of the signal received. The standstill is not final if the signal is not what you want, but in this case the stopping time is limited.

Several embodiments of the invention are shown in the drawing in three figures shown.

Fig. Ι shows an arrangement with relays, which are delayed by air buffers or clockwork will.

Fig. 2 shows the same arrangement with rotatable relays.

Fig. 3 shows the same arrangement with a telephone dialer.

In the circuit according to Fig. 1, CO is the receiving oscillation circuit, containing the self-induction, S ¹ and the variable capacitor CR; The detector tube L is connected to the circuit, in the anode circuit of which there is a relay MN which responds when it receives sufficiently strong signals. This relay MJV can on the one hand control the automatic dialer, which is described below, and on the other hand a call or alarm dialer, not shown in the figure.

Provided that the controlled voter is an alarm voter, he must be apart from himself Ordinary equipment include:

1. a contact S ₁ , which is closed when '' a first dash of 4 seconds is received,

2. a contact S ₂ , which is closed when - a second dash of 4 seconds is received,

3. a contact S ₃ , which is closed when the third line is received.

The variable capacitor CA sits on the shaft of a small motor MC with a suitable reduction to enable the

Motor to obtain a slow change in the wavelength of the oscillation circuit. A relay C controls the circuit of the motor MC so that this motor is stopped when the relay C is energized. DM is a delay relay with an air buffer or clockwork or the like, which completes its path in 12 seconds and controls a contact 2 in the rest position and a contact 3 at the end of its stroke. An auxiliary relay A is connected to this relay in such a way that when a signal is received, ie when the relay MN is functioning, A is energized and remains energized during the time of movement of the delay relay DM. The relay A. controls the relay DM and in the same way the relay C, which means that when a signal is received, the relays MN, A ₁ DM and C take effect; this latter relay remains energized throughout the functioning of DM , and during this time the motor MC and with it the adjustment of the capacitor Ci? stopped.

An auxiliary relay B is combined with a delay relay DS in the same way as relays A and DM. The delay relay DS is set to ι minute. The whole thing is controlled by the contact S _{1 of} the selector, from which it follows that if a first correct signal S _{1 is} actuated, the motor MC is stopped for 1 minute.

A relay D , which is combined with a contact 10 of the delay relay DS , is controlled by the contact S _2. The Re-

. lais D has the purpose of causing a second start-up of the device B and DS , from which it follows that when the contact S _{2 is} closed, the relay DS works twice and the Motor.MC is stopped for 2 minutes. The contact S ₃ controls the relay C directly; it is closed when the correct signal is received a third time and then remains closed until the operator intervenes. The motor MC has definitely come to a standstill. In general, the final organ that _{controls .S 3 is} arranged in the alarm or call dialers to remain switched on until the person operating the apparatus is actuated.

The operation of the device according to Fig. 1 is as follows.

When the relay C is at rest, the motor runs and with it slowly the capacitor CR, which changes the wavelength of the circuit CO .

The recorded signals are rectified through the L tube. When they are strong enough to put the relay MN into operation, the relay A is energized because it is on the one hand through the contact 3 of DM on the negative pole and. on the other hand through the contact 2 of DM and the contact of MN at the positive pole. Relay A then gives itself the + .. directly through one of its contacts.

The relay A , through its contact 5, causes the relay C to be actuated, ie the motor MC to be stopped. The relay A feeds the delay relay DM ₁ through its contact 4, which is activated for 12 seconds; During this time, the stop d is slowly raised until it rests against the contact 3, at which point the relay A comes to rest.

When relay A has come to rest, relays DM and C are no longer energized. The stop d goes down, the motor MC running the entire time of this downward movement. This time is set to about 2 seconds so that the capacitor CR can now perform a small shift.

It should be noted that as long as the stop d is not in its rest position, the contact 2 is open and the relay A can not receive any new excitation.

If the stop d closes the contact 2 again on arrival in the rest position, everything is as in the beginning; if a signal is picked up at this moment, the unit MN, A, DM and C works and the capacitor is held in a new position for 12 seconds; if, on the other hand, there is no signal, MN is not energized, the 100 motor MC and with it the capacitor CR \ rotate until a sufficiently strong signal is received.

So you can see that every signal causes the capacitor to stop for 12 seconds evokes. The capacitor then adjusts itself until a new signal is received.

Assuming now that the automatic device is _{combined with an auto alarm selector M 0} , which responds to three consecutive lines of 4 seconds, the first of these lines will close the contact S ₁ , the second that of S ₂ and the third that of S ₃ evoke.

At the beginning of the reception of the signal, the unit MN, A, DM, C will function as described above; but if a first line is registered by the voter during this period of 12 seconds, contact S _{1 is} closed. The contact S ₁ controls the unit B and DS

in the same way that the contact of MN controls aggregate A and DM; on the other hand, the delay relay DS is regulated so that the stop takes d ι minute to go up. The relay B remains energized for ι minute and controls the relay C through its contact 9, so the motor and capacitor are stopped for 1 minute.

After this minute the motor starts running again, if no other dash of 4 seconds is registered. If, however, a second dash of 4 seconds has been received, the contact S _{2 is} closed and the relay D is energized; it switches off through the contacts 11 and 10 of the relay DS and keeps the relay C energized through its contact 13, so that the motor remains at a standstill.

After the first minute, when the stop d ' of DS closes contact 6, relay B experiences a new excitation through contacts 6 and 12; the relay DS works again, but a short moment after the start of the movement of the stop d ', the contact 10 is open and the relay D is set to rest.

It can thus be seen that when two lines of 4 seconds are received, the contacts S ₁ and S _{2 are} closed and the motor MC is stopped for 2 minutes.

When the correct signal (three dashes of 4 seconds) is finally received, the contact .S ₃ "is closed and remains closed until the operator intervenes. In this case the relay C is energized and is the motor and the capacitor finally shut down.

In the embodiment according to Fig. 2, the delay relays DM and DS are replaced by control cams CM and CS . The cam CM is driven by the motor MM with one revolution in 12 seconds and the cam CS by the motor MS with one revolution in 1 minute.
The mode of action is as follows.
When the received signals put the relay MN into operation, the relay A 'is energized and puts the motor MM and thus the cam CM into operation through contact 24; contact 25 energizes relay C , thereby stopping capacitor CR. When the cam CM is approached, the contact 22 rises and applies the positive pole to A ', which then remains excited during the entire rotation, ie for 12 seconds.

A little before the end of the rotation opens

the cam of CM the contact 23, whereby the excitation of C ceases and the condenser is adjusted. At the end of the rotation, the contact 22 returns to its lower position. If at this moment there is no signal, the relay Ä is no longer energized, and it sets the engine MC its rotation until the reception of a new signal continues.

When a dash of 4 seconds is received, contact S _{1 is} closed and relay B 'is energized. The motor MS is energized through the contact 28, the cam CS makes a reversal, the duration of which is 1 minute; during this time, B ' remains energized by contact 26 in its upper position and causes C to be energized (contact 29). At the end of the rotation, 26 comes to the lower position and the relay B ' comes to rest while the motor MC starts up.

The functioning of the relay D ' is exactly the same as that of the relay of Fig. 1, in that the contact 30 is open a little after the second start of the cam CS. In the arrangement according to Fig. 3, a delay relay is combined with a telephone step selector.

The relays MN, A ₁ DM and C are the same as in the arrangement according to Fig. 1. The relay DM is also provided with an additional contact 62 which controls the front electric magnet AV of the telephone dialer. This selector contains a spring housing BÄ with a spring, not shown, which the arm Si? tries to keep in the rest position indicated in the drawing. This housing is provided with a toothing into which the series electromagnet AV engages with a pawl in order to rotate the housing in the direction of an arrow /; each pulse received from AV causes an advance of one tooth, with the arm BR shifting one of the ten contacts. The whole thing is held in its respective position by a counter pawl, which is driven by the coil Fi? can be excavated. J

A relay G controls the unit A and DM in such a way that it works continuously; since the time for the rise of the stop d is 12 seconds, the coil AV receives a no pulse every 12 seconds, so that the arm .Bi? has arrived at the "end ι minute to the contact piece P ₅ and at the end of 2 minutes to contact piece P _10. These contact pieces can control the coil Fi, which-is arm Pi? returned to its rest position. A coil E ₁ by the contact S _{1 is} controlled, the contact piece P _{5 is set} in action, likewise by a coil P, which is controlled by the contact S ₂ , the contact piece P ₁₀ .

The mode of action is as follows.

When receiving signals, the MN, A, DM and C unit functions as described above.

When a first line of 4 seconds is received, S _{1 is} closed, coil E is excited and switched off by its contact 50, while coil G is excited by contact 51.

The coil G holds through its contact 58

ίο the excitation of C, ie the standstill of the motor, upright. The coil G energizes the contact 62 through its contact 56 and feeds the control circuit of the relay A through its contact 57.

Under these conditions, A and DM function at the highest point on the path of stop d, ie after 12 seconds; contact 62 is closed; the coil AV receives an impulse and causes BR to be advanced by one step. The circle of A is interrupted by contact 3, stop d goes down; contact 2 is then closed, A is energized again, and DM performs a new stroke. The movement of A and DM continues as long as contact 57 is closed. Each time d goes up, contact 62 closes and advances BR one step; finally after five pulses, ie after 1 minute, the arm BR reaches the contact piece P ₅ , which causes the excitation of VR . VR opens its contact 60, the coils E and G come to rest, VR brings the retaining pawl, the arm BR returns to its rest position. For safety reasons, a contact 61 keeps the excitation of Fi? upright until the rest of BR.

So you can see that G is from the reception

ίο remains energized for 4 seconds until BR has reached P ₃ , ie for 1 minute; during this time is the capacitor CT? shut down.

The coil F controlled by the contact S ₂ is identical to the coil E; through its contact 55 it connects the input of the relay VR to the contact piece P ₁₀ , and under these conditions, when the contact S _{2 is} closed, the coils G and C remain closed for 2 minutes.

The present invention is limited

naturally not on the illustrated exemplary embodiments. The automatic device can be used, for example, with a selector of any type

with a selector that responds to three letters, the first letter actuating contact S ₁ , the second actuating contact 6 * 2 and the third actuating contact S _s. In the arrangement according to Fig. 2, only a single motor need be used, in which case the motors MC, MM and MS are replaced by electrically operated clutches which couple the capacitor or the cams to the motor shaft.

Claims (5)

Patent claims: 1. Device for receiving wireless signals in which one or more variable elements of the receiving oscillation circuit are provided, which are in continuous motion and are automatically stopped by a signal, characterized in that this stop is only temporary, if there is one in the overcoated 'The recorded signal is of no interest, but it is final is under the action of a certain signal. 2. Device according to claim 1, characterized characterized in that the signal acts on a relay which stops the motor that controls the movement of the variable Element of the circle controls and at the same time the movement of a delay device triggers, which sets the motor in motion at the end of a certain time. 3. Device according to claim 1 or 2 in combination with a call or Alarm dialer with several selection steps, characterized by means of extension of stopping the variable element | tes in the case where the effect of the Signal during the first stopping time expires in an actuation of the voter. ' 4. Device according to claim 3, characterized in that the time of the additional arrest each time is longer than the previous time and that that Apparatus finally comes to a standstill when the voter has reached a predetermined dialing step. 5. Device according to claim 3 and 4, characterized in that the movement of the movable part takes place in one direction, such that a complete sweep of the selected Wave ranges is guaranteed. 1 sheet of drawings