SU921110A2 - Device for measuring telegraphy rate - Google Patents

Description

(54) DEVICE FOR MEASURING THE TELEGRAPHIC SPEED

one

The invention relates to a measuring technique and can be used in measuring radio engineering installations, as well as in simulators for training radio telegraphers.

According to the main author. St. No. 762209, a known device for measuring the speed of wiring, comprising a pulse shaper; the output of which through the differentiating unit is connected to the anode of the first diode, the cathode of which is connected to the first inputs of the controlling and triggering triggers, the output of the triggering trigger connected to the first input of the first key, the second input to the output of the pulse generator the key and the input of the first counter, the output of the last is connected to the first input of the first Decipher, the output of which is connected to the first input of the indicator, and the second indicator is connected to the output of the second decipher ora, a first input coupled to an output of the second counter, the second input of the control flip-flop with a unified to the anode of the second diode of which cathode is connected to the output of the differentiating unit, and an output control

the trigger is connected to the second input of the second key, the output of which is connected to the first inputs of the third and fourth keys, the second input of the third key is connected to the first output of the switching trigger, the output is connected to the input of the third counter, and the second input of the fourth key is connected to the second output of the switching trigger , output - with the input of the fourth counter and the comparison unit, the first input of which is connected to the output of the third counter, the second

10 input - with the output of the fourth counter, the third input is connected to the cathode of the first diode, the first output is connected to the counting input of the switching trigger, and the second output is connected to the input of the second counter and the second inputs of the first and second decoders, triggering and switching triggers 1.

However, the measurement accuracy in such a device is low.

The purpose of the invention is to improve accuracy 20

these measurements.

The goal is achieved by the fact that a third diode is inserted into the device for measuring the speed of wiring, the cathode of the third diode is connected to the counting input of the switching trigger, and the anode of the third diode is connected to the cathode of the first diode. FIG. 1 shows a block diagram of the device; in fig. 2 - diagrams explaining his work. This device for measuring the speed of wiring contains a pulse shaper, indicator 2, differentiating unit 3, first and second diodes 4 and 5, triggering trigger 6, controlling trigger 7, switching trigger 8, pulse generator 9, first switch 10, third diode 11, the second, third and fourth keys 12, 13 and 14, the third and fourth counters 15, 16, the comparison block 17, the first and second counters 18 and 19, the first and second decipherors 20 and 21. The device works as follows. The signals (Fig. 2a) from the telegraph source are fed to the input of the driver 1 pulses. The pulse former 1 generates positive pulses (Fig. 26), the duration of which is determined by the signal source. The pulses from the output of the pulse driver 1 are received at the INPUT of the differentiating unit 3, from the output of which pulses are removed (Fig. 2c). A positive pulse corresponding to the leading edge of the pulse from the driver 1 of the pulses, through the first diode 4, triggers the trigger 6 to the open state, controlling the triggering trigger 7 is in the closed state and changes the state of the switching trigger 8, affecting its counting input through the third diode 11, triggering the trigger 6, turned into the open state, opens the first key 10, through From which the pulses from the generator 9 of the pulses begin to flow into the first counter 18. Since at this time the pilot trigger 7 is in the closed state, the second key 12 is respectively closed, therefore the pulses from the output of the first key 10 through the second key 12 does not pass. The negative pulse corresponding to the falling edge of the pulse from the pulse former 1, from the output of differentiating unit 3, through the second diode 5 goes to the input of control trigger 7 and opens it. In this case, the second key 12 is opened accordingly. Suppose that the switching trigger 8 is in such a state that the third key 13 connected with it is open and the fourth key 14 is closed. In this case, the pulses from the pulse generator 9 begin to flow through the public keys 10, 12 and 13 to the input of the third counter 15, which remembers the number of pulses arriving at it. The next positive impulse from the output of differentiating unit 3 changes the state of only the control and switching triggers of 7 willows. At the same time, this impulse arrives at the control input of the comparator unit 17. Comparison unit 17 on this command compares the contents of the third and fourth counters 15 and 16. Since nothing is recorded in the fourth counter 16 yet, signals do not appear at the outputs of comparison unit 17. The control trigger 7 is transferred to the closed state, thereby stopping the passage of pulses through the second key 12. (The control trigger 7 operation diagram while - Switching trigger 8 under the action of a positive pulse changes its state again, opening the fourth key 14. The next negative pulse from pulse generator 1 again opens control trigger 7. This opens the second key 12 and the time stamp pulses through the public keys 10, 12 and 14 are fed to the input of the fourth counter 16, which The next positive pulse from the pulse generator 1 closes the control trigger 7, thereby closing the second key 12 and stopping the delivery of timestamp pulses to the fourth counter 16. At the same time, this pulse arrives at the control input of block 17 comparison, which by this command compares the contents of the counter that is filled last (in this case, it is the fourth counter 16) with the contents of another counter (the third counter 15). The following options are possible. The contents of counters 15 and 16 are slightly different from each other. Comparison unit 17 does not produce a pulse at its output. The contents of the counter, which is filled last, are more than 2.0-3 times higher than the content of another counter. This only corresponds to the pause between characters. In this case, from the first output of the comparison block 17, a positive pulse is removed, which is fed to the counting input of the switching trigger 8, which changes its state, thus opening the third key 13. It is also possible that the contents of the counter that fills the last 2.0-5 times smaller than the contents of another counter. In this case, the comparison unit 17 does not generate pulses. (In Fig. 2g - the pulse diagram is shown at the first output of the comparator block 17, and Fig. 2e and 2e show the pulse diagrams received, respectively, at the third and fourth counters 15 and 16). It is also possible that the contents of the counter that is filling the last one will be 4-5 times larger than the contents of another counter. This corresponds to a pause between the groups of characters. In this case, a pulse is output from the second output of the comparator 17, which is fed to the input of the second counter 19, the control inputs of the descramblers 20 and 21, and the second inputs of the triggering and switching triggers 6 and 8. (The pulse diagram from the second output of the comparator 17 is shown in FIG. . 2h). At the same time, all the pulses from the second output of the comparator block 17 are summed up in the second counter 19, each time with the appearance of a pulse at the second output of the comparator block 17, which meets the conditions for transmitting a group of characters, information from the counters 18 and 19 through the decoders 20 and 21 enters the indicator, which displays information about the number of transferred groups and elapsed time. At the same time, the same signal brings the triggering trigger 6 and the switching trigger 8 to the initial state, preparing the device for further work.

The use of this device in radio measurement equipment and simulators will allow better control over the operation of radio telegraphists for transmission during the training period, the conduct of competition

control standards by providing automatic control and determining the speed of wiring according to the number of transmitted groups per minute without attracting the attention of the subject.

Claims (1)

Invention Formula Device for measuring the speed of wiring aut. St. No. 762209, characterized in that, in order to improve measurement accuracy, a third diode is inserted, the cathode of the third diode is connected to the counting input of a switching trigger, and the anode of the third diode is connected to the cathode of the first diode. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 762209, cl. H 04 L 11/08, 1978 (prototype). V // 17 fpi / hL Kk kk to N T Y Y t to to P I MININ IIIIIIIIIIIIII NIN K k n p g IIIIIIIIIIIIIIIIIIIIII