School radio center rush 1 30 200vt. We equip the school radio center. Mandatory link in the documentation

Volgograd State Pedagogical University Department of Theoretical Physics Radio Engineering Laboratory Laboratory work No. 9 School radio center RUSH - 1M. Volgograd, 1998 1 Laboratory work No. 9 School radio center RUSH-1M. Objective. Acquaintance with the device of the radio station RUSH - 1M, the rules of its operation, the main quality characteristics. The radio center of rural schools RUSH-1M is designed to provide sound for classrooms and provide two-way loudspeaker communication between the radio center operator and the subscriber. The radio center serves to amplify speech and music programs, notifications, musical accompaniment, etc. and allows, when generating and broadcasting programs, to produce a multilevel mixing of phonograms arriving at various inputs of the RUSH, including the imposition of voice-overs on them. The generated program is distributed selectively or simultaneously to subscribers connected to the external network using a switching device. The following can be used as input sources for each of the programs: 2 microphones, a turntable, a tape recorder, a broadcasting network and a radio receiver. The external view of the radio center is shown in Figure 1. Depending on the possible number of connected subscribers, it may include: 1 (for 15 subscribers), 2 (for 30 subscribers), or 3 blocks (for 45 subscribers), Fig.1. One of the blocks is basic (P-59) and is always used. The other two (P-60) are the same and are used to expand the operational capabilities of the RUSH. Each of the blocks includes a single-type amplifier path and switching devices, with the help of which up to 15 subscribers can be connected. Identical sets of possible input signal sources and the conditions for their use make it possible to form one of the equivalent programs in each of the blocks. Therefore, when using one block, subscribers can receive only one program (there is no path for forming others), with two - one of two, with three - one of three programs generated by the corresponding blocks. You; The selection of the program transmitted to the listener will be determined by pressing the button with its number from the group of interconnected buttons1 (Fig. 1) allocated on the switching device panel for this subscriber. Information sources are connected to the switchgear via connectors10 located on the back of the device. Each of them can be connected to the amplifying path using the corresponding key 2 (equipped with the input symbol) located on the front panel of the radio unit. The signal level and its relationship with other sources are set by ear using the control knobs 3 located above the keys. Here, each key has its own control, with the exception of the last three keys, when any of which is pressed, the level is set by the same control (,). Therefore, two microphones, a pickup and either a tape recorder or a radio receiver can be simultaneously connected to the amplifier with adjusting the level of their signals. Or a broadcast network. Knobs 4 are designed to adjust the tone of the sound at low and high frequencies and act simultaneously on all input signals. The power supply voltage of the unit is switched on by button 5 and is accompanied by light indication 6. On the panel of the switching device (front panel of the RUSH), each subscriber is assigned a group of 4 interconnected buttons 1 and a light indicator located nearby. The number of each button corresponds to the number of the program it commutes. The red "Connect" button allows, if the subscriber has an additional control panel, consisting of a loudspeaker and an operator call button 2 РУШ, to provide two-way communication with him. The subscriber is connected to the RUH for program transmission and communication through a switchgear connected to the unit using connectors. "Program" (11) and "Communication" (12) located on the rear panel. In addition, in the same place there are: "Ш12" interconnect connector (13); two fuses "2A" (14) for: protection of the amplifier output stage from overload and mains fuse; grounding terminal "body"; line-out socket (15) for connecting the P-60 unit. A distinctive feature of the P-59 base unit is the presence of paths for the formation of two-way loudspeaker communication between the operator and the subscriber. A conversation between them can take place only if this block is present, although the number of such subscribers connected by the "Connect" button from the corresponding group of buttons 1 can be increased using one (up to 30) or two P-60 blocks (up to 45). The loudspeaker formation unit includes a control loudspeaker, which, using a group of buttons 7, can be connected to listen to any of the three programs, or by pressing the red "Communication" button it is switched to the communication mode with the subscriber. The subscriber is called by voice. Knob 8 allows you to set the required volume level, and button 9 controls the direction of the conversation. When pressed, the control loudspeaker P-59 starts to be used as a microphone. By speaking into it, you can send a message to the subscriber. When the button is released, the P-59 loudspeaker is used to receive information from the subscriber, the loudspeaker of the communication console of which is now switched to the microphone mode. Thus, the direction of the conversation can be controlled only from the P-59 remote control. The number of correspondents simultaneously connected via a switching device for a conversation should not exceed two. If the initiator of the conversation is the subscriber, then to call the operator of the radio center, he must press the button on his communication panel. At the same time, the corresponding light indicator on the front panel of the RUCH turns on and the bell rings. The "bell" toggle switch located on the rear panel of the P-59 allows turning off the sound signaling of a call by the operator's subscriber. The presence in the same place of the "magnetic record" socket (16) - is intended for connecting a tape recorder in order to record (if necessary) the text of the conversation. When using simultaneously 2 or 3 RUSH units (P-59 and P-60 units), they are connected to each other using the Sh-12 connector. Each of the blocks must be connected to a 220V AC network, and the sources of formation of one (for each of its own) programs must be connected to its inputs. The distribution of programs to subscribers is made by pressing buttons 1 on the corresponding section of the switching panel. It should be remembered that the number of simultaneously pressed buttons of each program should not exceed 15. This is limited by the maximum output power of the amplifying circuit of the program. If necessary, the number of simultaneously connected subscribers can be increased if two, or all three blocks are given for the amplification of one program. In this case, external sources of the program are connected to one block, and the generated program is transferred to the subsequent ones by connecting the "line-out" socket of this block with the tape recorder or the input of the radio receiver of another block. Then, on the first block (P-59), the subscribers are switched on with the button 1, on the second -2, on the third -3. 3 Technical characteristics of RUSH-1M. 1. The amplifier section of the P-59 console and the P-60 units has 2 outputs: the main one with a rated power of 20W (30V at a load of 45 Ohm) and a linear output with an output voltage of 250 ± 50 mV at a load of 10 kOhm. 2. The communication path of the P-59 control panel has a rated output power of 0.25W at a load of 8 Ohm. 3. The frequency range of the amplifying path is from 80 Hz to 12500 Hz with uneven frequency response no more than 6 dB at zero positions of the tone control. 4. The communication path of the P-59 console has a frequency range from 300 to 6000 Hz with a frequency response drop of 7 ± 3 dB at the beginning of the range. 5. Regulators of timbres of low and high frequencies provide smooth adjustment of the frequency response within 16 dB at frequencies of 100Hz and 1000Hz. 6. Harmonic coefficient: In the amplifying path no more than 3% Through the communication path no more than 5% in the entire frequency range at rated power. 7. The P -59 console and each P-60 unit have 6 inputs for connecting signal sources: a) two microphone inputs with a nominal input voltage of 1 mV and an input impedance of at least 1 kOhm; b) input of a turntable with a rated voltage of 250 mV with a resistance of at least 500 kOhm; c) the input of a tape recorder with a nominal input voltage of 250 mV at an input resistance of 10 kOhm; d) a radio receiver input with a nominal input voltage of 250 mV and an input impedance of 10 kOhm; e) translation input with a nominal input voltage of 10V with an input impedance of at least 6 kOhm. 8. Interference voltage at the amplifier output: along the amplifier path no more than 300 mV, along the communication path no more than 14 mV. 9. The radio center has a “magn. recording "with a voltage of 250 mV at a load of 1 kOhm. 10. Power is supplied from the AC 220 V, 50 Hz. Main characteristics of amplifying devices As already mentioned, the main unit of the RFS is an audio frequency amplifier (UZCH), therefore the given main characteristics of the radio unit are determined by the corresponding indicators of UZCH. Let's consider them. 1. Nominal output power - the highest signal power released in the load, at which all the quality parameters of the amplifier are provided: U2 Pnom \u003d out.nom Rn 2. Maximum undistorted signal output power released in the load, at which it is not yet limited in amplitude. In any amplifier, the maximum possible voltage amplitude across the load is determined by the difference between the supply voltage of the arm (E n) and the residual voltage (U rest) of its output transistors. When the output oscillation reaches this 4 value (Fig. 2), a further increase in the signal does not lead to an increase in the amplitude U out, but only distorts the waveform. This is expressed in cutting off the half-waves of the sinusoid (Fig. 2). Therefore, the maximum undistorted output power is determined from the amplitude of the voltage across the load U out, measured at the cutoff edge, i.e., when the tops of the half-waves are not distorted, but the minimum addition of the input signal leads to the beginning of the cutoff. 3. Input sensitivity (Uin.nom) is the minimum value of the input signal at which the voltage at the amplifier output is equal to Uout.nom, and P \u003d Pnom. The value of U input is different for different amplifier inputs and is determined by the input signal source. 4. Voltage gain. U. K 0 \u003d out.nom U in.nom Usually, for ease of use, all indicators expressed in relative units are measured in decibels: U ⎞. N (dB) \u003d 20 lg⎛⎜ out.nom ⎟ U in.nom ⎠ ⎝ U It is useful to remember that out \u003d 1.12 is 1db; 1.26 - 2db; 1.41 - 3db; 2-6db; 3.16 U in 10dB; 10 - 20dB; 100 - 40db; etc. The widespread use of such a translation is associated with the simplicity of calculating the resulting values, because when multiplying indicators measured in relative units (for example, determining K of two or more amplifiers, frequency response, etc.), the values \u200b\u200bobtained for them in dB are simply added. 5. Amplitude-frequency characteristic of the amplifier (AFC) is the dependence of the modulus of the gain of the amplifier when the frequency of the amplified signal changes. In general, the frequency response can be complex, with ups and downs that characterize its unevenness, the boundaries of which are given in the technical specifications. The typical frequency response of the ultrasonic frequency response is usually monotonic and has a roll-off at both low and high frequencies. Unless otherwise specified by the bandwidth boundary, frequencies f n and f in are accepted, at which the gain drops to a level of 0.7 (3 dB) with respect to its value (K 0) at a frequency of 1 kHz (Fig. 3). In this case, the signal power in the load is halved. 5 Fig.3 When analyzing ultrasonic frequency it is more convenient to use the normalized frequency response, in which the K value K f is replaced by the value y \u003d f. Measurements are carried out with the K0 tone controls brought out. In real conditions, it is not the gain that is measured and calculated, but the output voltage proportional to it, obtained by changing the frequency of the input signal, the amplitude of which is maintained constant and such that the output voltage at an oscillation frequency of 1 kHz would be equal to ≈ 0.25U out.nom. If you use the logarithmic scale of the voltmeter for measurements, then the reading can be done directly in dB. 6. Immunity from integral interference. Each amplifier is characterized by its own noise level, and when powered from the mains, also by the background level. The noise includes fluctuation noise that appears as a result of chaotic thermal motion of carriers, shot effect, etc. Its presence can be detected by the characteristic hiss in loudspeakers and using an oscilloscope. The background level characterizes the interference with the mains frequency (50 Hz), which is induced through the supply and heating circuits. Both of these factors limit the minimum possible amplified signal. In measurements, to separate noise and background, an appropriate filter is used, in the absence of which the total level of influence of both factors is measured, called integral interference. In this case, instead of a generator, a resistor is connected to the input of the amplifier, the resistance of which is equal to the internal resistance of the signal source (for example, a microphone) and without supplying any input signal, the value of the resulting voltage across the load (U out noise) is measured. Integral interference immunity ⎛U ⎞ N int.noise \u003d 20 lg⎜ out.nom ⎟. U out.noise ⎠ ⎝ 7. Dynamic range of the amplifier. (D) - shows the ratio of the maximum and minimum amplitudes of oscillations amplified by the amplifier without 6 loss of information. The maximum possible amplitude, as already discussed above, is limited by the cutoff of the output signal. The minimum possible should be 2-3 times the value of the internal noise, so that the masking effect of the latter was weakened. Therefore, the dynamic range can be determined by the formula: ⎛U ⎞ D \u003d 20 lg⎜ out. max ⎟ - 10dB. U out.noise ⎠ ⎝ Measurements by p.p. 1-4, 6, 7 are carried out on a harmonic signal with a frequency of 1 kHz. 8. The coefficient of nonlinear distortion (K G) - is one of the most important indicators of the amplifier. It shows how many times the sum of the effective values \u200b\u200bof the higher harmonic voltages (distortion products) that appeared in the output signal of the amplifier due to the nonlinearity of its characteristics differs from the voltage of the signal itself that caused them. KG \u003d U 22 + U 32 + ... + U n2 100%. U1 Increased non-linear distortion is perceived by ear as the introduction of unusual coloring, hoarse and rattling sound. Measurements are carried out using a nonlinear distortion meter at a voltage across the load equal to U out.nom. over the entire range of amplified frequencies. 9. The input impedance of the amplifier is also regulated by the technical characteristics of the product. This is due to the fact that in some cases (when the program is received via broadcast lines) their coordination is necessary, which is achieved when the load resistance and the line impedance are equal. In others, it is required to reduce the shunt (load) effect of the amplifier input impedance on the input signal source. Therefore, information about the input impedances of the amplifier allows you to select the optimal operating mode of the device. ACOUSTIC FEEDBACK IN AMPLIFIERS. One of the features of amplifiers that use a microphone located in the same room as the amplified signal as an input source is the possibility of acoustic feedback. In any devices where the signal applied to the input, having passed through the amplification channel, can be returned to the same input, but with an amplitude not less than the initial one and coinciding with the input oscillation in phase, self-oscillations (self-excitation) occur. In a broadcast amplifier, such a feedback loop can be an acoustic path that transmits the output signal, for example, from a monitor speaker to a microphone input due to reflection from walls, surfaces of equipment, furniture. This is audibly manifested in the form of a loud whistle and howl. To eliminate self-excitation, you can reduce the gain of the amplifier control circuit, turn the volume control knob, or change the position of the microphone relative to the loudspeaker, for example, by turning it with the back side or increasing the distance between them, and also protect it with sound-absorbing material. When installing a sound amplifying device, the microphone and the loudspeaker tend to be separated as far as possible from each other, orienting them so that the sensitivity of the microphone in the direction of the loudspeaker is minimal. And the loudspeakers themselves should not be aimed at reflective surfaces. 7 EXPERIMENTAL Safety Notes. When working with the radio unit, it must be remembered that it is included in the 220V AC network. Therefore, the RUCH case must be grounded, and the fuses can be changed only when the power cord is unplugged. Description of the laboratory model. The model uses a complete set of RUSH1M. Connected to the switchgear are: a 45 Ohm resistor simulating the simultaneous switching on of all 15 subscribers of the P-59 unit, and two subscriber loudspeakers connected using sockets. On the switching panel RUCH, the line for switching on the resistor is designated Rн, and the subscriber loudspeakers 1 and 2. When Rн is connected, the amplifier of the radio node is loaded to the maximum load; connecting the loudspeakers recreates the conditions for the listener to receive the program. Sockets 1-2 and 3-4 connected in parallel to each other are designed for simultaneous measurement of the output voltage with a voltmeter and observation of its shape with an oscilloscope. JOB 1. Set the knobs for adjusting the levels of program sources (3) to the extreme left position. Connect the output of the radio receiver to the input of the RUH “receiving” ... Turn on the power of the radio unit and receiver. Using the button from the group and turn on button 7, connect the control loudspeaker of the P-59 unit to control the first program. Knob 8 and set the desired listening volume. Tune the radio to one of the broadcast stations. Switch off the monitor loudspeaker. Broadcast to subscribers 1 and 2. TASK 2. Turn off the radio with the button. Connect a microphone to the “microphone” jack. Press the corresponding button on the front panel of the RUCH. Make a broadcast by setting the required level with the regulator. TASK 3. Turn on the button and make sure that it is possible to overlay the narration on the broadcast program. turn off the radio. Disconnect the subscriber TASK 4. Use the loudspeaker button and connect a 45 ohm resistor. Turn the knob to the extreme right position. Switch on the monitor loudspeaker. Check for acoustic feedback and self-excitation. By changing the gain with the knob 8, and then the location of the microphone, to eliminate self-excitation. Mute the microphone with the button. TASK 5. Connect a pickup to the RUCH electrophone "Russia - 323" to play the gramophone. To do this, connect the "recording tape recorder" connector of the electrophone with the red wire to the connector of the upper RUH unit (P-60). In this case, the electrophone is used as the source of the 3rd program. Switch on the microphone. Set the rotational speed switch of the plates to the position corresponding to the frequency indicated on the plate. Place the record on the disc. Place the stylus over the recording start button. Turn on the plate rotation by moving the handle marked in the direction of the arrow. achieve the desired playback volume. Switching by adjusting the knob buttons of the 1st and 3rd programs, make sure that any of the programs can be transmitted to subscribers 1 and 2. Stop the player by moving the auto-stop knob in the direction of the arrow. Turn off the microphone. TASK 6. Disconnect subscriber 1, subscriber 2 is broadcast the 1st program. Prepare and carry out a conversation between subscriber 2 and the operator of the radio center using the 8 communication panel. By pressing the call button on the subscriber's communication panel, call the RUH operator. After turning on the subscriber's indicator light on the RUCH, press the "communication" buttons both for him and for the RUH operator (7). In this case, the control panel of subscriber 2 is connected to the P-59 loudspeaker path. Pressing and releasing the button (9) "communication", conduct a conversation with the subscriber. Make sure this conversation doesn't interrupt the broadcast. TASK 7. Carry out the strengthening of one program with all RUSH blocks. To do this, connect the Lin. output "block P-59 with the tape input of the next block (P-60) and turn on the button on it. In turn," Lin. connect the output of this block to the tape input of the 3rd block RUSH (P-60), while disconnecting the "Russia" microphone from it. Switching the program commutation buttons for subscribers 1 and 2 make sure that the first program is broadcast when the button of any program is pressed. CONTROL QUESTIONS: 1. What is the number and purpose of the blocks that make up the RUSH? 2. How many programs are amplified and how many are commutated by one block? 3. What can be used as sources of forming a broadcast program in the RUSH? 4. How many input sources can be simultaneously 5. How to distribute programs to subscribers? 6. What is the maximum number of subscribers simultaneously connected to broadcast one program, and what needs to be done to increase them? 7. What is the difference between the P-59 block from the P-60 unit? 8. How is the two-way speaking communication between the subscriber and the radio center operator carried out? 9. What is the maximum but the possible number of communication consoles connected at the same time for conversation? 10. What are the causes of acoustic self-excitation in the RSS? 11. What are the main quality indicators of RUSH? 12. What is the difference between the nominal and maximum output power of the amplifier? 13. How are the input sensitivity and voltage gain of an amplifier determined? 14. Amplitude-frequency characteristic of the amplifier and how to measure it? 15. What causes the amplifier's own noise and hum? 16. What limits the amplifier's dynamic range? 17. What characterizes the coefficient of nonlinear distortion? REFERENCES 1. RUSH -1M. Technical description and instruction manual. 2. Ostapenko GS Amplifying devices. - M: Radio and communication. 1989. 3. Glukhov A.A. Zorin I.F., Nikonov A.V. Measurement and control in the channels of sound broadcasting. -M .: Radio and communication ,. 1984. 4. Radio broadcasting and electroacoustics / edited by M.V. Gitlitsa. -M .: Radio and communication, 1989.9

Additionally, it is possible to connect:

For a small room (classroom, small office) one loudspeaker with a power of 0.25-1 W is enough. (Zenith 305 or 1GRN300)

For corridors, more powerful loudspeakers with a power of 2-3 W (6GRN310) are needed. At the same time, they will have to be hung along the length of the corridor (along the walls or ceiling) at a distance of 8-10 m.

In the dining room, the gym, two 10 W loudspeakers (10GRN321) will be enough. Without going into details, it is better - 10 pcs. 2 W. In the assembly hall, it is desirable to increase their power to 25 W (25KZ22).

Functionality

In addition to the functional capabilities of the school radio center RUSH 5 RU, the radio center RUSH 7 RU has additional options:

• addressing of amplified signals in eight transmission lines (loops), as well as transmission through all lines of emergency information from the remote control (telephone set);
• analog indicator of output signal level and load current, as well as built-in monitoring loudspeaker.

Amplification, frequency processing, mixing of an audio signal from a microphone, universal and line input.

Possibility of priority control and transmission of voice messages from a remote (up to 500 m) console of the PS 9 type.

Transmission of a musical ringing signal (gong) on \u200b\u200boutput lines.

Effective protection against short circuits on the output of amplifiers with automatic line testing.

Possibility of switching output lines and connecting a monitoring loudspeaker.

Built-in limiter, provides overload protection for the input signal.

A distinctive feature of the RUSH series amplifiers is ease of operation and the absence of a fan for cooling.

Unpacking and Installation

Installation and work with the school radio center RUSH 7 RU will not cause you any difficulties. Please read this manual carefully to familiarize yourself with all functionality, correct installation and connection.

Unpack the devices carefully; do not throw away boxes or other packing materials. They may be needed if you need to transport it or contact service.

All components must be connected in accordance with the diagrams and figures given in the respective operating instructions. Compliance with these requirements guarantees reliable and long-term operation of the product.

RUSH 7. Front panel.

1. power switch;
2. POWER indicator. Indicates that the amplifier is connected to the network.
3. Switches for transmission lines (loops). Provide separate on / off transmission lines.
4. LEVEL / LOAD switch. Switches the pointer indicator to the level of the output signal or load current.
5. Arrow indicator. Indicates the state of the output signal or load current in relative units
6. CHIME button. Turns on a two-tone beep.
7. Switches INPUT
8. Adjusts the sensitivity of the corresponding input.
9. Microphone input connectors.
10. Input sockets for connecting a tape recorder, CD-player or tuner.

RUSH 7. Rear panel.

The back panel contains:

1. Grounding terminal.
2. Volume switch for monitoring built-in loudspeaker.
3. Monitoring loudspeaker.
4. Connector for connecting a network cable.
5. Clamps for connecting transmission lines (loops).
6. Remote control connector (RC).
7. TFL connector. Designed to connect the RUSH-7 broadcast amplifier with a telephone line. The connection is made with the 0702 cable supplied by separate order.
8. LINE OUT connector. Serves for cascading amplifiers, as well as for control recording of the output signal.

RUSH 650 I. Front panel.

The front panel contains:

1. power switch;
2. pOWER button;
3. disc ejection button;
4. drive bay;
5. bAND (band) button;
6. panel RELEASE button;
7. preset memory buttons;
8. display;
9. port for USB and SD drives;
10. volume control and signal correction.

RUSH 650 I. Rear panel.

The back panel contains:

1. antenna connector;
2. output connectors 1, 2;
3. connector for connecting a power cord with a fuse socket;
4. ground terminal.

The figure shows a subscriber loudspeaker 6GRN310

Dynamic microphone MD 882 on a "gooseneck", holder in the tabletop, wind protection. Designed for use with RUSH mixer amplifiers.

Connection diagram

A radio center is not only the equipment of a low-power radio broadcasting unit of one-program (three-program) wire broadcasting and notification (OPV), but also, indirectly, loudspeakers (speakers, subscriber devices), including street cables, line cables, etc.

Radio center layout option, where:

1. Broadcast mixer amplifier;
2. Microphone;
3. Radio microphone;
4. Tuner, tape recorder, music center;
5. Program sources block;
6. Power supply 220 V (power cord);
7. Connecting cables (with a telephone line or a control panel, an additional broadcast amplifier);
8. Remote control (sometimes - an ordinary telephone);
9. Line-out for connecting additional translational amplifiers.

Installation of subscriber loudspeakers

When installing two or more subscriber loudspeakers in the same room or on the same site, the polarity of their connection must be observed.

Wall-mounted subscriber loudspeakers are preferably installed at a distance equal to the width of the corridor. If the width of the corridor is less than 5 m, then the subscriber loudspeakers are installed along the length, with a step of 6-8 m, avoiding corners.

If the width of the corridor is more than 5 m, the subscriber loudspeakers are located on opposite walls in a "checkerboard" pattern, with a step of 8-12 m.

Horn loudspeakers are placed so that crowded areas fall into the directional pattern.

When installing wall and horn loudspeakers, it is necessary to adhere to the rule: if you need to install several loudspeakers in the same area, it is better to install them in the center and point them in different directions, than to put them on the walls and point them towards the center. Legibility and quality in the latter case will be significantly worse.

What wire should be used for the transmission lines?

Any wire with a cross-section of at least 0.75 mm is suitable for internal wiring from the mixer-amplifier of the radio station to the loudspeakers. and an operating voltage of insulation of more than 120 V. Usually, an inexpensive domestic wire such as ШВВП 2x0.75 mm is used. For laying in cable wells on the street or when transmitting a signal over long distances, you can use a SHVVP 2x1.5 or PVS 2x1.5 wire.

Brief instruction

Do not connect the units to the mains before performing the presets. The units can be powered up after completing these steps. Make sure the mains power switches are in the off position.

Connect the cable 05-01 for connection, included in the delivery set, the output 1 of the block of program sources RUSH 650 I to the input connector 3 "Line input" of the translation amplifier RUSH 7.

Set all level controls of the RUSH 7 mixer-amplifier to the extreme left (counterclockwise) position "0".

Set the Treble and Bass controls to the middle position.

Connect the supplied antenna or an external FM antenna (recommended by the equipment manufacturer).

According to the figure given in the operating manual for the RUSH 7 mixer amplifier, connect the loudspeaker loops to the RUSH 7 mixer amplifier.

Attention! Loops with subscriber loudspeakers 1GRN300 and Zenit 305 to 30 V terminals.

Install one of the loudspeakers as a control loudspeaker directly in the radio center. We recommend installing the Zenit 305 subscriber loudspeaker as a "control" one.

According to the figure, connect a microphone (remote control for messaging - if necessary) to the input connector 1 "Microphone input".

Set the toggle switches of the inputs and transmission lines to the off position, and the input level controls to the extreme left position.

Connect the RUSH 650 I program source block and the RUSH 7 mixer amplifier to a 220 V network.

Before connecting the unit of sources of programs RUSH 650 I. Carefully study the enclosed operating instructions for the car radio.

Switch on the RUSH 650 I program source unit and the RUSH 7 mixer amplifier by pressing the “NETWORK” switches, while the neon indicators built into the switch should light up. Turn on the car radio.

Insert the CD for the CD player.

To operate the radio, tune in the desired radio station.

Set the required signal level (+40) with the radio volume control.

Set the "LEVEL" regulator to the extreme right position.

Give a signal to the control loudspeaker by turning on the corresponding LINE toggle switch.

Set the volume level you need with the corresponding “Input” control by turning the corresponding level control clockwise.

Give a signal to the loops by turning on the corresponding "LINES" toggle switch.

Attention! When a short circuit occurs in any loop, a protection circuit is triggered, disconnecting the amplifier from all outputs, and testing the presence of a short circuit in the loop with a frequency of 0.2 - 0.3 Hz. After disconnecting the emergency loop with the "LINES" toggle switch, the amplifier automatically restores the interrupted operation mode.

Working with the radio center

Sensitivity controls for microphone / line inputs "Inputs".
These regulators set the sensitivity of the corresponding inputs.

Treble tone control.
This control adjusts the level of the high-frequency component of the signal. The regulation range is ± 12 dB.

Bass tone control.
This control adjusts the level of the low-frequency component of the signal. The regulation range is ± 12 dB.

Output signal level control "Level".
This control adjusts the mix output level.

Remote control (RC) operation

A telephone set with push-button dialing and the obligatory presence of the FLASH function (with "tone" dialing) is used as a remote control.

The remote control is designed for remote auditory control of the broadcast signal and transmission of priority voice messages to the required broadcast lines (broadcast zones).

The remote control is connected to the RUSH 7 amplifier via a 2-wire unshielded line up to 1000 m long.

When you remove the handset from the device, auditory control of the current broadcast signal is performed.

After pressing any of the nine buttons ("1" - "9") control of the RUSH-7 amplifier is transferred to the remote control. Pressing the button ("1" - "8") corresponds to the number of the selected broadcast line to which the voice message is transmitted through the handset. By pressing the "9" button, the voice message is transmitted to all broadcast lines. When you press the "0" button, the remote control returns to its original state.

If a telephone line is connected to input 7 (Fig. RUCH 7. Rear panel.) Of the amplifier using a 0702 cable, the remote control can be used as a regular telephone set. In this case, to switch to the remote control mode on the telephone set, press the FLASH button, to return to the telephone communication mode, return the handset to the telephone set.

Main technical characteristics:

Source block of programs RUSH 650 I:

CD-player:

• Playable disc type - 12 cm (5 inches);
• Reproducible frequency band, Hz - 40-14000;

• Power consumed from the network by the block of sources of programs RUSH 650 AND 220 V, 50 Hz, VA, no more - 20;
• Overall dimensions of the block of sources of programs RUSH 650 I, mm - 215x93x300;
• Weight without packing of the unit of sources of programs RUSH 650 I, kg, no more - 5.0.

Broadcast mixer-amplifier RUSH 7:

• Rated output voltage, V - 30, 120;
• Nominal frequency range, Hz - 100 to 15,000;
• Unevenness of the amplitude-frequency characteristics in the nominal frequency range, dB, no more - 3;
• Total coefficient of nonlinear distortion in the operating frequency range,%, no more - 1.0;
• Maximum output power of the music signal, W, not less - 200;
• Power consumed from the mains supply 220 V, 50 Hz, VA, no more - 350;
• The number of connected lines (loops) - 8 + 8;
• Overall dimensions (2U), mm - 482x88x350;
• Weight without packaging, kg, no more - 8.9.

Wall loudspeaker with level control Zenith 305:

• Maximum power, W, not less - 0.25;
• Sensitivity, dB (1W / m) nbsp; - 88;
• Nominal reproducible frequency range, Hz - from 160 to 10,000;
• Dimensions, mm, no more - 173x172x73;
• Weight (without packaging), kg, no more - 0.8.

Wall loudspeaker 6GRN 310:

• Rated input voltage, V - 30;
• Maximum power, W, not less - 3;
• Sensitivity, dB (1W / m) nbsp; - 93;
• Nominal reproducible frequency range, Hz - from 100 to 12,500;
• Frequency unevenness of the sound pressure characteristic in the nominal frequency range, dB, no more - 16;
• Dimensions, mm, no more - 220x180x120;
• Weight (without packaging), kg, no more - 1.

Safety instructions

Be careful!

In the school radio center RUSH 7, a life-threatening voltage of 220 V.

To avoid accidents, it is strictly forbidden to operate the device with the covers removed and without grounding.

Take care of the safety of external connecting cables.

Protect the blocks of the school radio center RUSH 7 from mechanical shocks.

Do not place the school radio station RUCH 7 near pipes, batteries.

Do not install in confined spaces.

Do not use homemade fuses.

Carry out modernization and additional equipment of the radio center only with the official partners of the equipment manufacturer SKB "RA STR" with a mark in the warranty card. Design and technical characteristics are subject to change without notice.

In accordance with the Law of the Russian Federation “ On consumer protection"The service life (shelf life) of this product" after which it may pose a threat to the life, health of the consumer, harm his property or the environment "is seven (7) years from the date of production. This period is the time during which the consumer of this product can safely use it, subject to the instructions for use of this product, carrying out the necessary maintenance, including the replacement of consumables and / or appropriate repair support in a specialized service center of SKB "RA STR". Additional materials for this product supplied with this product may be stored for two (2) years from the date of manufacture.

The service life (shelf life), in addition to the shelf life of the additional materials mentioned in the previous two paragraphs, does not affect any other consumer rights, in particular, the warranty certificate of SKB "RA STR", which he can receive in accordance with the law on consumer rights or other laws associated with it.

Warranty obligations.

The manufacturer guarantees the compliance of the School radio center RUSH 7 with the technical requirements of ДЛЭ2.465332.014.7 ТУ, provided that the owner observes the operating rules set forth in the operating manual.

During the warranty period, the owner has the right to free repair of the School radio center RUSH 7 upon presentation of the warranty card.

Warranty obligations do not apply to the School radio center RUSH 7, which has signs of mechanical or other types of damage.

Warranty and post-warranty repairs are carried out by the manufacturer SKB "RA STR".

Attention!

Free repairs during the warranty period are made only with control seals (seals).

Carry out the modernization and additional equipment of the school radio center only at the official partners of the equipment manufacturer SKB "RA STR" with a mark in the warranty card.

In the absence of a mark from the official partner, free repairs are not performed.

Double guarantee after a week run at the stand of SKB "RA STR" for 36 months:

• manufacturer and supplier of SKB "RA STR";
• manufacturer of incoming blocks SKB "ISKRA".

Service life over 7 years.

"Lifetime" service support as "Copy Left".

Mandatory link in the documentation:

School radio center RUSH 7 RU (DLE2.465332.014.7 TU). Made in Russia. The manufacturer of the school radio center RUSH 7 is SKB "RA STR".

Documentation:

Notes:
- or mixer-amplifier translational

It is assumed that this project can be found in leading search engines (Google-Rambler-Aport!) by keywords:

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We can help you organize school radio broadcasting. The School Radio Center is a school broadcast system that broadcasts announcements and music. Also, the school music bell and the notification system are connected to the sound system of the school radio center.

School radio center - new opportunities

The technical equipment of the school radio center will allow for online broadcasting. You can also record voice information and announcements for their subsequent broadcast. You can create a compilation for broadcasting to specific broadcast areas: a sports ground area or a gym area.

We will think over a set for a school radio center for your tasks and offer our ideas. For example, on the basis of a school radio center, you can create school radio programs similar to corporate radio.

By the way, if you are thinking about a gift for a school, then audio equipment for a school or equipment for a school radio center may be one of the ideas for such a gift.

Which loudspeaker to choose for school

We recommend several models of broadcast loudspeakers for school broadcasting. Their choice is determined by the size of the sounding room and the preferred way of installing the speaker systems. We offer wall and ceiling speaker placement.

With the use of RUSH equipment, it is possible to build a radio center that allows information to be transmitted over ten broadcast zones.

It can be used in such areas of activity as wire broadcasting systems, public announcements, transmission of emergency messages, conference systems, as well as for servicing various public institutions (schools, trade enterprises, cultural centers, etc.). Broadcast amplifier RUSH-5M amplifies signals from various sources (microphone, tape recorder, tuner) with levels in accordance with GOST 24838-80, addresses amplified signals to four broadcast lines (loops), as well as transfers emergency information along all loops.

RUSH 5M (DLE3.465332.201.00 TU).

Made in Russia.

Designation on the diagrams:

Composition (delivery set):

1. Broadcast mixer-amplifier RUSH 5M, consisting of:

1.1. Translational mixer-amplifier RUSH 5M (DLE3.465332.201.00 TU) 1 pc.

1.2. ShS 0502 (DLE4.465332.200.00 TU) Power cord 1 pc.

1.3. Fuse 2A 1 pc.

2. Passport and warranty card 1 kt.

3. Packing container 1 pc.

The technical characteristics and parameters of the RUSH 5M electrical circuit correspond to the 1st quality class in accordance with GOST 11515-91.

RUSH 5M meets the requirements of TU (DLE3.465332.201.00 TU) and a set of design documentation (DLE3.465332.201).

Amplifier RUSH5M has three mixable inputs with separate level controls 1, 2, 3, bass and treble tone controls, an output level control, the ability to turn on four output lines, a telephone line input and a line output. The amplifier has the ability to send a chime signal.

Average power amplifier, 200/240 W, 4 inputs, 4 zones, 80-10000 Hz, built-in signal generator, weight 8.5 kg, dimensions 482x93x375 mm

Functionality.

Translational mixer amplifier RUSH 5M provides amplification of signals from various sources (microphone, tape recorder, tuner, PC, etc.) with levels in accordance with GOST 24838-80, addressing amplified signals to four broadcast lines (loops), as well as transmitting emergency information along all loops.

Translational mixer amplifier RUSH 5M has three mixable inputs with separate controllers of the signal level 1, 2, 3, controls for the tone of low and high frequencies, an output level control, the ability to turn on four output lines.

The amplifier has the ability to send a sound signal "gong".

Audio signals and joints at input and output RUSH 5M meet the requirements of the international standards IEC, ITU-R (CCIR) and ERUs for audio paths. This allows sharing RUSH 5M and any serial domestic and imported equipment. The mixer-amplifier can operate in a master-slave scheme with the aim of "increasing" the output power.

Diagram of connecting the load and devices to the RUCH 5M.

The figure shows the connection diagram of the load and devices to RUSH 5M.

Where:

RUSH 5M - broadcast mixer-amplifier - high-quality single-program broadcast mixer-amplifier
UK-2R - limiting box (universal box)
TAMU-10, TAMU-25S - subscriber unified broadcasting transformer
ShVVP 2x1.5, ShVVP 2x0.75 - the wire
KMM 2x0.35 - two-core microphone cable

Mixer Amplifier Operation in Master / Slave Mode

The "master / slave" mode is designed to increase the output power of radio nodes (in steps of 120/200 W) and the number of switched output lines (in steps of 4).The connection between the mixer-amplifiers is carried out with a standard cableSK 0501 (SK 0502).

Limiter

Very important! In order to weaken the effect of short circuits in subscriber radio wiring on the operation of the entire radio broadcasting network, it is advisable to equip each subscriber point with a limiter

It is worth noting that there is a vicious practice of connecting subscribers directly without restrictions. As a rule, this adds operational problems in the event of a short circuit at the subscriber's input or even when the subscriber removes the radio point (removing the transformer). The entire line turns out to be shorted, and it is not always easy to find such a short one, you have to sequentially disconnect the subscribers until the shorted wire is found.

The limiter is a device (resistor) that only passes the current necessary for the loudspeaker to function properly. For example, a universal box (plinth) can be used as a Limiter.

The limiter is installed at the very beginning of the subscriber wiring when it branches off from the common line. In the event of a short circuit or in case of accidental inclusion in the radio socket of an electrical appliance, the amount of current consumed by the subscriber point should have increased sharply. At the same time, the amount of current flowing to the rest of the subscribers would decrease and the volume of their transmission would fall. But the arrester, preventing too much current from passing through the field wiring, thereby facilitates the consequences of a short circuit.

Very important! Do not suppose the absence of restrictive boxes x in networks 100/120 V. This can lead to failure of the broadcast amplifiers of radio nodes, especially imported ones.

Technical characteristics of RUSH-5M

• Rated output voltage, V 30, 120
• Nominal frequency range, Hz 100 - 15000
• Unevenness of the amplitude-frequency characteristic in the nominal frequency range, dB, no more than 3
• Total harmonic distortion in the operating frequency range,%, no more than 1.0
• Continuous output power, W, not less than 200
• Power consumed from the supply network 220 V, 50 Hz, VA, no more than 350
• Number of connected lines (loops) 4
• Overall dimensions, mm. 482x88x350 (2U)
• Weight without packaging, kg, no more than 8.9
• Amplifier warranty period 12 months

Amplifiers RUSH