The amplifier is designed to use on thrunk-lines for long and short distances.




-Duple GaAs technology “from input to output” allows to minimize the level of products of the second and third order, as well as to reduce the level of the amplifier’s own noises;

-The input equalizer is equipped with a frequency range switch (47-450 MHz, 47-900 MHz), which allows the user, after selecting the desired range, to obtain the maximum slope of the amplitude-frequency characteristic in this range;

-The built-in intercascade electronic attenuator and the amplitude-frequency characteristic correction allows to refuse additional, replaceable modules. The value of the interstage attenuator and corrector is tuned by the user in the range 0-10 dB;

The amplifier can be equipped with an automatic gain control (AGC) system operating on a pilot signal (439.25MHz or 295.25MHz) coming from the trunk. To do this, the receiver of the RC-02-2 pilot is installed in the connector on the baseboard. The receiver is tuned to one fixed frequency, the value of which can be changed in agreement with the customer.

Stability of the output level when using the AGC ± 0.7 dB;

The gain tuning depth is ± 4 dB;

The amplifier can be equipped with an automatic gain and slope control system (AGC and H), working on two pilot signals (lower – 109.75 MHz, upper – 21-69 TV channel). The number of the reference TV channel is programmed by the user himself. To operate the AGC and H system, a RC-03 pilot receiver is installed in the connector on the baseboard.


Stability of the output level when using the AGC system and H ± 0.7 dB;

The gain tuning depth is ± 4 dB;

The depth of the tuning of the slope of the AFC + 4 / -10 dB.

On the baseboard can be installed an additional amplifier of the return channel AR-03 with tuned gain, a correction of the slope of the amplitude-frequency characteristic and the possibility of remotely (from the studio) to include (turn off) the return channel in this amplifier;

The gain is 15 dB;

The maximum output level is 115 dB / μV;

The gain tuning range is 20 dB;

Tuning range of the AFC slope is 20 dB;


The microcontroller, located in the receivers of the pilot signal, acts as a modem. He controls the AGC (AGC and H) system and sends information about her work to the studio on the reverse channel. It is possible to connect various sensors to the microcontroller (for example, from the doors of switchboards, etc.), the triggering of which will be immediately reported to the studio;

The microcontroller measures the supply voltage at a given point in the trunk and transmits this information through the return channel to the studio;

Power amplifier from AC or DC;

Interchangeable inserts of the output divider with the following parameters:

4/4 dB, 6/2 dB, 8/2 dB, 10/1 dB, 12/1 dB, 16/1 dB, 18/1 dB;

By switching fuses, in the main power supply circuit, you can select the desired method of supplying the amplifier (from the input or from the output);

Control connectors on the input, output and in the return channel of the amplifier.

Input for power supply to the main through the amplifier (5A);

Protection of the input and output of the amplifier from high voltages;

Protection of the amplifier output stage from overload and unbalanced load;

Molded aluminum, hermetic housing.


Amplifier type WA-303D
Frequency range Main channel, MHz 47-450 / 900 (58-450 / 900,85-450 / 900)
Feedback channel, MHz 5-30 (5-42, 5-65)
Gain Main channel, MHz 37
Feedback channel, MHz 0 (15)
Unevenness  amplitude-frequency characteristic, dB ± 0.5
Max level of output signal (DIN45004B) IMD2 = -60dB, IMD3 = -60dB Main channel, dB / μV 126
Feedback channel, dB / μV 115
Limits of gain control, dB Input attenuator, dB 0-20
Limits for adjusting the slope of the amplitude-frequency characteristic, dB Interstate attenuator, dB 0-10
Input equalizer, dB 0-20
Interstate equalizer., dB 0-10
Coefficient of standing wave by the input (output) 1.4
Noise factor, dB < 6
Ability to install automatic adjustment units gain, slope amplitude-frequency characteristic

The attenuation coefficient at the control tap

By input, dB -20
By output, dB -30
Into feedback channel, dB -20
Unevenness amplitude-frequency characteristic control tap, dB ± 1
Power consumption, W 20
Supply, Hz 25-65В / 50
Maximum current of remote power supply, A 5
Connector type (input, output) 5/8″