eb104 430-440 MHz linear amplifier, User Manual, Page: 4 / 11

Functional Features of the Amplifier
The built-in potentiometers in the protection circuit and the BIAS voltage control circuit are
set to the correct position during setup and testing of the equipment. Any change in the
position of these potentiometers will result in the need to reconfigure the amplifier using
accurate measuring instruments.
Before operating the power amplifier, it is necessary to connect a load equivalent of 50
ohms, minimum 400 watts or a matched antenna with known low SWR to the output
antenna connector. The operation of the amplifier without load negatively affects the
operation of the output RF transistors.
To obtain an output power of 400 watts, the input power level should be no more than 8
watts.
The amplifier is designed for an impedance of 50 ohms. If the antenna-feeder devices are
matched to a resistance of 50 Ohms, and the SWR on all operating ranges does not
exceed the value of 1.5 to 1, then the amplifier can be operated without additional
coordination. If the SWR is greater than 1.5 to 1, then the use of additional matching
devices is recommended.
In the output stage of the power amplifier, a high-quality LDMOS transistor
BLP05H9S500P is used.
The process of switching the transmit-receive in the amplifier is provided by coaxial relays
controlled by a digital sequencer on the TINY13A microprocessor, which allows you to
control an external LNA, as well as control the transceiver by the TX INHBIT command.
The power amplifier is equipped with special high-speed protection circuits. For example,
from excess of output power, high value of SWR in the antenna, high drain current of
output transistors and overheating.
To control the operating parameters of the power amplifier, a digital measuring device is
used, on which the output power level and the SWR value are displayed.
Frequency range
Types of radiation
Input power
output power
Maximum SWR in the antenna
Supply voltage
Consumption current
Input impedance
Output impedance
Input / output connectors
Amplifier circuit
Output Stage Transistors
Dimensions - W x H x D (mm)
Weight (gr.) 430-440 MHz
SSB, CW, DIGI, RTTY ect.
6-8 watts
400 W
1.5: 1
30 ... 50V
15A max (50V each)
50 ohm (unbalanced)
50 ohm (unbalanced)
N-type
push-pull class AB
BLP05H9S500P
290x140x205
3900