The material contained in this document is the property of Electronics & Innovation Ltd., it is
subject to change without notice.
August 2012 Revision D
7
"1" key enables telemetry (readback similar to LCD display) - this is the default
mode at power up
“2” key clears any faults and tries to start the supply.
“0” key disables telemetry (Complement to “1” key)
Custom commands and display lists can be implemented upon customer
request.
Chapter 3 Technical Description
3.1 GENERAL DESCRIPTION
The 2500L is designed to amplify signals by 60 dB in the frequency band of 26
KHz to 12 MHz. The signal from the front panel N connector is fed via a length of
50 ohm coaxial cable into the input of the pre-amp splitter module. The signal
from the output of the splitter is coupled to the input drivers 1) - 4) the first stage
of each is the MMIC front end. The output signal of the MMIC is coupled to the
gate of transistor Q1. The further amplified signal appearing at the drain of Q1 is
coupled to the input of Q2. This is transformed to 50
and fed to the driver
output BNC port.
The driver output signal are fed through a length of coaxial cable to the input of a
power splitter, the outputs of this are fed to the power amplifier modules. In each
PA module the signal is split into two equal phase and amplitude signals. These
signals are fed to the inputs of transistors Q1 and Q2. The amplified signals
appearing at the drains of Q1 and Q2 are then fed to the output BNC port via the
impedance matching network. The output of the modules is then fed to a
combiner to produce a single signal.
The power signal is then fed into a length of 50 ohm coaxial cable to the RF bi-
directional coupler. The output of the coupler is then fed directly to the N
connector on the front panel, this is the unit output.
The forward and reverse coupled ports of the bi-directional coupler are fed to the
RF detector which is situated on the main control board. The RF detector feeds a
voltage, which is representative of the true RMS power to the control board
proper. The control board in turn drives the front panel display.
There are five switch mode power supply units four provide a 42 VDC 35 ampere
source. The other provides 24 VDC outputs and provides 10 amps. The main
power supply also has a 5 VDC output which feeds the control board.
