Sailor RE2100, Technical Manual

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1 GENERAL INFORMATION RE2100
EXCITER UNIT
This unit contains all necessary circuits to generate an SSB/AM signal in the frequency range from 1.6
- 30 MHz.
It starts with a compressor and AF amplifier.
The AF signal is fed to the balanced modulator to produce a double sideband signal on 10.73 MHz.
The DSB signal is fed to the LSB filter where only the lower sideband passes through. The LSB signal is
fed to a step attenuator, which is controlled from the microprocessor. From the step attenuator the signal
is fed to the first mixer, and the frequency is converted to 70 MHz. If 59.27 MHz LO-signal is used, the
signal will be lower sideband. If 80.73 MHz LOsignal is used, the signal will be upper sideband. From the
mixer the signal is fed to an amplifier, 70 MHz crystal filter and an amplifier. From the amplifier the signal
is fed to the second mixer which converts the frequency from 1.6 MHz to 30 MHz.
After the mixer a lower side signal is converted to an upper sideband signal, and an upper sideband signal
is converted to a lower sideband signal. The output of the mixer is fed to the power unit.
POWER UNIT
This unit contains the final amplifying and filtering of the RF signal, and produces all necessary supply
voltages for the modules in RE2100.
The signal from exciter unit is first amplified, then filtered in a 30 MHz lowpass filter and then amplified
to a level of approx. 2 mW.
The input voltages from T2130 is ±18V and 9V. These voltages passes through seven series regulators
to produce the necessary supply voltages to RE2100. A special ±15V for the exciter is controlled from the
microprocessor, so when the transmitter has not been used for two minutes, it is switched off to reduce
the power consumption in standby.
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