2-1
2.1 General
The SSB transmitter/receiver (FS-1503) has been developed as an upgraded successor
model of FS-1550 and FS-1502, which is used for pleasure boats and fishing boats. The
specifications conform to the FCC regulations and the inspection standards of such
countries as New Zealand, Australia, Russia, China, and southeastern Asian countries.
This model features that it uses DDS circuit for the local oscillator to reduce the frequen-
cy switching time and thus enables telex communication. It has a built-in two-tone alarm
and is powered by a 13.6 V supply.
The transmitter works in 1.6 MHz to 23.0 MHz, 150 Wpep and in 23.0 MHz to 27.5
MHz, 75 Wpep with an automatic forced-air-cooling to PA section by FAN and the re-
ceiver works in 0.1 MHz to 29.9 MHz. The antenna coupler is automatically tuned to op-
erating frequencies and does not need matching operation. An optional dummy antenna
can be installed in the antenna coupler.
ITU channels are standard channels. In addition, there are 199 user-programmable chan-
nels and 65 station names among them can be displayed.
Chapter 2 Circuit Description
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