SOUTHERN AVIONICS COMPANY
Model SA100 Dual
1-3
Introduction
1.2 Specifications: SA100
QUALIFICATIONS: Meets applicable requirements of ICAO, FCC, and FAA.
FREQUENCY: 190-535 KHz, crystal controlled synthesizer, switch selectable in 500 Hz
increments, stability better than .005% (-40 degrees C to +70 degrees C).
POWER OUTPUT: Carrier power into 50 Ohms continuously adjustable 25 to 100 Watts, (100-
400 W PEP).
SPURIOUS EMISSION: Radiated harmonics (measured at a dummy antenna) are more than 63
dB below the 100 watt carrier.
TYPE OF EMISSION: NON, A2A, A3E (Optional), GID (with optional GPS beacon modulator, or
any combination.
MODULATION: Switching modulator/regulator provides high level modulation 0-95 percent.
Internal 400 Hz and 1020 Hz tone is selectable. Internal keyer normally operates at eight baud
(approximately 7 WPM) and is adjustable from 5 to 16 baud. In normal operation, carrier is on
continuously with keyed tone modulation. When voice modulation is used, the tone signal can be
adjusted to any level when voice signal is present. Voice input is at 600 ohms, -17 dBm nominal
signal level. Automatic gain control maintains a constant average modulation level. At maximum
sensitivity, voice input levels from -28 dBm to +5 dBm will cause negligible modulation
percentage change. Modulation is limited to 100% during severe overload of the automatic gain
control circuitry.
NOISE AND HUM LEVEL: More than 40 dB below the carrier level.
INPUT POWER: 115/230V ±15%, single phase 50-60 Hz. 24 VDC. Nominal input power is
180W at 100W carrier and tone keying at 95% modulation.
METERING: Power output, reflected power, PA voltage, PA current, percent modulation, audio
input level.
KEYER: The solid state keyer provides 95 DIP switch programmable dot spaces. A dot space is
adjustable from 63 to 166 ms. Special coding is available.
CIRCUIT PROTECTION: Individual fuses are used to protect the AC and DC circuits. VSWR
circuit that shuts down the transmitter if VSWR exceeds an adjustable value.
OPERATING CONDITIONS: continuous unattended operation in the following environments:
ambient temperature, -50 degrees C to +70 degrees C; relative humidity, 0-100%; non-
condensing; high salinity as encountered in offshore conditions.
MONITORING: Transmitter shuts down with loss of tone, drop in modulation below an
adjustable value, or continuous tone, or when power falls below an adjustable value, or when
VSWR rises above an adjustable value. With a dual system, a shutdown signal initiates a
transfer from the primary transmitter to the secondary transmitter.
AUDIO LINE INPUT: Balanced, 600 Ohms ±20%, -17 dBm nominal. Will accept -28 dBm to +5
dBm. (0 dBm=1 mW into 600 Ohms). Audio line direct current shall not exceed 3 mA DC.
Summary of Contents for SA100
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