MT-550
57
TRANSMITTER
Power Output:
25 Watts or 1 Watt switchable.
Tx Current:
6 Amps @ 25W Tx.
1 Amp @ 1W Tx.
Modulation:
G3E for Voice, G3B for DSC Data.
Transmit Frequencies:
156.025Mhz - 157.425Mhz @ 25Khz spacing.
Spurious/Harmonic Emissions:
Less than 0.25µW.
Modulation Distortion:
Less than 4% @ 1Khz for +/-3Khz deviation.
Modulation Limiter:
+/-5Khz deviation with 100% modulation.
Frequency Response:
M6dB/Octave slope 1/-3dB
from 300 to 2500Hz.
18dB/Octave beyond 3000Hz. Audio Low
Pass Filter is included.
Hum & Noise:
Less than -40dB.
RECEIVER
Receive Frequencies:
156.300Mhz - 162.000Mhz @ 25Khz spacing.
Sensitivity:
0.5µV or less for 20dB SINAD
Squelch Range:
0.25µV to 0.80µV @ full squelch
Audio Output Power:
3.0W minimum @ 4 Ohms with less than 10%
distortion.
Receiver Current:
300mA in Standby.
Modulation Acceptance:
+/-7 kHz minimum.
Adjacent Channel Selectivity:
Less than -70dB for +/-25Khz.
Image Rejection:
Less than -70dB.
Intermodulation Spurious
Response:
Less
than
-70dB.
Noise Level:
Less than -40dB unsquelched.
Audio Frequency Response:
Matches -6dB/Octave slope within +1/-3dB
from 300 to 2500Hz, 18dB/Octave over
3000Hz.
RECEIVER (for AIS)
Receive Frequencies:
161.975Mhz (AIS1) and 162.025Mhz (AIS2).
Sensitivity:
1µV
or
less.
Image & Spurious Rejection:
Less than -70dB.
Local Oscillator Mode:
PLL.
