Operation Manual

4-9
Technical Description
4.4 SPECIFICATIONS
4.4.1 Transmitter
Channels All available US, International, and Canadian VHF
Marine Band
Frequency Stability +/- 10 PPM (+/- 0.001%) (-20°C to +50°C)
Frequency Range 156.025 to 157.425 MHz
Channel Spacing 25 kHz increments
Power Output 25 W switchable to 1W into 50 ohms at 13.6 VDC
Modulation Frequency modulated 16F3
(+/-4.5 kHz at 1000 Hz)
Mod. Audio Response Shall not vary +1/-3dB from true 6dB pre-emphasis
from 300 to 2500 Hz, reference 1000 Hz. Audio
frequencies 3-20 kHz shall be attenuated (at 1 kHz
by 60 log f/3 dB. Above 20 kHz by 50 dB)
FM Hum & Noise level Less than -40 dB below audio
Audio Distortion Less than 10 % at 1 kHz for 3 kHz deviation
Spurious & Hamonic Attenuated at least 43+10 log Po (below rated
radiated carrier Emissions power) per FCC Rules
Part 2 & 80
Antenna Impedance 50 ohms
Transmitter Protection Shall survive open or short circuit of antenna
system without damage (10 min. test)
4.4.2 Receiver
Channels All available US, International, and Canadian VHF
Marine Band
Frequency Range 156.025 to 163.275 MHz in 25 kHz increments
Frequency Stability +/- 10 PPM (+/- 0.001%) from -20°C to +50°C
Usable Sensitivity 0.35 µV for 12 dB (SINAD)
Squelch Sensitivity 0.2 µV or better
Threshold 1.0 µ full squelch
Adjacent CH Rejection 70 dB
Spurious Image Rejection 70 dB
Intermodulation Rejection 70 dB
Audio Output 2 watts or more at 10% or less distortion into 4
ohm load (internal)
Hum & Noise in Audio Less than -40 dB
RAY230_sect4.p65 7/13/2001, 1:43 PM9