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4.4 SPECIFICATIONS
4.4.1 Transmitter
Channels 53 US/International
Frequency Stability ±10PPM (±0.001%)
(-20°C to +50°C)
Frequency Range 156.025 to 157.425 MHz
Channel Spacing 25 KHz Increments
Power Output 25 Watts switchable to 1 Watt into 50 Ohms at
13.6 Vdc
modulation Frequency modulated 16F3
(±4.5 KHz at 1000 Hz)
Modulation Audio Response
Shall not vary +1/-3 dB from true 6 dB pre-emphasis
from 300 to 2500 Hz, reference 1000 Hz. Audio
frequences 3-20 KHz shall be attenuated (at 1KHz by
60 log f/3 dB. Above 20 KHz by 50 dB)
FM Hum & Noise Level Greater than -40 dB below audio
Audio distortion Less than 10% at 1 KHz for ±3 KHz deviation
Spurious & harmonic Emissions Attenuated at least 43+10 log Po (below rated
radiated carrier power) per FCC Rules Parts 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 93 (includes 10 weather channels)
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 0.3µV for 12 dB (SINAD)
Squelch Sensitivity Threshold 0.2µV or better
1.0µV full squelch
Adjacent Chl Rejection Greater than 65 dB
Spurious Image Rejection Greater than 65 dB
Intermodulation Rejection Greater than 65 dB
Audio Output 3 Watt or more at 10% or less distortion into 4 Ohm
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Hum & Noise in Audio Less than -40 dB