Typically 1st IF at 45.000 MHz (high-order roofing filter) and 2nd IF at 455 kHz (narrow-band filtering). Sensitivity: J3E/F1B: Less than 2.5 µV for a 20 dB SINAD signal. Selectivity: Voice (J3E): 2.4 kHz at -6 dB. Data/DSC (F1B/J2B): 300 Hz at -6 dB. 2. Modular Architecture and Board Layouts
: Engineered to perform reliably in temperatures ranging from -15°C to +55°C and up to 95% humidity. 2. Structural Overview & Internal Circuitry samyung srg 1150 service manual 19
Because GMDSS functionality relies on non-stop digital listening, the manual isolates the circuit pathways of the dedicated . This specialized board features sharp intermediate frequency (IF) filters at 49.455 MHz and 455 kHz to pick out weak digital transmissions among heavy sea-static. Troubleshooting Core GMDSS Failures Typically 1st IF at 45