Samyung Srg-150 Dn Service Manual [new] Jun 2026
INSTRUCTION MANUAL. Page 1. INSTRUCTION. MANUAL. MF/HF SSB. RADIO. EQUIPMENT. SRG-150DN/SRG-250DN. FCC Report
The "brains" of the device. It manages the frequency synthesizer (PLL), processes DSC data packets, interfaces with external GPS inputs (NMEA 0183), and controls the display unit. Peripheral Subsystems
50-Ohm non-inductive Dummy Load (minimum 200W continuous rating) Frequency Counter ( ±plus or minus 0.1 ppm accuracy) Oscilloscope (minimum 100 MHz bandwidth) Master Oscillator Alignment (Reference Clock)
Monitor the ALC voltage test point. Ensure the cooling fan activates during TX. Verify power supply voltage does not drop significantly under load. Samyung Srg-150 Dn Service Manual
Check the 24V DC input, cable connections, and main fuse on the power supply board.
: Use a digital multimeter to confirm that 24V DC (±15%) reaches the rear power terminal block under a heavy load.
Steps to calibrate the transmitter power, receiver sensitivity, and PLL (Phase Locked Loop) circuits. 3. Maintenance and Troubleshooting Guide INSTRUCTION MANUAL
Before calling a technician, many issues can be resolved with systematic checks. The manual's Chapter 13 provides a solid foundation, but here is a practical guide to some of the most frequently encountered problems:
: Incorporates intermediate frequencies of 64.455 MHz and 455 kHz . The manual details how the built-in DSP digital filter actively suppresses shipboard ambient noise.
Working on the Samyung SRG-150DN exposes technicians to dangerous high-frequency (RF) voltages and electrical currents. The service manual outlines strict safety guidelines: MANUAL
Broken control cable; Defective relays in SAN-150; Poor antenna grounding.
Never initiate a transmission while the antenna or ATU covers are removed, or when personnel are near the radiating element. High RF fields can cause severe tissue burns.
Adjusting the AGC (Automatic Gain Control) thresholds and RF gain stages. Section 4: Schematic Diagrams and PCB Layouts