Download MAGNUM 257 service manual & repair info for electronics experts. Congratulations on your purchase of a MAGNUM 257 10 meter FM/AM/SSB transceiver. Your MAGNUM is designed to provide years of enjoyment and trouble-free service. Owner's Manual (Courtesy of Drumwreck). ALIGNMENT PROCEDURES PLL Alignment · Transmitter Alignment · Receiver Alignment Alignment Locations. DIAGRAMS Note: OPTIMA V2 VERSUS MAGNUM 257HP BY A1 TELECOM USA Note: VERSION MAGNUM 257HP, BLUE LED, PHOTO FROM SIDE SERVICE MANUAL ENGLISH, $5.20.NOTE: The frequency mod for the 257HP is the same as for the Omegaforce S45HP. RADIO MODIFICATIONS Frequency Modification and Info Sheet. DIAGRAMS View and Download Magnum 257 operating manual online. 10 meter FM/SSB/AM transceiver. 257 transceiver pdf manual download.