FTA-250L O perATing MAnuAL1212B efore you BegInExternal DC Power Supply ConnectionYou may insert the cable plug of the SDD-12 Ciga-rette Lighter DC/DC Converter into the EXT DC jacklocated on the right side of the transceiver.In this case, the “ ” icon will appear in the top rightcorner of the LCD display.When making DC connections via the SDD-12, beabsolutely certain to observe the proper voltage leveland polarity guidelines. The SDD-12 can be connected to 12 to 24 Volt DCpower sources.As closeas possible Ferrite CoreWind the cable one turn,then snap two halves.SDD-12Cigarette Lighter DC/DCConverter (12 to 24 Volts). For noise reduction from exogenous noise, windone turn of the SDD-12 cable around the ferritecore, and snap its two halves together, per the il-lustration above. Attach the ferrite core as close aspossible to the SDD-12 body, as shown.Do not connect any accessory unap-proved by YAESU to supply DC power;otherwise the FTA-250L may be damaged.Belt Clip InstallationYou may mount the belt clip to the rear of the FTA-250L using the supplied screws.