ON DEPARTING RAMP A BOARD WAS BLOWN INTO ANOTHER AIRPLANE.

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RAMP VERY CONGESTED. VERY TIGHT ON WINGTIP CLRNCS ON TAXI-IN AND TAXI-OUT. BEFORE ENG START I WENT DOWNSTAIRS TO SURVEY RAMP FOR SUFFICIENT TURN-OUT CLRNC; ABSENCE OF INTAKE FOREIGN OBJECT DAMAGE; AND A FACE-TO-FACE MEETING WITH RAMP PERSONNEL. I REQUESTED THEY REMOVE A TRUCK THAT WAS TOO CLOSE. I ALSO REQUESTED AND RECEIVED A 'RAMP-ALL- CLR' FROM OTZ OPS BEFORE START. DURING THE TURN-OUT FROM THE RAMP; THE L WINGTIP CLRNC BECAME A CONCERN DUE TO STACKS OF CARGO. I MAINTAINED FULL R DISPLACEMENT ON NOSEWHEEL STEERING UNTIL CLRNC ASSURED. STRAIGHTENED OUT TOO LATE FOR L TURN ONTO E RAMP. ROLLED OUT TO THE W. JET BLAST DAMAGE OCCURRED WHEN WOOD STRUCK AN ATX C-206 DAMAGING THE SPINNER AND THE LEADING EDGE OF THE WING. UPON NOTIFICATION OF DAMAGE (IN NOME) I SPOKE WITH OTZ OPS AND MY COMPANY'S DIRECTOR OF FLT CTL AND CHIEF PLT GIVING ALL DETAILS. I FILED THE REQUIRED COMPANY RPT AND EXPECT ATX TO SEND THE BILL FOR REPAIRS TO MY COMPANY. I HAVE HEARD OF SIMILAR INCIDENTS RECENTLY AT THIS ARPT. I HAVE DEPARTED THIS RAMP OVER 1 DOZEN TIMES WITHOUT ANY PROBS WITH JET BLAST. COMPANY PROC IS TO TURN R STRAIGHTEN OUT AND THEN TURN L TO E RAMP. THE COMPANY SAYS 'NEVER MAKE A 180 DEG TURN.' HOWEVER; CARGO WAS STACKED SO FAR OUT FROM THE TERMINAL (AND SO CLOSE-IN TO OUR ACFT) THAT I COULDN'T COMPLETE THE REQUIRED MANEUVER SAFELY. I INADVERTENTLY MADE A 180 DEG TURN AND SOME JET BLAST LIFTED A LOOSE PIECE OF WOOD AND SENT IT FLYING. I DID NOT CHK THE ATX RAMP FOR FOREIGN OBJECT DAMAGE; BECAUSE I WAS EXPECTING TO DO THE REQUIRED MANEUVER; NOT A '180.' THE STACKS OF FREIGHT DID NOT APPEAR TO BE A PROB DURING MY RAMP SURVEY; BUT IN THE TURN; WHICH DID NOT START WELL; THE STACKS LOOMED CLOSER. NO DAMAGE TO MY ACFT. NO ONE WAS INJURED. THIS RAMP IS FOR A B-737-200; NOT THE B-737-400 (MY ACFT). THE B-737-400 IS LONGER AND SLOWER TO TURN OUT. THERE IS NO ROOM FOR ERROR. I SHOULD HAVE HAD THEM MOVE THE CARGO TOO.