Iowa Public Radio is buying a Des Moines FM translator that recently moved to a new frequency, giving it a third strong signal in the capital city. The deal filed with the FCC on Feb. 7 calls for IPR to buy K231DI/94.1 (Des Moines) from Youngers Colorado Broadcasting for $100,000. K231DI was formerly K295CB/106.9, which had relayed KXLQ/1490 (Indianola).