Less than a year after TEN-TEC and Alpha Amplifiers merged under the RF Concepts banner, the companies have changed hands. RKR Designs LLC of Longmont, Colorado, announced on April 2 that it has acquired the two brands’ assets RF Concepts. RKR said it plans to expand the product line while “continuing to service their customers.” RKR Designs principals are Ken Long, N0QO, Richard Gall, and Rich…