National Model XCU-50 100/1000 Kilocycle Crystal Calibrator Unit. In near mint condition for $150, plus shipping. Mike, W4UM (ex-K4KUZ) mraskin at attbi.com or w4um at arrl.net Florida Contest Group http://www.qsl.net/fcg/ South Florida DX Association http://www.qsl.net/k4fk/