Don't know what it goes to or if usable. Have a Hallicrafters board, P/N 129-001024. Has two apparent crystal filters, 049-000303, 304, I presume USB/LSB, made by Filtech. Is old, uses 2N2972 transistors. I see is missing a small capacitor. It's a plug in PC card. Anyone know what it is or want it? FTGH + postage. 73. Rod K0EQH