Is it permissible to wind two shielded audio cables on the same toroid? I'm running out of #31 toroids and want to fix RF pickup on the USB input of my sound card before I can get more. -- 73, Pete N4ZR Check out the Reverse Beacon Network at <http://reversebeacon.net>, now spotting RTTY activity worldwide. For spots, please use your favorite "retail" DX cluster.