I believe I have seen discussion of GF-* equipment here. On the bay: 110900199698 * * * * * * * * * * * * 73 - Mac, K2GKK/5 * * (Since 30 Nov 53) * * k2gkk at hotmail.com * * Oklahoma City, OK * * USAF, Ret (61-81) * * * * * * * * * * * *