de WB2CPN South Central Pennsylvania 2004.04.22 I don't think the stand-alone 375 or the 191 had any number except BC-375 or BC-191. We used a lot of the BC-191's as LF Aeronautical Beacons (200-400 KHz)because that's all we had, I guess. There were T-5/FRC or BC-329 LF transmitters but they were mostly used for AM voice. They wouldn't stand up to continuous duty at full power. 73 Clete