OK, I was thinking of the narrow bandwidth WinDRm and even better FDMDV that we used until it was discovered we were using a proprietary codec. DRM for HF broadcast really is pretty wide, comparatively. Thanks for the links.
Jim - K6JM ----- Original Message ----- From: Cortland Richmond To: digitalradio@yahoogroups.com Sent: Monday, January 11, 2010 7:55 PM Subject: Re: [digitalradio] Mystery signal on 75M Sure is. See the Wiki: http://en.wikipedia.org/wiki/Digital_Radio_Mondiale Also see the complaints! http://www.mail-archive.com/hard-core...@hard-core-dx.com/msg06085.html FWIW, we in the US still have some AM HD Radio stations on IBOC wiping out reception of adjacent frequencies. http://www.radioworld.com/article/8714 Cortland KA5S ----- Original Message ----- From: J. Moen To: digitalradio@yahoogroups.com Sent: 1/11/2010 10:41:14 PM Subject: Re: [digitalradio] Mystery signal on 75M Is DRM that wide? ----- Original Message ----- From: Cortland Richmond To: digitalradio@yahoogroups.com Sent: Monday, January 11, 2010 5:48 PM Subject: RE: [digitalradio] Mystery signal on 75M There's some European DRM broadcasting in that range. Cortland > [Original Message] > From: jhaynesatalumni <jhhay...@earthlink.net> > To: <digitalradio@yahoogroups.com> > Date: 1/11/2010 8:27:07 PM > Subject: [digitalradio] Mystery signal on 75M > > I was listening on the top end of 75M this afternoon about 4PM > CST and heard a strange wideband signal, sounded a little bit like > rushing wind. Brought up a digital waterfall and found that it > extended from 3990.15 to 3997.85. The waterfall display was rather > blotchy, suggesting some internal structure, tho I'm not clear on > how many carriers might be present or what their spacing is. > > I was beginning to suspect the neighbor's cable TV box which has > put noise on some other frequencies, but then the signal went away > about 5PM CST. I've heard the signal before, but didn't note > the times and spectrum. This is in NW Arkansas. >
