Make a tap in your trx at the last if . If you can downconvert it to 12khz there is a decoding software for this (dream)
I put a downmixer from 455 to 12khz in my icom 765 and now I can use that software for decoding drm It´s nice to hear a short- or mediumwavestation in stereo and noisefree like a local fm-station Also very nice on fieldday I listen to RTL on mediumwave in stereo very often (almost daily) The downmixer is just a few parts on a pcb as small as a stamp A mixer ic (sa612) and a few caps, and a ceramic-resonator that´s all with that 12khz if- output you can do a lot of other neat things there is many software out in the net for sdr and most of them can work with that 12khz-if (or are written for this) software like if-dsp (ik2czl), winrad, multipsk!, power-sdr, dream, to name just a few for receiving of drm you have to switch to am or fm on your trx you need that 10kc wide signal downconverted to the 12 khz if so your rig has to be set to that wide bandwidth the mystery signal is bbc / dw . The 2 stations are sharing the transmitting sites in sines portrugal and skeleton uk and sharing the qrg 3995 . You find lots of info here: http://www.drmrx.org/forum/ this is a listeners forum where receiving results , technical stuff and other things are posted so now you have much to read hi hi . Best 73´s de dg9bfc Sigi _____ Von: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] Im Auftrag von J. Moen Gesendet: Dienstag, 12. Januar 2010 05:49 An: digitalradio@yahoogroups.com Betreff: Re: [digitalradio] Mystery signal on 75M 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 <mailto:k...@earthlink.net> To: digitalradio@ <mailto:digitalradio@yahoogroups.com> 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 <http://en.wikipedia.org/wiki/Digital_Radio_Mondiale> .org/wiki/Digital_Radio_Mondiale Also see the complaints! http://www.mail- <http://www.mail-archive.com/hard-core...@hard-core-dx.com/msg06085.html> 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.radiowor <http://www.radioworld.com/article/8714> ld.com/article/8714 Cortland KA5S ----- Original Message ----- From: J. Moen <mailto:j...@jwmoen.com> To: digitalradio@ <mailto:digitalradio@yahoogroups.com> 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 <mailto:k...@earthlink.net> To: digitalradio@ <mailto:digitalradio@yahoogroups.com> 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. <mailto:jhhay...@earthlink.net> net> > To: <digitalradio@ <mailto:digitalradio@yahoogroups.com> 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. >
