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General Electric's GMARC Trunked Radio System
In the early to mid 80's a network of trunked radio systems using the GMARC type was built in the upper Midwest. Marketed mainly to agri-businesses and farmers. While many sites still exist, it has been generally replaced by newer formats. Con-Net Erricsson does offer dual-format radios for GMARC & EDACS.
The main item about trying to listen to GMARC system. During a transmission there is a tone that is superimposed onto the signal audio. Making reception by a non-GMARC radio very annoying. Scanner Master offers a combination EDACS-GMARC tone blocker for scanners, which makes reception bearable.
I have little information about GMARC sites.
Site: Racom, West 13th Street, Davenport, Iowa
861.7875
862.7875
863.7875
864.7875
865.7875
Racom acquired this system when they bought Central States Communications .		 Site: Lectronics, Inc. Clinton, Iowa
861.8375
862.8375
863.8375
864.8375
865.8375
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page revised on November 28, 2002
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