[TrunkCom] historical EDACS question

[Michael W. Scheel]

At one time there was a very intensive network of G-MARC systems in 
Iowa. Mainly marketed to farmers and rural business. They were several 
still active here in eastern Iowa at least a couple of years ago. 
Davenport Iowa had a large one with five channels, But I can't remember 
hearing it in the last year. Some systems were only one or two channels.

The format has a very annoying tone superimposed on the audio which 
could be notched out with a filter. But you had to push scan after the 
audio dropped off. The entire conversation usually stayed on the same 
channel. G-Wiz board automated the sequence of notching and resuming the 
scan, but I never had one.

There are some models of mobiles that are dual-capable for EDACS and 
G-MARC. Not sure about any handhelds.

That exhausts my knowledge of G-MARC

Jeff Kenyon wrote:
> Hi everyone, I was just wondering a few things, and they have to do with
> EDACS.  When was the first EDACS system brought on line and where?  I also
> was wondering what was the old GE-MARK trunked format like, and are there
> still any GE-MARK systems out there?  I also was wondering about EDACS,
> and is it going out with OpenSky replacing many systems in the future?


-- 
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Michael W. Scheel  N0NGL  //  ARRL // DARC // MBRS // TAPR
Davenport IOWA      // RCMA IA-011 // IPMS/US #25517 QCSMS
personal website  -  http://www.n0ngl.net/
Quad-Cities (IA-IL) Scanning website - http://www.qcscan.com/
Quad-Cities Scale Modelers Society - http://www.qcsms.org/
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