[App_rpt-users] RTCM COR CTCSS decode issues

Steve Agee n5zua at earthlink.net
Fri May 10 01:13:09 EDT 2013

All of my GM300 radios swing from 0 to +5 VDC for active high COS. Where are 
you getting 13.5 volts from?

Are you using some type of pull up line?


----- Original Message ----- 
From: Bill Hurlock
To: app_rpt-users at ohnosec.org
Sent: Thursday, May 09, 2013 8:04 PM
Subject: [App_rpt-users] RTCM COR CTCSS decode issues

I have just installed a GM300 for my transceiver and I configured it to put 
out TPL /DPL det on the accessory plug. Signal looks OK about 2.59 volts for 
low and 13.5 volts for HI. I can see this change correctly when I use TPL or 
when I don't. I set RTCM menu item line 12 external CTCSS to non-inverted. 
line13 External COR to 0 normal. The problem is audio passes into the system 
no matter if it has tpl tone on the incoming carrier or not. I can see the 
top green light (RX) on the RTCM module no matter if the carrier coming in 
has tone or not. I'm out of ideas on how to fix this. I want the RTCM to 
respond to the incoming CTCSS control line from the GM300. Any ideas on what 
is happening here?????

Bill Hurlock
856-234-1661 Office
856-264-1010 Cell

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