Jamey,

The cm108 has a weak pullup and you must use a diode pointed out from the FOB to the radio COS. The radio side of the diode can pull it low. Since the diode blocks any positive voltage from going back into the FOB the high does not matter as long as it is above a couple of volts.

Make sure the low is really low on that radio. Also make sure the diode is good. You really should use a Schottky diode but you can get away with a good switching diode. With carrierfrom=usb you should be able to short the COS to ground and then briefly unground it and ground it again and see a hungup message in the client - 'asterisk -rvvv' - at the Linux prompt.

73 Doug
WA3DSP
http://www.crompton.com/hamradio

From: Jamey.Wright@morgan911.org
To: app_rpt-users@ohnosec.org
Date: Sun, 26 Jul 2015 22:36:50 +0000
Subject: [App_rpt-users] CM108 Fob Interfaces

I am using modified CM108 sound fobs on my system. I also use simpleusb and do not do DSP carrier detect. One of them has COR that is active low and it works no problem. The other one , the radio COR is only active high. The active high is 5V. In the simpleusb.conf I have it set for carrierfrom=usb but it doesn't work. Does the active COR voltage need to be more than 5V?

Thanks

Jamey
WR4JW

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