Tom, Forget about using the microphone connector on a CDM radio for any purpose other than connecting a microphone, handset, or programming cable. All of the radio status signals you might need are available at the rear accessory connector. Unless every programmable output pin is already being used, you can simply insert a contact in an open space in the existing accessory plug, and you're ready to rock. Pins 4, 8, 12, and 14 can be programmed in CPS to provide CSQ detect or PL and CSQ detect. I suggest using "PL and CSQ Detect" as the logic indicator for a valid signal. Just purchase the HLN9242A Accessory Connector Kit from Motorola Parts for about $5, and use one of the pre-terminated wires in the kit to insert into the existing accessory connector, and program that pin in CPS to do what you want.
Very important! The accessory pins on CDM radios have an oddball numbering, since they have 20 pins while MaxTrac, GM300, and similar radios have 16 pins. Rather than screw up the arrangement of the original 16 pins, Motorola simply added two pins to the left side and two pins to the right side. When you are facing the rear of the radio, the top row of pins are numbered left-to-right as follows: 20-2-4-6-8-10-12-14-16-18, and the bottom row of pins are numbered left-to-right as follows: 19-1-3-5-7-9-11-13-15-17. The HLN9242A plug has 16 contacts, and fits in the middle of the 20 pins on the radio. If pin 7 (logic ground) is already in use, just use chassis ground or the negative power lead as your logic return. 73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Thomas Oliver Sent: Sunday, November 30, 2008 7:06 AM To: [email protected] Subject: RE: [Repeater-Builder] Motorola CDM1250 COS Ok how about PL logic signal? tom ----- Original Message ----- From: Mike Mullarkey <mailto:[EMAIL PROTECTED]> To: [email protected] <mailto:[email protected]> Sent: 11/30/2008 7:05:27 AM Subject: RE: [Repeater-Builder] Motorola CDM1250 COS NO you will need to get is from the connector on the back. Colorado Telecom, L.L.C Mike Mullarkey 6886 Sage Ave Firestone, Co 80504 303-954-9695 Home 303-954-9693 Home Office & Fax 303-718-8052 Cellular ________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Thomas Oliver Sent: Saturday, November 29, 2008 10:25 PM To: [email protected] Subject: [Repeater-Builder] Motorola CDM1250 COS Does anyone know if COS signal is available at the mic jack on a CDM 1250 mobile radio? Rear accy jack is being used by other stuff. tom
