In the CPS when the RCS system in San Diego is programmed, on the trunking page under the Digital drop down you see Digital modulator type, how is it programmed,Wide,C4FM, CQPSK. Not sure what they mean. If anyone knows and has an explanation of them please post up.
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San Diego Trunking system
- Thread starter P25Radio
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slicerwizard
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Sounds like this belongs in the Motorola forum. Also, your system administrator should be able to help you with this.
Well this is the Trunking Forum.
From the CPS Help Files:
Digital Modulator Type (Trunking System, Digital)
Selects the Digital Modulator Type for the current Trunking System.
C4FM: Compatible 4-Level Frequency Modulation for non-simulcast operation
CQPSK: Compatible Quadrature Phase Shift Keying for narrowband simulcast operation.
Note: This function is available to radio models equipped with CAI (Common Air Interface) Digital Operation.
WIDE: Wideband simulcast operation
Note: Cannot be chosen if a Channel Bandwidth of 12.5 kHz is selected.
The factory default is "CQPSK" forASTRO25 Trunking
The factory default is "C4FM" for Type II Trunking
If you don't know which one to use, contact your System Administrator.
Digital Modulator Type (Trunking System, Digital)
Selects the Digital Modulator Type for the current Trunking System.
C4FM: Compatible 4-Level Frequency Modulation for non-simulcast operation
CQPSK: Compatible Quadrature Phase Shift Keying for narrowband simulcast operation.
Note: This function is available to radio models equipped with CAI (Common Air Interface) Digital Operation.
WIDE: Wideband simulcast operation
Note: Cannot be chosen if a Channel Bandwidth of 12.5 kHz is selected.
The factory default is "CQPSK" forASTRO25 Trunking
The factory default is "C4FM" for Type II Trunking
If you don't know which one to use, contact your System Administrator.
Thank you Mike, That helps a lot, not programming a trunking system just wanted to know what they stood for.
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