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Color Codes?

arlo

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Dec 19, 2002
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What are inbound and outbound trbo color codes used for? It seems like they are always 1.
 

KevinC

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It's just another way to differentiate one group of radios from another so they talk with each other in the same color group, and not to other color groups.
Color codes are repeater specific, not radio group specific. Color codes are used to differentiate repeaters, talk groups differentiate groups of radios.
 

hp8920

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What's supposed to happen is adjacent repeaters on the same frequency should have different color codes, so that a transmission from a subscriber unit does not activate an unintended co-channel repeater.

Color codes come from colors in a map, where you want countries that touch to have different colors. The four color theorem says you can color any map with 4 different colors. If you want to be separated by two neighbors, you need 7.

PL tones act as color codes, and digital color codes were used as far back as AMPS analog cellular (on the control channels). 802.11ax Wi-Fi now has color codes.
 

KevinC

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What's supposed to happen is adjacent repeaters on the same frequency should have different color codes, so that a transmission from a subscriber unit does not activate an unintended co-channel repeater.

Color codes come from colors in a map, where you want countries that touch to have different colors. The four color theorem says you can color any map with 4 different colors. If you want to be separated by two neighbors, you need 7.

PL tones act as color codes, and digital color codes were used as far back as AMPS analog cellular (on the control channels). 802.11ax Wi-Fi now has color codes.
7 being a common reuse in cellular back in the day also.
 
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