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Knowledge Base:  
TYT TH-7800 CTCSS Tones and User CTCSS tones
Last Updated: 05/08/2017
Looking at the radio and those two columns, this is what is going on...

The radio has ONE CTCSS tone value in it's brain (Menu item 30). If you set this from the face of the radio, you access menu item 30 and select one of 50 standard CTCSS tones to be used for Encode and Decode depending on what type of tone is in use. The radio uses this one tone to access the repeater (tone) AND to block tones coming back from the repeater (Tone Squelch - TSQL).

This radio has an interesting feature that also involves Menu Item 30 that allows you to enter User Defined CTCSS tones or DCS codes via the microphone keypad. This allows for use of CTCSS tones that are not standard. These tones are used for BOTH encode AND decode in place of a standard tone for a repeater with a special setup. User CTCSS is deigned specifically for tones other than the standard 50.

In the programmer we reflect this same functionality using the CTCSS column and the User CTCSS column. Just as on the radio you adjust Menu item 30 eith by selection OR by typing in the value, the same is true in the program. You either select a standard value from the CTCSS column or you type in a unique value in the User CTCSS column.

In your file you have the same value in the CTCSS column AND the User CTCSS column. This is pointless. The radio will use only one of these for Menu Item 30. The program will set the value to that of the User CTCSS.

When you do a Get Data from Radio, the User CTCSS column is blank if it contained a standard CTCSS value. The standard values are displayed in the CTCSS column. There is nothing about the information that would tell the program to handle the standard as a special User CTCSS since it is not special.

Remember, the radio has only ONE CTCSS tone available for both encode and decode. It does not handle split tones.

Hope this helps get you going on this radio. Let us know if questions remain.

PS... you can verify this information on pages 25 and 28 of the User's manual for the radio. Notice that both reference Menu item 30.

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