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What is the difference between LMR400 and LMR600 cable?

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LMR600 is a thicker cable than the LMR400.
You typically use LMR400 when going runs from 5ft to 40ft.
Anything 50ft and above, you want to use LMR600.
Because the cables will add loss to your signal,
Using the thicker LMR600 will reduce the loss when reaching those longer cable lengths.