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While I wouldn't pick LMR-400 for the mobile, RG58 might not be the first choice running any power either. Today's vehicles are very busy electronic environments and running low quality RG-58 at a couple hundred watts, parallel to any wiring harnesses or ECM could cause trouble. Increased opportunity for ignition noise to enter through poor shielding on coax too. There are good quality RG-58 cables available and even better alternatives still in that size cable.

If you have these problems in the mobile and coax leakage is not the problem, you may have a CMC issue on the coax. Guess what? Those RF ferrite beads that work on coax in the house, also stop CMC from coming back down the coax in the mobile. Everything from RF lip burns to mic feedback can go away placing one of them on the coax right at the antenna.

[QUOTE="Shockwave, post: 663807, member: 10882"] While I wouldn't pick LMR-400 for the mobile, RG58 might not be the first choice running any power either. Today's vehicles are very busy electronic environments and running low quality RG-58 at a couple hundred watts, parallel to any wiring harnesses or ECM could cause trouble. Increased opportunity for ignition noise to enter through poor shielding on coax too. There are good quality RG-58 cables available and even better alternatives still in that size cable. If you have these problems in the mobile and coax leakage is not the problem, you may have a CMC issue on the coax. Guess what? Those RF ferrite beads that work on coax in the house, also stop CMC from coming back down the coax in the mobile. Everything from RF lip burns to mic feedback can go away placing one of them on the coax right at the antenna. [/QUOTE]

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