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MFJ-272 does not protect against a direct lightning hit
Hide the base by covering it with grass
It works with any relay voltage(AC
The antenna includes exclusive diecast aluminum
Low SWR lets your transceiver deliver full power safely
MFJ-4418, ADVANCE BATTERY VOLTAGE BOOSTER,13.8VDC, 25A Features_Pulsar MFJ-272 does not protect againstLike MFJ 4416C but has an on board microprocessor to give more intelligent features and protection. Power switch allows load to be isolated from input, protecting from over current voltage greater than 15V from boost supply or improper input. MFJ 4418 monitors input and will not turn on if it is not greater than 10V and less than 14. 5V. Programmable value enables or shuts down booster supply as needed. Allows auto operation without keying connections