Icom IC-M56 [20/24] Tech talk from icom

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6 MAINTENANCE 6 4 BACKUP BATTERY The built in lithium battery retains the information pro grammed into the memory channels The life of the lithium battery is approximately five years If the battery is exhausted the transceiver operates normally but the information in the memory channels is not retained Tech Talk from Icom Q How far does a signal reach when transmitted over a sea or lake A For practical purposes there is very little signal propagation beyond the line of sight range when using VHF frequencies NOTE Backup battery replacement MUST be done by an authorized Icom Dealer or Icom Service Center 6 5 CLEANING If the transceiver becomes dusty or dirty wipe it clean with a dry soft cloth AVOID the use of strong chemical agents such as benzine or alcohol as they may damage the transceiver s surfaces In theory the distance of possible communication between 2 stations is obtained using the following formula D nm 1 22 x hT GTT D Distance hi h2 Antenna height ft For instance where hi 8 ft and h2 8 ft the distance is D nm 1 22 x J 8 Approx 7 nm Approx 8 miles TYPICAL APPLICATION Depending on weather conditions and your location some signals may not reach 8 miles and others may extend beyond 8 miles 16

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