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Why does the Relic mode have a different audio signal tone to Coin and Coin/Jewellery modes?

April 26, 2017audio coin different JEWELLERY mode modes Relic signal Tone

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Why does the Relic mode have a different audio signal tone to Coin and Coin/Jewellery modes?

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The discrimination pattern of the Relic mode has a low rejection level. This is because relics can have low conductivity or ferrous content. This mode uses the ferrous content (of the target) to determine the pitch of the target signal, rather than its conductivity, which is used in the Coin and Coin/Jewellery modes.