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How to reduce range on HC-05 BT module to 3 feet only? Answered

I'm trying to design and build a rf shield to encase the hc-05 bluetooth module in order to reduce the range adjustably. For the first use I want to reduce the range to around 3 feet. Any tips?

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I don't know if you'll fry the board trying it, but remove the on board antenna would significantly reduce the range.