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Supercharged DX-RX-4K
Just kidding...
They were getting hot because of a terrible choice for installation location, but I thought it looked 'cool'

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We have pairs of them mounted vertically in a lectern that has about 1" space left over between the TX or RX and the inner shell without overheating.
"Screw you Louis - We got sales quotas to meet! The temperature is fine. Troubleshoot in the field."