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I use the same set up as stringscope (Fans exhausting out the rear of the scope) When things get damp at a star party, I',m usally one of the last to pack up. Unless you observe in severly cold conditions like I some times do, this works very well. I have a piece of surpluss nichrome heater wire coiled behind the secondary hooked up to 12V for backup, when temps get below freezing.
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