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In amateur work, what is the surface error upper limit you should try not to exceed on a parabolic reflector?
0.1 lambda
Surface imperfections on a parabolic dish scatter RF energy and reduce gain. A common rule of thumb is that RMS surface errors should not exceed about λ/16 to λ/20 (0.0625λ to 0.05λ) for good performance. 0.1λ is a more lenient upper limit.
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