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Looking for channel master feedhorn
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<blockquote data-quote="Channel Hopper" data-source="post: 1076338" data-attributes="member: 175144"><p>There is a guide to the distance that signals can travel down a circular waveguide, in order to be detected efficiently by a probe, though it is based on waveguide diameter, lower and upper frequency cutoff, and the end stop distance to the probe. In your case the differences of the throat length is less important as the match between the inner diameters at the flange.</p><p></p><p>You can easily eliminate the 'step' by adding the aluminium of a beer can inside, with some makes (K cider , in a black can being exceedingly thin) moulding themselves very well to the interior. Shrinking the diameter to a point that mimics the actual frequency you are having trouble receiving is worth carrying out on signals close to the background noise.</p><p></p><p>Take care as it is also razor sharp at the edges.</p></blockquote><p></p>
[QUOTE="Channel Hopper, post: 1076338, member: 175144"] There is a guide to the distance that signals can travel down a circular waveguide, in order to be detected efficiently by a probe, though it is based on waveguide diameter, lower and upper frequency cutoff, and the end stop distance to the probe. In your case the differences of the throat length is less important as the match between the inner diameters at the flange. You can easily eliminate the 'step' by adding the aluminium of a beer can inside, with some makes (K cider , in a black can being exceedingly thin) moulding themselves very well to the interior. Shrinking the diameter to a point that mimics the actual frequency you are having trouble receiving is worth carrying out on signals close to the background noise. Take care as it is also razor sharp at the edges. [/QUOTE]
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