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Satellite TV receivers & systems support forums
Fringe Reception General
Anyone tried to make BIG dish at home?
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<blockquote data-quote="Low Profile" data-source="post: 793583" data-attributes="member: 190036"><p>The rear element is λ/2 from the rear plate, so any reflected waves from the rear plate are in phase (effectively increasing the signal), the front element is λ/2 from the rear element so you have maximum deflection between the two elements (hence the diff amp). The 'beauty' of this is it is tuned to in-band signals (although some harmonics would also be amplified) so S/N should be significantly increased. The mechanical positioning of the elements (dependent upon frequency) gives this advantage.</p></blockquote><p></p>
[QUOTE="Low Profile, post: 793583, member: 190036"] The rear element is λ/2 from the rear plate, so any reflected waves from the rear plate are in phase (effectively increasing the signal), the front element is λ/2 from the rear element so you have maximum deflection between the two elements (hence the diff amp). The 'beauty' of this is it is tuned to in-band signals (although some harmonics would also be amplified) so S/N should be significantly increased. The mechanical positioning of the elements (dependent upon frequency) gives this advantage. [/QUOTE]
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Fringe Reception General
Anyone tried to make BIG dish at home?
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