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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Fracarro 1m or Fracarro Penta85 manchester uk
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<blockquote data-quote="Huevos" data-source="post: 625760" data-attributes="member: 301161"><p>No, it is the size of the equivalent circular aperture. </p><p></p><p>Penta 85 = 77.5 cm * 77.5 cm = 6006 cm2; minus rounded corners (4 * 9 cm * 9cm = 332 cm2) = 5674 cm2.</p><p></p><p>Area of circular aperture as presented by conventional 85cm offset or prime focus dish = 42.5 cm * 42.5 cm * 3.1416 = 5674 cm2.</p><p></p><p>The triax TD 110 has a dish face of 105 cm * 100 cm so the circular aperture is 1 metre. The area of a 1 metre circular aperture = 50 cm * 50 cm * 3.1416 = 7854 cm2. That's 38.5% more dish face than the Penta 85, which equates to a 1.4 db increase in on-axis signal and a 1.4 db decrease in off-axis noise (I think).</p></blockquote><p></p>
[QUOTE="Huevos, post: 625760, member: 301161"] No, it is the size of the equivalent circular aperture. Penta 85 = 77.5 cm * 77.5 cm = 6006 cm2; minus rounded corners (4 * 9 cm * 9cm = 332 cm2) = 5674 cm2. Area of circular aperture as presented by conventional 85cm offset or prime focus dish = 42.5 cm * 42.5 cm * 3.1416 = 5674 cm2. The triax TD 110 has a dish face of 105 cm * 100 cm so the circular aperture is 1 metre. The area of a 1 metre circular aperture = 50 cm * 50 cm * 3.1416 = 7854 cm2. That's 38.5% more dish face than the Penta 85, which equates to a 1.4 db increase in on-axis signal and a 1.4 db decrease in off-axis noise (I think). [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Fracarro 1m or Fracarro Penta85 manchester uk
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