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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Rotate offset dish?
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<blockquote data-quote="Channel Hopper" data-source="post: 831879" data-attributes="member: 175144"><p>You are half right in your reasoning, but for the wrong reasons. Elliptical antennas are used in many networks where the wider part of the reflector is optimised in the plane towards the satellite by 'twisting' it either side of vertical (using a third set of bolts between the elevation and declination ones). You may see them on SNG trucks, but are more common round here on the top of police vehicles stationed at known speed trap areas, and on the backs of post offices and gambling dens in the high street.</p><p></p><p>This is however used for improving sidelobe performance on a receive/transmit antenna but they only work with an elliptical feed that is matched to the design. On a receive only dish with a standard LNBF, or matched feed that is circular in shape, you are unlikely to see much of an improvement.</p><p></p><p>But there is no reason not to try, is there.</p></blockquote><p></p>
[QUOTE="Channel Hopper, post: 831879, member: 175144"] You are half right in your reasoning, but for the wrong reasons. Elliptical antennas are used in many networks where the wider part of the reflector is optimised in the plane towards the satellite by 'twisting' it either side of vertical (using a third set of bolts between the elevation and declination ones). You may see them on SNG trucks, but are more common round here on the top of police vehicles stationed at known speed trap areas, and on the backs of post offices and gambling dens in the high street. This is however used for improving sidelobe performance on a receive/transmit antenna but they only work with an elliptical feed that is matched to the design. On a receive only dish with a standard LNBF, or matched feed that is circular in shape, you are unlikely to see much of an improvement. But there is no reason not to try, is there. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Rotate offset dish?
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