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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Is a 4 degree separation on a 60cm dish possible?
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<blockquote data-quote="a33" data-source="post: 953017" data-attributes="member: 332642"><p>That's right, the distance between the heads is the one thing that is relevant with monoblock LNBs.</p><p>Manufacturers advertise for them saying it is a x-degree (arc-)separation for a q cm dish, but that is only true for a specific region, and doesn't give much information.</p><p>Relevant is the '<u>focal distance</u>' of the actual dish (with a offset-dish: the 'adapted' focal distance), and the <u>azimuth difference</u> between the two satellites at your location.</p><p>From these two the <u>needed distance between the center of the heads of the monoblock</u> for your location can be calculated.</p><p>(The focal distance of an offset dish is dependent on the <u>width of the dish</u>, that's why they usually mention the width. For calculation of focal distance you need the f/D-ratio of the (offset) dish, to get the proper f.)</p><p></p><p>So: your 90 cm dish gives stronger signal, yes! But the heads in your monoblock are probably not far enough apart for problem-free reception of both 19e and 23e on a 100cm dish in Spain; you need a dishsize fit for your monoblock. Or you have to buy a monoblock with correct distance for the 90cm dish. Or, even better adjustable, two LNBs on a multifeed-rail in combination with a diseqc switch.</p><p></p><p>greetz,</p><p>A33</p></blockquote><p></p>
[QUOTE="a33, post: 953017, member: 332642"] That's right, the distance between the heads is the one thing that is relevant with monoblock LNBs. Manufacturers advertise for them saying it is a x-degree (arc-)separation for a q cm dish, but that is only true for a specific region, and doesn't give much information. Relevant is the '[U]focal distance[/U]' of the actual dish (with a offset-dish: the 'adapted' focal distance), and the [U]azimuth difference[/U] between the two satellites at your location. From these two the [U]needed distance between the center of the heads of the monoblock[/U] for your location can be calculated. (The focal distance of an offset dish is dependent on the [U]width of the dish[/U], that's why they usually mention the width. For calculation of focal distance you need the f/D-ratio of the (offset) dish, to get the proper f.) So: your 90 cm dish gives stronger signal, yes! But the heads in your monoblock are probably not far enough apart for problem-free reception of both 19e and 23e on a 100cm dish in Spain; you need a dishsize fit for your monoblock. Or you have to buy a monoblock with correct distance for the 90cm dish. Or, even better adjustable, two LNBs on a multifeed-rail in combination with a diseqc switch. greetz, A33 [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Is a 4 degree separation on a 60cm dish possible?
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