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SMW OA 1600 dish
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<blockquote data-quote="archive10" data-source="post: 923752"><p>Just waiting for a spot of nice weather co-inciding with a couple of hours free time...</p><p></p><p></p><p>The instruction manual is a bit weak, and relies a lot on looking up your position in the charts provided.</p><p>I have been squinting at the instruction for quite some time now, and I think I have gotten my head around things, but I still feel I am not quite sure what the terminology used is in some places.</p><p></p><p>Nevertheless, the sequence in the manual is more or less right, so I am thinking something like (mounting on a vertical 70 mm pole):</p><p></p><p></p><p>1) figure out the sat-position span of the dish.</p><p></p><p>As far as I can tell, the dish only does 26 or 27 degree span of sats. This does limit the usable range a bit. So for starters, I'll probably get "major" ones.</p><p>Currently, I'm thinking the most relevant ones for my viewing (!= feed-hunting) interests, e.g. 28.2E to 4.8E (23,4 degree span).</p><p></p><p></p><p>2) Choose a "middle sat"</p><p></p><p>Closest middle sat would be 28.2 - ((28.2 - 4.8) / 2) == 16.5E. No sat there, but 16E is close enough.</p><p></p><p>Put an LNB in holder in the middle of the LNB holder bar.</p><p></p><p></p><p>3) Adjust "antenna skew"</p><p></p><p>My longitude is about 12.5 degrees East. The difference between 12.5E and 16E is 3.5 degrees. So I look up my lattitude (56 degrees) and the difference (3.5) in the table in the manual, and determine that I should use first hole off centre in the "antenna skew" adjustment ring in the mounting bracket (both sides), effectively leaning the dish slightly to the left.</p><p></p><p></p><p>4) Mount dish on pole.</p><p></p><p>Put the dish onto the pole, but not tightening bolts. An exhaust pipe clamp as a base helps preventing the dish from sliding down during the following adjustments.</p><p></p><p></p><p>5) Set up declination</p><p></p><p>Dishpointer.com tells me the elevation of 16E is 26.5 degrees. The OA-1600 has an offset of 13 degrees, meaning the dish must be declined (is that the word?) 13.5 degrees. Looking at table E in the manual, I can see that the declination rod needs to be about 324 mm long. Adjust accordingly.</p><p></p><p></p><p>6) Align azimuth.</p><p></p><p>Set the rough direction of the antenna to correspond to 16E. Use dishpointer and what have you. Set meter on, and try to catch 10721H with HRT 1 on it. Adjust dish until max reading.</p><p></p><p></p><p>7) Fine tune declination</p><p></p><p>...to maximise signal level.</p><p></p><p></p><p>8) Optional: Antenna skew optimisation.</p><p></p><p>At this point we *could* attempt an optimisation of the antenna skew. The current resolution of skew setting is 3-6-9-etc degrees. This step would adjust the "middle" pointing of the dish to ensure the skew is aligned with the clarke belt as seen from my exact geogrpahical location.</p><p></p><p>That would entail putting an LNB at an edge position (e.g. 28.2E), and then in small steps move the whole antenna and adjust position of edge LNB until maximum had been found. Exact steps to be worked out before attempting...</p><p></p><p></p><p>9) Tighten antenna mounting bolts</p><p></p><p>As we are now done with pointing the antenna itself, we can tighten all bolts.</p><p></p><p></p><p></p><p>10) Configure proper LNB positions</p><p></p><p>Remove the "centre" LNB. (Or rather move the centre LNB to be at one of the dsired LNB positions).</p><p></p><p>Add and adjust LNBs for 4.8E, 13.0E, 19.2E, 23.5E and 28.2E.</p><p></p><p>Each LNB must be added as he approximate position of that sat relative to the "centre sat". There is a scale printed on the front of the square tube where the LNB holder atach to. Unfoteunately, it's been worn away (mostly) ob my dish.</p><p></p><p>Alternative is to look at arc coverage (26 degrees), and divide span of square tube accordingly, then trial-and-error your way to the correct placement of LNBs. This worked well for me with the T55.</p><p></p><p></p><p>11) Cable up and be happy!</p></blockquote><p></p>
[QUOTE="archive10, post: 923752"] Just waiting for a spot of nice weather co-inciding with a couple of hours free time... The instruction manual is a bit weak, and relies a lot on looking up your position in the charts provided. I have been squinting at the instruction for quite some time now, and I think I have gotten my head around things, but I still feel I am not quite sure what the terminology used is in some places. Nevertheless, the sequence in the manual is more or less right, so I am thinking something like (mounting on a vertical 70 mm pole): 1) figure out the sat-position span of the dish. As far as I can tell, the dish only does 26 or 27 degree span of sats. This does limit the usable range a bit. So for starters, I'll probably get "major" ones. Currently, I'm thinking the most relevant ones for my viewing (!= feed-hunting) interests, e.g. 28.2E to 4.8E (23,4 degree span). 2) Choose a "middle sat" Closest middle sat would be 28.2 - ((28.2 - 4.8) / 2) == 16.5E. No sat there, but 16E is close enough. Put an LNB in holder in the middle of the LNB holder bar. 3) Adjust "antenna skew" My longitude is about 12.5 degrees East. The difference between 12.5E and 16E is 3.5 degrees. So I look up my lattitude (56 degrees) and the difference (3.5) in the table in the manual, and determine that I should use first hole off centre in the "antenna skew" adjustment ring in the mounting bracket (both sides), effectively leaning the dish slightly to the left. 4) Mount dish on pole. Put the dish onto the pole, but not tightening bolts. An exhaust pipe clamp as a base helps preventing the dish from sliding down during the following adjustments. 5) Set up declination Dishpointer.com tells me the elevation of 16E is 26.5 degrees. The OA-1600 has an offset of 13 degrees, meaning the dish must be declined (is that the word?) 13.5 degrees. Looking at table E in the manual, I can see that the declination rod needs to be about 324 mm long. Adjust accordingly. 6) Align azimuth. Set the rough direction of the antenna to correspond to 16E. Use dishpointer and what have you. Set meter on, and try to catch 10721H with HRT 1 on it. Adjust dish until max reading. 7) Fine tune declination ...to maximise signal level. 8) Optional: Antenna skew optimisation. At this point we *could* attempt an optimisation of the antenna skew. The current resolution of skew setting is 3-6-9-etc degrees. This step would adjust the "middle" pointing of the dish to ensure the skew is aligned with the clarke belt as seen from my exact geogrpahical location. That would entail putting an LNB at an edge position (e.g. 28.2E), and then in small steps move the whole antenna and adjust position of edge LNB until maximum had been found. Exact steps to be worked out before attempting... 9) Tighten antenna mounting bolts As we are now done with pointing the antenna itself, we can tighten all bolts. 10) Configure proper LNB positions Remove the "centre" LNB. (Or rather move the centre LNB to be at one of the dsired LNB positions). Add and adjust LNBs for 4.8E, 13.0E, 19.2E, 23.5E and 28.2E. Each LNB must be added as he approximate position of that sat relative to the "centre sat". There is a scale printed on the front of the square tube where the LNB holder atach to. Unfoteunately, it's been worn away (mostly) ob my dish. Alternative is to look at arc coverage (26 degrees), and divide span of square tube accordingly, then trial-and-error your way to the correct placement of LNBs. This worked well for me with the T55. 11) Cable up and be happy! [/QUOTE]
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