Difference between revisions of "New site and tripod setup description"
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| + | This a description Max Kaufman had written up; Yuning and Ronni volunteered as guinea pigs for the pre-existing site part. | ||
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Revision as of 04:13, 30 May 2008
This a description Max Kaufman had written up; Yuning and Ronni volunteered as guinea pigs for the pre-existing site part.
| pre-existing site | new site | |
| 1. | extend tripod legs equally to chest height. | same. |
| 2. | adjust tribrach knobs to reference line. | same. |
| 3. | fasten tribrach onto middle of the tripod head. | place entrire tribrach/optical plumb on tripod. |
| 4. | use tribrach to position tripod correctly over marker by satisfying the following 3 conditions: 1. bulls eye level bubble is level |
spread tripod feet out @ 1 m separation and locate them so that tribrach is level. |
| 5. | With leg clamp loose, stomp tripod feet firmly in soil (stabelize with rocks if necessary) | same. |
| 6. | roughly level tribrach again by adjusting tripod leg length. | same. |
| 7. | attach optical plumb to tribrach and focus 2 things: 1. focus large knob on marker |
same. |
| 8. | loosen tribrach using the hollow screw and the steer the dot in the sight over to within 1 cm of center punch on marker. | Take your nail w/ pre-existing punch mark or small drill hole in head. One person pounds nail into ground while other person guides its placement - centered under the leveled tripod. |
| 9. | re-level the tribrach bulls-eye by adjusting the leg length. | celebrate the new benchmark. |
| 10. | confirm still centered near the punch mark in view. | celebrate a little more. |
| 11. | fine tune the leveling of long level bubble on optical plummet: 1. align bubble between 2 tribrach knobs and level it by turning knobs equally and in opposite directions. |
same. |
| 12. | rotate optical plumb by 180° ti see if long bubble is correctly balanced. If not then split the difference back towards the center so the bubble is off by the same number of ticks (e.g. to the left) at 180° opposite orientations of optical plumb. For example a badly balanced bubble might be level wehn it is 2 ticks off to the left (as you face the bubble).
|
same. |
| 13. | Once the tribrach is finely leveled, you are not neccessarily still centered on the marker. You must loosen the hollow screw just slightly enough to allow for translation without rotation of the tribrach (slide it on the
tripod head with braced hands) while looking through sight so that dot in scope is centered on punch mark.
|
same. |
| 14. | Repeat steps 11 to 13 until level and centered | |
| 15. | Now you are level and centered. Screw lock optical plumb to prevent it rotating. Fasten antenna to top of optical plumb with brass adapter. | |
| 16. | Orient true north (if no magn. declenation is given, use 25°E for Alaska) and screw lock adapter to keep it from rotating | |
| 17. | measure out slant height with height stick to underside inner egde of 3 notches. Read stick from opposite undersite of tripod. Record heights on logsheet to nearest half mm. All three measurements should be within 1 or 2mm of each other. (if not, try to find the problem by starting over at any of the above steps, check brass element for dirt, check antenna for being bent etc.) | |
| 18. | connect receiver power and antenna cables. All lights flash during boot, green light should come on. If not, press (green) power button. | |
| 19. | Receiver should track satellites in a minute (quick red blinking) to show slow red flash. Good. | |
| 20. | orange logging light should be on / blink slowly; if not press blue button to start logging. Wrap everything and store it safely so that neither bear, moose nor tides can carry it away. done. Find next site and continue with step 1 :) | |
