2m0iig-satellite-yagi
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2m0iig-satellite-yagi [2022/08/25 11:37] – mm3iig | 2m0iig-satellite-yagi [2022/08/27 21:08] – 2m0iig | ||
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- | ====== 2/70 Direct-Fed Satellite Yagi ====== | + | ====== 2/70 Direct-Fed Satellite Yagi (work in progress) |
===== Introduction ===== | ===== Introduction ===== | ||
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{{: | {{: | ||
- | In terms of performance, | + | In terms of performance, |
<WRAP clear></ | <WRAP clear></ | ||
- | <WRAP left round box 65%> | + | <WRAP left round box half> |
===== Parts List ===== | ===== Parts List ===== | ||
- | {{ : | + | {{: |
* 1m section of 20mm rigid PVC conduit | * 1m section of 20mm rigid PVC conduit | ||
* 3 x 20mm conduit spacer bars | * 3 x 20mm conduit spacer bars | ||
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</ | </ | ||
- | <WRAP right round box 31%> | + | <WRAP right round box third> |
===== Dimensions ===== | ===== Dimensions ===== | ||
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===== Build Process ===== | ===== Build Process ===== | ||
- | {{ : | + | {{ : |
A hole was then drilled below the feedpoint and shaped to make the wire come out at a shallower angle, leaving space for a small clip-on ferrite between the feedpoint and the hole. Feed the RG58 up the bottom of the pole and out of the drilled hole. And then put the boom to one side for now. Time to make the elements. | A hole was then drilled below the feedpoint and shaped to make the wire come out at a shallower angle, leaving space for a small clip-on ferrite between the feedpoint and the hole. Feed the RG58 up the bottom of the pole and out of the drilled hole. And then put the boom to one side for now. Time to make the elements. | ||
<WRAP clear></ | <WRAP clear></ | ||
- | {{: | + | {{: |
- | The bottom of the top two spacer bars have small lengths of solid core wire joining the two sides, wound around the screw threads tightly before screwing the screws down as far as I could. Check the continuity at this point! The two sides have to be joined together to make a continuous half-wave radiator. | + | The bottom of the top two spacer bars on the boom have small lengths of solid core wire joining the two sides, wound around the screw threads tightly before screwing the screws down as far as I could. Check the continuity at this point! The two sides have to be joined together to make a continuous half-wave radiator. The bottom, driven elements have to remain separated, so just wrap the coax centre and shield - one around each thread - and screw those tightly too. |
<WRAP clear></ | <WRAP clear></ | ||
- | {{ : | + | {{ : |
<WRAP clear></ | <WRAP clear></ | ||
Initially I used some tape to hold the spacer bars in place while I tuned the antenna on a VNA. I used the dimensions Adam gave as a starting point and retracted the telescopic lengths until I had a decent tune on both 70cm and 2m. I then slid the spacer bars a tiny bit back and forth and checked the tune. After dialling it in well I drilled a hole in the middle of each top clip and used some self-tapping screws to firmly secure the bars to the pole section. | Initially I used some tape to hold the spacer bars in place while I tuned the antenna on a VNA. I used the dimensions Adam gave as a starting point and retracted the telescopic lengths until I had a decent tune on both 70cm and 2m. I then slid the spacer bars a tiny bit back and forth and checked the tune. After dialling it in well I drilled a hole in the middle of each top clip and used some self-tapping screws to firmly secure the bars to the pole section. | ||
+ | And that is basically it. Keep the M3 bolts, nuts, and wingnuts tightened (this will annoy you, they are joined at only one place so things will rotate when you don't want them to or when travelling etc - is there some sort of locking nut you can use to stop this?) and make sure you don't bend any of the telescopic elements. The more you do that the more out-of-plane they' | ||
- | (More to follow...) | + | The elements will, of course, bend at the right-angled join, meaning that you can store the antenna stowed, attach it to a rucksack, etc. Or you can fully disassemble and reassemble each time. Bring a spanner! And maybe a small screwdriver. |
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+ | {{ : |
2m0iig-satellite-yagi.txt · Last modified: 2022/12/08 19:34 by 2m0iig