2-element vertical array at oh1nm vert at oh1nm-2.pdf · 2-element vertical array at oh1nm pekka...
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![Page 1: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/1.jpg)
28.8.2009 OH1TV 1
2-element vertical array at OH1NM
Pekka Ketonen
OH1TV
![Page 2: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/2.jpg)
28.8.2009 OH1TV 2
The concept
![Page 3: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/3.jpg)
28.8.2009 OH1TV 3
![Page 4: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/4.jpg)
28.8.2009 OH1TV 4
The goal
•Seaside QTH
•Elevated radials
•Phasing angle 105 degrees
![Page 5: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/5.jpg)
28.8.2009 OH1TV 5
..the goal
![Page 6: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/6.jpg)
28.8.2009 OH1TV 6
..the goal
![Page 7: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/7.jpg)
28.8.2009 OH1TV 7
Step 1
• Measure impedances of the two radiating elements
• Two measurements per element
– Feedpoint impedance, when the other element is open
– Feedpoint impedance, when the other element is closed (short
circuit)
• This measurement is needed for mutual impedance calculations
• See results on next pages
![Page 8: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/8.jpg)
28.8.2009 OH1TV 8
West element, east element open
This comes from a
near by dipole tuned
to 3650kHz
![Page 9: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/9.jpg)
28.8.2009 OH1TV 9
West element, east element closed
![Page 10: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/10.jpg)
28.8.2009 OH1TV 10
East element, west element open
![Page 11: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/11.jpg)
28.8.2009 OH1TV 11
East element, west element closed
![Page 12: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/12.jpg)
28.8.2009 OH1TV 12
Step 2
• Calculate mutual impedance. The result shall be about
the same both ways. If there is more than 1 ohm
difference, there must be an error in the measurement or
disturbing other element close by
• Calculate phasing components
• Calculate input impedance of the array
• Calculate L-match components
• Results are shown in the phasing box schematic
![Page 13: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/13.jpg)
28.8.2009 OH1TV 13
Phasing box, schematicphasing angle 105 degrees
![Page 14: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/14.jpg)
28.8.2009 OH1TV 14
Step 3
• Build the phasing box, make the 0.5 lamda cable, install
• Measure SWR in both directions
• If the work so far has been done carefully, componets
selected with 2% tolerance, no tuning is needed after
installation.
• See results on next pages
![Page 15: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/15.jpg)
28.8.2009 OH1TV 15
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28.8.2009 OH1TV 16
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28.8.2009 OH1TV 17
![Page 18: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/18.jpg)
28.8.2009 OH1TV 18
Array SWR, direction east
This comes from a
near by dipole tuned
to 3650kHz
![Page 19: 2-element vertical array at OH1NM vert at OH1NM-2.pdf · 2-element vertical array at OH1NM Pekka Ketonen OH1TV. 28.8.2009 OH1TV 2 The concept. 28.8.2009 OH1TV 3. 28.8.2009 OH1TV 4](https://reader034.vdocuments.us/reader034/viewer/2022042515/5fae66f1355a98276030b746/html5/thumbnails/19.jpg)
28.8.2009 OH1TV 19
Array SWR, direction west