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Access until yesterday |
| Introduction. | [Lily Diary] Diary of Life in Mindanao |
| 25/06/08 | AutoCWType_Ver1.4.1 |
| 25/06/07 | Introducing the Shack |
| 25/06/06 | A portrait illustrated by ChatGPT |
| 25/05/26 | Windows full-width half-width switching |
| 25/05/17 | OK2ZAW BCD to 16 converter |
| 25/05/16 | For 3.5MHz zepp antennas Stepping motor this and that |
| 25/05/15 | 3.5MHz stepping motor plan |
| 25/05/14 | 3.5MHz tuning coil installed |
| 25/05/11 | 3.5MHz antenna installation completed |
| 25/05/03 | JTDX automatic operation program Ver0.4.3 |
| 25/04/26 | Drone Habsan ZINO |
| 25/04/25 | Time setting Ver0.3 |
| 25/04/24 | AutoCWType_Ver1.3 |
| 25/04/23 | FTDX3000 LCD repair preparation |
| 25/04/22 | Installation plan for 3.5 MHz Twep antenna |
| 25/04/21 | AutoCWType_Ver1.1 |
| 25/04/20 | 10,14MHz antenna installation completed |
| 25/04/19 | JTDX automatic operation program Ver0.4.1 |
| 25/04/19 | Antenna pole installation at 14 MHz |
| 25/04/18 | ThinkPad X390 repair completed |
| 25/04/17 | Search is now available. |
| 25/04/15 | Preparation of 10 MHz dipole |
| 25/04/12 | Hexbeam Part8 |
| 25/04/06 | ThinkPad X390 is broken. |
| 25/04/05 | Time Setting Program |
| 25/03/31 | JTDX Automatic Operation Program |
| 25/03/30 | Automatic log sending from CWType to Hamlog |
| 25/03/21 | Hexbeam Part7 |
| 25/03/20 | FreeDV Part3 First QSO |
| 25/03/18 | FreeDV Part2 QSO in shack |
| 25/03/16 | Hexbeam Part6 |
| 25/03/15 | FreeDV Part1 installation |
| 25/03/09 | Hexbeam Part5 |
| 25/03/07 | Hexbeam Part4 |
| 25/03/05 | 28MHz antenna modification |
| 25/03/01 | FTDX3000 is broken! |
| 25/02/28 | Pile up at 50MHz FT8 |
| 25/02/28 | DXV500ZS linear amplifier repair |
| 25/02/27 | Pipe and rebuild plan for tower |
| 25/02/26 | Direction of Japan from Ozamiz |
| 25/02/26 | 28MHz does not fly. |
| 25/02/23 | DXV500ZS linear amplifier repair |
| 25/02/22 | Hexbeam Part3 |
| 25/02/21 | Hexbeam Part2 |
| 25/02/18 | 28MHz antenna construction |
| 25/02/17 | 18,24MHz antenna height construction |
| 25/02/16 | Z26NS Cosovo |
| 25/02/14 | 21MHz FT8 |
| 25/02/12 | Antenna repair at 7,21 MHz |
| 25/02/08 | CW operation at 21MHz |
| 25/02/05 | DXV500ZS linear amplifier failure |
| 25/01/19 | Input Director |
| 25/01/14 | Temporary License Renewal |
| 7,21MHz antenna repair (2025/02/12) | ||
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| The dipoles at 7 and 21 MHz have a higher SWR, and the SWR is 1.9 at 7 MHz and 1.7 at 21 MHz. I got up on my heavy back and lowered the antenna under the scorching sun to check it out. (It is very hot in the daytime in Osamis, as if it were baking.) There was nothing particularly wrong, but the element length was measured. For some reason, the left and right lengths were different, so I adjusted the lengths.  |
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| The result is an SWR of 1.592 at 7.020 MHz and also an SWR of 1.5 at 21.110 MHz. When feeding a horizontal dipole's theoretical impedance of 75 Ω with 50 Ω coax, the SWR will be about 1.5 theoretical, so, The current measured SWR is 1.592, which is close to the theoretical value and can be said to be a level without practical problems. The Smith chart value is also 75 ohms, so it is in good condition. 7MHz value measured by NanoNVA SWR is at its lowest at 7.020 MHz.   |
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| Value at 21MHz measured by NanoNVA It is centered at 20.960 MHz, but this is within the margin of error, so it is left as is.   |
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| February 08, 2024 February 14, 2025 |