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Access until yesterday |
| Introduction. | 【【Lily Diary] Diary of Life in Mindanao |
| 24/12/11 | CVS conversion software for DXCC listings |
| 24/12/05 | Aggregation by country from JTDX |
| 24/12/02 | ADIF for one month from JTDX Programs that create files |
| 24/11/24 | CwGet and CwType settings |
| 24/11/24 | WWDX Contest |
| 24/11/21 | CQ Ham Radio |
| 24/11/20 | Call Sign Assignment IOTA Number |
| 24/11/13 | IOTA 100 Awards Arrival |
| 24/11/12 | LoTW WAZ and DXCC |
| 24/11/04 | PLDT Optical Internet |
| 24/10/30 | Pile-up of 50MHz FT8 |
| 24/10/28 | Camiguin Is Crowdfunding |
| 24/10/26 | 50MHz Yagi feeder |
| 24/10/21 | RTTY with MMTTY |
| 24/10/19 | Firmware for UV-5K |
| 24/10/17 | Antenna group seen by drone |
| 24/10/16 | 7MHz Antenna Pole |
| 24/10/15 | 3.5MHz zepp transceiver antenna |
| 24/10/14 | Hexbeam Purchase Plan |
| 24/10/13 | 24MHz dipole addition |
| 24/10/13 | 50MHz Yagi repair completed 50MHz FT8 first pile |
| 24/10/12 | Antenna production for 24 MHz |
| 24/10/09 | Trouble with Gmail |
| 24/10/09 | The Shack |
| 24/10/07 | JO1CRA/7 AS-206 |
| 24/10/05 | 3D2V Rotuma Island IOC-060 |
| 24/10/01 | Camiguin Island Trailer Video |
| 24/09/30 | Uruguay |
| 24/09/29 | 50MHz antenna installation |
| 24/09/25 | Pile up on the caller's side |
| 24/09/19 | IOTA 100 Award |
| 24/09/18 | IOTA Application |
| 24/09/12 | DXCC Application |
| 24/09/11 | FT8 in communication with KH8T |
| 24/09/08 | 50MHz Yagi Antenna |
| 24/08/28 | Pile up at FT8 |
| 24/08/07 | Pile up from FT8EU |
| 24/07/19 | JW/WE9G in Svalbard |
| 24/06/27 | Purchase of air conditioner for wireless room |
| 24/05/28 | antenna switch |
| 24/05/27 | MFJ-259B Repair |
| 24/05/10 | Completed 3-band antenna |
| 24/05/03 | 7MHz Dipole |
| 24/04/30 | 7MHz Domestic |
| 24/04/29 | Reopening Project |
| 24/04/04 | Repair of FTDX3000 |
| 24/03/21 | To NTC Cagayan |
| Putting 21MHz on a 7MHz dipole (2024/05/03) | ||
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| It is said that the third harmonic of 21MHz is carried on a 7MHz full-size dipole. However, if you actually try this, you will need to lower the SWR using the radio's built-in tuner, etc. However, when using the Samway linear amplifier DXV500ZS, it is difficult to use an antenna with a low 22.140MHz SWR. When measured with NanoVNA, the SWR drops at 21.140MHz.  |
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| When I was searching for information on the Internet, I found something similar on YouTube's "Momo Channel!" https://youtu.be/LbjRYRG9x9I?t=487 It is recommended to insert a 4-turn coil 3.5m from the end of the 7MHz dipole element. By winding the element four times, the SWR at 7MHz also drops at the target frequency. However, when I actually tried it, I found that by increasing the coil to 6 turns, the center frequency was reduced by 21MHz. This coil does not have a capacitor, just wind the coil.  |
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| Screen capture of NanoVNA's nanovna-severs software The center frequency, which was 22.140MHz, is now 21.220MHz, and the SWR is now 1.2.  |
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The SWR for 7MHz and 7.100MHz is now 1.7. |
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| April 30, 2024 May 10, 2024 | ||