JI1FGX/DU9 Amateur Radio Diary, Mindanao, Philippines, IOTA OC-130.
English. Japanese.



Yesterday's access.
Introduction. [Lily Diary.】
A diary of life in Mindanao.

   
25/07/13  IARU HF Contest
25/07/10 Software updates
25/07/08 DXV500ZS linear amplifier repair
25/07/07 CQ Machine Program
25/06/21 LoTW system upgrade
25/06/18 RG8 for 3.5MHz arrived
25/06/15  Time setting Ver0.5
25/06/14 Drone Habsan ZINO arrives
25/06/12 Philippine Independence Day
25/06/11 Algeria 7X2RF QSL card.
25/06/10 Translation API Program
25/06/09 DXCC150 award certificate arrived
25/06/08 AutoCWType_Ver1.4.1
25/06/07 Introducing the Shack
25/06/06 A portrait drawn 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 antenna.
Stepping motors
25/05/15 3.5MHz stepping motor design.
25/05/14 3.5MHz tuning coil installed.
25/05/11 3.5MHz antenna installation completed.
25/05/03 JTDX Autonomous Driving 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 Preparing for FTDX3000 LCD repair.
25/04/22 Installation plan for 3.5MHz Zepp antenna.
25/04/21 AutoCWType_Ver1.1.
25/04/20 10,14MHz antenna installation completed.
25/04/19 JTDX Autonomous Driving Program Ver0.4.1.
25/04/19 14MHz antenna pole installed.
25/04/18 ThinkPad X390 repair completed.
25/04/17 Search is now possible.
25/04/15 Preparing the 10MHz dipole.
25/04/12 Hexbeam Part8.
25/04/06 My ThinkPad X390 is broken.
25/04/05. Time setting program.
25/03/31 JTDX Autonomous Driving Program.
25/03/30 Automatic log sending from CWType to Hamlog.
25/03/21 Hexbeam Part 7.
25/03/20 FreeDV Part 3 First QSO.
25/03/18 FreeDV Part 2 QSO in the shack.
25/03/16 Hexbeam Part 6.
25/03/15 Install FreeDV Part1.
25/03/09 Hexbeam Part5.
25/03/07 Hexbeam Part 4.
25/03/05 28MHz antenna modification
25/03/01 FTDX3000 is broken!
25/02/28 Pileup at 50MHz FT8.
25/02/28 DXV500ZS linear amplifier repair.
25/02/27 Tower pipe rebuilding plan.
25/02/26 Direction to Japan from Ozamiz.
25/02/26 28MHz is not available.
25/02/23 DXV500ZS linear amplifier repair.
25/02/22 Hexbeam Part 3
25/02/21 Hexbeam Part 2
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 7,21MHz antenna repair.
25/02/08 Operating CW at 21MHz.
25/02/05 DXV500ZS linear amplifier failure.
25/01/19 Input Director.
25/01/14 Temporary license renewal.
Installation of 3.5MHz Twep antenna completed (2025/05/11) 


The installation of the 3.5 MHz twep antenna, which had been planned since last October, is now complete!
25/04/22 Installation plan for 3.5 MHz Twep antenna
 24/10/15  3.5MHz zepp transceiver antenna
I was looking for a plastic waterproof box to put the coils of the twep antenna in.
In the Philippines, large boxes were not sold.

So we changed our minds and decided to make a wooden box.
My wife's sister's husband, Ronel, built the box.

Lumber Material Cost 260 pesos Approx. 690 yen
2 cans of paint, brushes, sandpaper 677 pesos Approx. 1,800 yen
Box production cost 500 pesos Approx. 1,300 yen
Cost of climbing the tower and installing the antenna 500 pesos Approx. 1,300 yen
I helped, too, while sweating profusely.
After a cool night, I placed the coils in the box and measured the SWR
Coil and 40m element sent by Mr. Sugiura, JK1 SNS
Confirmation that the tuning point changes when the balicon is turned
SWR is also good at 1.5
I turned the balicon to 3.528 MHz.
The strange thing is that the SWR drops to 1.07 the more you touch the box.
The tuning point does not change at that time.
It's a mystery.
I turned the balicon to 3.680MHz
Again, the SWR will be lower if the box is touched.
Is it because the element passes just above the head?

Next I have to buy a coaxial cable.
Antenna Shape
It was supposed to be installed at the top of the tower 22 meters, but in fact it was installed at 18 meters.
Therefore, the power feed is now 25 m away from the tower.
View from above
Due to the site and the installation of the elements on top of the tower, it was not possible to make a straight line.
May 03, 2024   May 14, 2025