INFEX and DX Contest 2017

On Feb 18 the International Friendship Exchange (INFEX) and DX contest took place in the Philippines. DX1ACE participated with a group of eight girl scouts in the Dasmarinas National High School.

Station setup and test

12 m Fiberglass pole with 40 m inverted vee antenna

Girls are exited and having fun using the first time a radio

 

DU1 – Tagaytay – Jan 2017

During this visit I had more time to setup my station in Tagytay and test the antennas. I was very impressed by the performance of the spider beam  and even the good propagation on the lower bands.

IC-718 with AT-130 manual tuner, external speaker and Yaesu rotator controller. Using my Macbook for loggin and digital modes

Spider beam for 20, 17 and 15 m and trap dipole for 40 and 80 m

View from our terasse to the south. Ideal propagation in direction of Australia VK

On 1st of Feb I went to NTC and PARA office to take the exam for class A Philippine Amateur radio license. Hopefully I will receive my DU1 callsign soon.

Visit at PARA office in the NTC building in Manila

Retirement

Finally, after 30 years of service for Rohde & Schwarz,  I had my last day in the company. A small “good bye” celebration with a surprise present.

My boss Markus Becker

Prakash (HR), Markus, Klaus and Joseph.A darbuka (middle eastern drum) as present.

Of course, I had to play the drum.

Fiberglass Balcony Stealth Antenna for 40 m

In Singapore space is limited, and in our appartment it is difficult to setup any HF antenna. Our balcony is the only place where I have a space to mount something. Even there, officially nothing is allowed to extend out from the building.

I decided to setup a simple vertical, using a telescopic fiberglass pole, which I can pull out temporarly, when it is getting dark.  The pole has a total length of 10 m, approx. 1 m (the lowest segment) safely mounted to the balcony railing and sidewall.

vertical410 m fiberglass pole mounted to the balcony railing in the 17th floor.

holder1holder2Mounting

vertical1The actual antenna wire is fixed to the pole using Velcro strips. The horizontal wires on the picture are part of my short linear loaded dipole for 15 m and 17 m.

vertical2Antenna extended to 10 m

pipeclampsRubber protected pipe clamps to secure the segments and Velcro strips to attach the antenna wire to my telescope fiberglass pole. Allows quick extension and retracting of the antenna.

verk__00VSWR of 1.2 at resonance frequency 7.050 MHz, using only one radial around the outer wall of our appartment

Weak Signal Digital Modes on HF-Bands

Many open source programs are available for Windows, OS-X and Linux, if you want to become active on the amateur radio HF bands using digital modes. Modern coding and modulation schemes allow for long distance contacts with low power.

Below you can  download my presentation about PSK 31 (Phase shift keying) and JT-65/JT9 modes as presented in our monthly SARTS meeting August 2016 in Singapore.

Presentation (pdf): WeakSignalModes

 

DU1- Dasmariñas – Aug 2016

This time we stay longer than a week in our second home, and I set up a 12 m fibreglass pole with a G5RV multi-band dipole antenna for 40 m to 10 m. The pole is located at on corner of our area, the dipole endings are fixed at two other corners, so the antenna has a form of a 90 degree inverted vee.

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fibre glass pole

The antenna analyser shows clearly 3 resonant frequency points: around 40 m, 20 m and 10 m. All resonances seem to be below the amateur radio frequency bands, probably because of the inverted vee form.

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Using my “old” AT-130 antenna tuner, I can operate on all bands from 40 m to 10 m including the WARC bands.

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Assembling the antenna:

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Operation in digital modes using my home-brew interface:

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Time to disassemble, as we are going back to Singapore. Heavy duty 40 ft fiber glass pole and G5RV dipole:

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