úterý 19. října 2021



čtvrtek 17. června 2021

S9OK next trip of Czech DX pedition group


Sao Tome 2021

Latest news you can find at the  facebook Czech DX pedition group.

Dates:  Arrival : October 2rd , Departure :October  16th

On air approx: limited/building up October 03.-05., full operation planned from 05th till 14th, dismantling 15-16., departure on October 16

Call sign:  S9OK

Operators: Petr OK1BOA, Petr OK1FCJ, Palo OK1CRM, Pavel OK1GK , Ruda OK2ZA, Ludek OK2ZC, Karel OK2ZI, David OK6DJ

Operation modes:  SSB, CW, RTTY , FT8

Based on the local internet availability, we plan to use Club Log Live Stream wherever it will be possible.
Our Live Stream link https://clublog.org/livestream/s9ok

Radios: Elecraft K3 3x , Kenwood TS480HX 3x , SunSDR2DX  PA:  JUMA PA1000 5x  Antennas: 6m  4el. YAGI,  10-15-20 incl WARC 3 x Spiderbeam, 17/12m 2el. YAGI, 2x 30m phased verticals, 2x40m phased verticals,  80m  vertical + 10 pcs radials, 160 vertical +10pcs radials RX: 3x Beverage + RX vertical  Focus on low bands

Voacap propagation charts https://www.voacap.com/dx/s9ok/ Thanks to Jari OH6BG


OK6DJ QRZ address: David Beran, Dolni Kamenice 55, Holysov 34562, Czech Republic. Help us reach our goal. Donate the DXpedition via paypal. Do not forget to provide your NAME and CALLSIGN and Email when donating:

E-mail: antsat (at) atlas (dot) cz 

Loc: JJ30HJ

pátek 9. dubna 2021

Non-functioning bands 40 and 30m on the antenna Ultrabeam UB-50

After repairing the engine at WIMO, when the tapes were replaced, the 40m and 30m bands did not always work, and when strange noises started to be heard when switching from 20m to 30m, for example, I found out after splitting the corners that the tape did not run over the corners.

As can be seen from the picture, the original aluminum corner has a very small radius, so I bought a plastic goal for training footballers, cut it in half and replaced the aluminum corners with larger ones.

After removing the corner, about 200 ml of water flowed out of it.

So I drilled 2 holes in the new corner for condensate drainage from below.

The repair cost 12 EURO per goal and I had to climb the scaffolding several times.

The antenna again works beautifully at 40 and 30m.

end of the tape

plastic goal

testing a new corner

old and new corner

new corner done