ok4bx's blog

CQ WW CW 2012 - OK4BX


CQ WW CW contest is one of my most favourite contests in year. I participate every year if it is possible. There is no change on our station, so I decided try newly assisted category with data from public reverse beacon network. Made pre-contest tests and it looked promising.

DX Cluster filtering for #CQWW contest


reject/spots 1 not by_zone 14,15,16 – Exclude spots received outside CQz 14–16
reject/spots 2 on warc – No WARC
reject/spots 3 freq 160m – No 160m
reject/spots 4 freq 80m – No 80m

show/filter – Show current filtering
clear/spots [0–9] – clear defined filtering slot
clear/spots all – clear all filters

Yaesu FT817 Filter installation


My FT817 has new CW filter

  • Remove top cover
  • Unscrew red marked screws (not visible side is not marked)
  • Loosen blue marked screws

  • It is not necessary remove speaker plug
  • Filter fit to pins very gently

  • Set Menu #38 CW or SSB depends on your filter type
  • Active filter: Function → Rotate position 7 → Button “C” – “NAR”
  • Enjoy!

144MHz A1 Marconi contest 2012


I was giving points with our club call OK1RIG to others in this contest for about two hours. I used our dual band vertical and FT817 powered from internal battery. This mean 20dB loss due different antenna polarization to other stations and only max 3 watts power output from TRX.

Worked those stations (18): OE1W, OK5Z, OM3W, OM3TZZ, OK6TW, OK2KGB, OK2KG, OK2DGB, HA2R, OL2J, OK1KCR, OM2DT, OM6A, OL1Z, OM3RAL, OL1B, OK2AF, OK2C

Heard DK6AS from JN59OP which is 340km

CQ WW SSB 2012 - OK4BX


I joined CQWW SSB contest also this year. There is always same hardware at our station, so 10m was only one choice for me. It is only band, where our vertical perform good SWR in whole phone portion of band. CONDX forecast was promising and I hoped for similar propagation like in 2011.



Also in this weekend dad and I participated in CQ WW RTTY contest. This time each of us used different callsign. I had my own – OK4BX, dad used our new Radio Club callsign – OK1RIG. Condx were awesome whole weekend and I spent most time on 15m & 10m bands. Dad sat by radio during Saturday evening and night to early Sunday morning.

Buro qsl cards analyze


Every year we visit town Holice, where is performed one of biggest hamradio event in our country. Every year we handle Buro cards there, incoming a outcoming. This time I received a lot of nice (DX) cards and I got idea make little analyze what cards came through Buro for me last year.

Raspberry Pi


Tak jsem pred nekolika mesici po velke prvni vlne take neodolal a vyplnil formular k pred objednani maliny a trpelive cekal co se bude dit. I kdyz jsem tomu moc neveril, tak jsem se cca po 2 mesicich dockal. Na kartu nahral oficialni distribuci, toho casu Squezze a podarilo se me nabootovat do shellu, posleze i do Lxde.

Prefix quiz in Python


For anyone who wants drill hamradio prefixes like me, I wrote this simple python script. It is my next python exercise. It works only one way: Question is prefix, Options are DXCC entity names. It is based on cty.dat. It is available at www.country-files.com and must be in same directory as code below. Hit ctrl-c or ctrl-break to exit app.

Have a fun !



160M 0 0 0
80M 19 37 5
40M 160 342 95
20M 245 373 151
15M 279 539 175
10M 74 120 30
Total 777 1411 456
Score 643416

TRX Icom 756pro2 50W. Antenna multiband 40–10m by sp7gxp. All QSOs made S&P. Always was possible find new stations anywhere. It was fun spent all the weekend by radio.
Highlight: HK1NA, NH2T & ZL3IO.

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