Some time ago came my son Tomas ok4bx with idea monitoring QRSS signals. I liked that idea and I decided made in my free time, I am in pension, that I will build something related with QRSS. At first I homebrewed DC RX on 30m – M0AYF design. Another device was MEPT with DDS module on 40 and 30m, when I made 250mW RF part and Tomas worked on logic unit and finally revive it. I am friend of OLD TIMER gears, then it was not too far to idea make QRSS DC RX with tubes. Today it is “anarchy” when there is 5W input power of heater and another half Watt in plate circuit.

QRSS Přímosměšující elektronkový RX 40m


Není to tak dávno, co můj syn Tomáš ok4bx přišel s myšlenkou sledování QRSS majáků. Protože se mně tato myšlenka zalíbla a také mám také dostatečný časový prostor, rozhodl jsem se, že také pro QRSS něco vyrobím. Od té doby jsme oba dva společně postavili QRSS DC RX dle M0AYF, později to byl TX s DDS na 40 a 30m, kde jsem synovi pomohl vyrobit dvoutranzistorový PA 250mW. Logickou část a oživení si potom udělal sám. No a že jsem vyznavačem OLD TIMER techniky, tak už nebylo daleko k nápadu, udělat QRSS DC RX s elektronkami.

Hamradio photo mix


I put together this hamradio compilation for fun. Those pictures came from me and my twitter friends. All photo rights belong to their authors. Music rights belong to rumblefish.

Explore DXCC in Google Earth


I love geography, I love explore world in Google earth and I love hamradio. After years, I can't still say I know all prefixes of DXCC entities. So, I got idea write simple python script and put DXCC entities into Google earth and start explore. If you have same passions, lets download pfx.kmz and open GE

Overview OK4BX 2012


RAEM contest OK1RIG 2012


On Sunday, hour before local noon dad informed me, that RAEM contest is underway. Hmm, I took it as invitation to sit by radio and make some radio contacts in last 2 hours of contest.

#QRSS MEPT @OK1RIG made it to ZL


We made first observation when OK1RIG 30M QRSS MEPT probably appeared on ZL2IK few days ago. Unfortunately, it was quite weak and interfered with IV3ZXY signal and it was hard to decode our full callsign on the screen. We compared it with LA5GOA grabber and traces were pretty same.

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!

Syndicate content