Radioclub OK1OAB (My home radioclub)

Tomáš OK1GTH and Radioclub OK1OUE

Radioclub OK1KPA

Jarda OK1CJB 

Mario DH5YM

Pavel OK1VEI

DK7ZB Antennas

G0KSC Antennas

DG7YBN Antennas

YU7EF Antennas

YU1AW Projects

LY4SKY HAM/Radio Astronomy

W1GHZ Microwaves

W8JI Projects

W6PQL Projects

OE7 Amateurfunkforum

DJ0IP Projects

GNU Radio Tutorials

SDR - FPGA blog

Hackster

Useful Links

ON4KST amateur radio chat

DX Cluster OH8X

DX Cluster F5LEN

Find your QTH locator

Locator map

Path Profile

Path Profile 2

EDI Visualizer

Samtec Connectors

All about circuits - Tools

Impedance calculator

PCB current/thickness calculator 1

PCB current/thickness calculator 2

SDR OK1KPU Cinovec 80-20m

EME chat

EME Cluster

WG7J's GridMapper

Propagation

Propagation MUF(3000km) f0F2

Elevation Map

MLA calculator

Free software

Log Analyzer QSO Map

FIR Design Tool

RF Tools 

Sat passes

RF Excel Tools

Weather (WX)

Czech Hydrometeorological Institute - Radar, Lightning 

Naval Oceanography Portal

LightningMaps.org

Others

Aldebaran (Astrophysics)

Volunteer firefighters from Petroupim, Photo gallery

DeepL Translator