for course towards Amateur radio license

1. Electrical Safty

3. Heart 1. Sinoatrial node2. Atrioventricular node3. Bundle of His4. Left bundle branch5. left posterior fascicle 6. left-anterior fascicle7. Left ventricle8. Ventricular septum9. Right ventricle10. Right bundle branch

4. Heart

5. Electricity Current kills 10 mA for women 15 mA for men Through the heart Resistance Skin resistance About 500 kW when dry About 1 kW when wet Internal resistance About 80 – 600 W

6. Electricity Stay dry Avoid electricity through the heat One hand in pocket. Don’t work alone or when tiered No headphones on

7. Electricity Repairing equipment Make sure you have no current in the system Discharge capacitors Power off unplug

8. Lead acid battery 12 V car battery Deep cycle batteries Electrodes Lead Lead(IV) oxide (PbO2) Sulphuric acid electrolyte (H2SO4)

9. Lead acid battery Explosion risk Overcharging Oxygen and hydrogen Acid risk Add acid to water!

10. NiCad Batteries 1.2V per cell Positive plate : nickel(III) oxide-hydroxide Negative plate : Cadmium Electrolyte: potassium hydroxide (KOH) Explosion risk: release oxygen or hydrogen Overcharging Reverse charging

11. Grid power supply 230 V RMS AC, up to 15 A, 3 phase Insulation Earthing All metal! Morse key Microphone Remove metal Rings Watches

12. CE mark EU safety mark Health Environment Groups Electromagnetic Explosion Voltage

13. Power Supplies Isolation Transformer Opto-isolation Bleed resistor Circuit breakers Switch Current overloads / short circuits Several amps Residual Current Device (jordfelbrytare) Imbalances between live and neutral 5-30 mA leakage current

14. Antennas Watch out for power lines!!! Antennas can heat up Power losses in the antenna Static Grounding Don’t touch Live voltage

15. Antennas Category 1: < 7 W Category 2: 7-50 W Category 3: > 50 W

16. Questions?