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+=====ETA313-03: Theory lesson 2: Electric Circuits=====
+[[user:kurser:radiokurs:ham_vt2025|Back to course information]]
+**Recommended reading: KonCEPT page 84-144 (chapter 3)**
+Draw a superheterodyne TRX on the black board. Including antennas and propagation.
+Explain from TX to RX
+  * DAC which stands for Digital to Analog converter.
+    * Audio BW: 300-3000 Hz
+  * Pulse shape filter (LP)
+    * Show other filter symbols
+  * Mixer -> BP filter
+  * Oscillator
+  * Amplifier
+  * Mixer -> BP filter
+  * Oscillator + Frequency multiplier
+  * Power amplifier (PA)
+  * Antenna
+  * Antenna
+  * Low noise amplifier
+  * The rest of the superheterodyne receiver
+  * ADC which stands for Analog to Digital converter
+Explain what is heterodyne/homodyne
+Direct converting (DDS) radio and direct sampling.
+Dictionary
+^ English ^Svenska ^ Comment ^
+| Bandwidth             | Bandbredd               | |
+| Transmitter           | Sändare                 | |
+| Receiver              | Mottagare               | |
+| Transciever           | Sändtagare              | |
+| Mixer                 | Blandare                | |
+| Amplifier             | Förstärkare             | |
+| Power Amplifier       | Effektförstärkare       | |
+| Low-noise Amplifier   | Lågbrusförstärkare      | |