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--- user:kurser:ham_vt2023_l3 [2023/01/03 17:38] – created ETA313-03 user
+++ user:kurser:ham_vt2023_l3 [2023/02/12 16:55] – user
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 =====ETA313-03: Theory lesson 2: Electric Circuits=====
+[[user:kurser:ham_vt2023|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.
+Mention the SDR lab. Ask if people can bring own SDR or radios.
+https://sk6ag.org/sdr-mottagare/