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--- hambasics:sections:wavemodulation [2026/04/01 20:18] – [Modulation] va7fi
+++ hambasics:sections:wavemodulation [2026/04/01 20:47] (current) – [FM] va7fi
@@ Line 68: / Line 68: @@
 ====== Modulation ======
 Modulation is the process of "encoding" a message (be it voice or digital) onto a radio wave.
+===== Activity =====
+If you have access to an HF radio:
+  - Tune in to an AM signal and notice what happens as you slowly move off frequency:
+    - How does the quality of the audio change?
+    - How far can you go before you can't understand the audio anymore?
+  - Tune in to an SSB signal and notice what happens as you slowly move off frequency:
+    - How does the quality of the audio change?
+    - How far can you go before you can't understand the audio anymore?
@@ Line 201: / Line 210: @@
 {{  fm02.png  }}
-Here, the math is a bit more involved and requires at least 1<sup>st</sup> year calculus to understand but in a nutshell, if the carrier is \$$ c(t) = \cos(2 \pi f_c t) \$$ and the baseband signal is \$$s(t)\$$, then the FM signal will be:
+Here, the math is a bit more involved and requires at least 1<sup>st</sup> year calculus to understand but in a nutshell, if the carrier is \$ c(t) = \cos(2 \pi f_c t) \$ and the baseband signal is \$s(t)\$, then the FM signal will be:
 <WRAP centeralign>