Amateur Extra › E7 Practical Circuits › E7E08
E7E08
What are the principal frequencies that appear at the output of a mixer?
Pick an answer to check it.
Answer: C. The two input frequencies along with their sum and difference frequencies
A mixer outputs the two original input frequencies plus their sum and difference. For example, 10 MHz and 9 MHz produce 19 MHz and 1 MHz as well.
Tip: Mixer: the inputs, plus sum and difference.