Discussion
Why is an antenna trimmer sometimes fitted to a broadcast receiver?
Answer: D
The antenna trimmer compensates for the particular aerial in use, peaking the transfer of signal into the input circuit. Oscillator tracking at the low end is the padder's job, intermediate frequency alignment is done at the transformers themselves, and the gain control threshold is set by biasing. Each adjustment exists to absorb a different unknown, and the aerial is the one unknown the manufacturer cannot predict.
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