Which of the following choices is a good reason for selecting a high IF for a superheterodyne HF or VHF communications receiver?
Fewer components in the receiver
Reduced drift
Easier for front-end circuitry to eliminate image responses✓Правильный ответ
Improved receiver noise figure
Объяснение
In a superheterodyne receiver the image lies twice the intermediate frequency away from the wanted frequency, so a high IF pushes it far off and a relatively simple front-end filter can reject it. A high IF generally needs more circuitry and does not improve noise figure or drift.