Discussion
What advantage does an up-converting receiver have on the high frequency bands?
Answer: A
With a first intermediate frequency above the highest signal frequency, the image lies beyond the band the receiver covers and a simple low-pass filter rejects it completely. That is why general coverage receivers convert 0 to 30 MHz up to 45 MHz or higher. Ganging is still needed or replaced by synthesis. The detector is unaffected. And a high intermediate frequency makes narrow filtering harder, which is why a second conversion usually follows. Moving a problem outside the range of interest is often better than solving it.
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