A receiver selectivity of 2.4 kHz in the IF...

Question 1 of 27070qWrUyBwilhtXXCy9KZej

A receiver selectivity of 2.4 kHz in the IF circuitry is optimum for what type of signals?

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Question 1 of 27070

Q

A receiver selectivity of 2.4 kHz in the IF circuitry is optimum for what type of signals?

🔍 Key Concepts

• Receiver selectivity and bandwidth in the intermediate frequency (IF) stage • Typical occupied bandwidth of CW, SSB voice, DSB-AM voice, and FSK RTTY signals • Why too-wide vs too-narrow IF bandwidth affects intelligibility and noise rejection

💭 Think About

• Compare the approximate bandwidth (in kHz or Hz) normally used for each of the four signal types listed • Think about which mode needs enough room for human voice frequencies, but also benefits from rejecting as much adjacent-channel noise and interference as practical • Ask yourself: which mode is usually associated with IF filters around 2.1–2.7 kHz on marine and amateur HF radios?

✅ Before You Answer

• Know the rough bandwidths: CW is usually very narrow (hundreds of Hz), AM voice (double sideband) is much wider than 2.4 kHz, and FSK RTTY is typically quite narrow • Identify which mode is described in manuals as using 2.4 kHz or similar SSB filter widths • Verify which emission type on HF marine radios typically uses a 2.4 kHz SSB filter for normal operation