Question
When selecting an SSB transmitting frequency, what minimum separation should be used to minimize interference to stations on adjacent frequencies?
Answer Options
- A) 5 Hz to 50 Hz
- B) 150 Hz to 500 Hz
- C) 2 kHz to 3 kHz
- D) Approximately 6 kHz
Correct Answer: C
Explanation
Single Sideband (SSB) voice transmissions typically occupy a bandwidth of about 2.5 \text{kHz} to 3 \text{kHz}. Therefore, when choosing a clear frequency to start an SSB contact, a minimum separation of 2 \text{kHz} to 3 \text{kHz} away from any ongoing contact is recommended. This separation ensures that the main energy of your signal does not overlap with the main signal of an adjacent station.
If the frequency is occupied, a good rule of thumb is to tune your receiver two to three \text{kHz} up or down from the busy spot, listen carefully, and then call CQ there. Since 3 \text{kHz} is the typical full bandwidth of an SSB signal, a 3 \text{kHz} separation ensures you are transmitting cleanly outside of an adjacent signal’s range.
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