Question
Why do DX stations often transmit and receive on different frequencies?
Answer Options
- A) Because the DX station may be transmitting on a frequency that is prohibited to some responding stations
- B) To separate the calling stations from the DX station
- C) To improve operating efficiency by reducing interference
- D) All these choices are correct
Correct Answer: D
Explanation
When a rare DX station operates, hundreds or thousands of stations often try to contact them at the same time, resulting in a ‘pileup.’ If the DX station transmits and receives on the same frequency (simplex), the caller’s signals will completely block the DX station’s signal, preventing them from hearing anyone clearly. Operating split frequency (transmitting on one frequency and listening on another) solves this problem.
By operating split, the DX station can transmit on one clear frequency while listening to a wide, clear range of frequencies used by the callers, which serves to separate the calling stations from the DX station and thus improve operating efficiency by reducing interference. In addition, the DX station may use a transmit frequency that is allowed for more license classes than the receive frequency they are listening on, giving more operators an opportunity to call. Therefore, all these choices are correct.
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