Ham Radio General Class Practice Test

How should the transceiver audio input be adjusted when transmitting PSK31 data signals?

1. So that the transceiver is at maximum rated output power

2. So that the transceiver ALC system does not activate

3. So that the transceiver operates at no more than 25% of rated power

4. So that the transceiver ALC indicator shows half scale

The correct answer is: So that the transceiver ALC system does not activate

The adjustment of the transceiver audio input when transmitting PSK31 data signals should be done so that the transceiver's Automatic Level Control (ALC) system does not activate. This is crucial because PSK31 is a low-power digital mode that relies on precise signal levels to maintain the integrity of the transmitted data. When the ALC system activates, it can introduce distortion into the signal due to the compression of the audio levels, which can negatively impact the clarity and quality of the transmitted signal. By ensuring that the ALC does not kick in, operators can produce a cleaner and more consistent signal, which is essential for effective communication in digital modes. Proper adjustment prevents overdriving the transceiver, allowing for better reception on the other end and reducing interference with other signals on the band. This method leads to a more efficient use of power and can improve the overall performance of the communication link.