What is the second mode of operation for the SINGCARS radio?

The second mode of operation for the SINGCARS radio is frequency hopping. This mode allows for greater security and reduced susceptibility to jamming and interception. In frequency hopping, the radio rapidly changes frequencies within a certain range, making it difficult for unauthorized listeners to capture communications. It enhances operational security by ensuring that the transmissions are less predictable and therefore less vulnerable to enemy detection.

This mode is particularly useful in a combat environment where electronic warfare techniques are common, and it helps maintain secure and reliable communication among units. The first mode, simplex mode, is a one-way communication process, while the other options do not provide the same level of security and operational effectiveness as frequency hopping does.