What is a problem with a two-frequency simplex system?

What is a problem with a two-frequency simplex system?

• A. Field units hear each other directly
• B. It uses multiple dispatch centers
• C. It transmits on two separate frequencies to avoid interference
• D. Field units cannot hear each other because they are tuned to the dispatch center frequency.

Answer: (D)

In a two-frequency simplex system, there isn’t a common field channel for units to hear one another directly. Instead, each radio uses one frequency to talk to the dispatch center and another frequency to listen to dispatch’s transmissions. Because field units aren’t listening on a shared unit-to-unit channel, they can’t hear each other directly; all communication between units has to go through the dispatch center. This intermediary path can cause delays and coordination challenges.

In a two-frequency simplex system, there isn’t a common field channel for units to hear one another directly. Instead, each radio uses one frequency to talk to the dispatch center and another frequency to listen to dispatch’s transmissions. Because field units aren’t listening on a shared unit-to-unit channel, they can’t hear each other directly; all communication between units has to go through the dispatch center. This intermediary path can cause delays and coordination challenges.