Hytera DMR System Planner
6
1.1 Analog Communication VS Digital
Communication
Analog communication has poor privacy protection. The signal transmitted by an
analog radio can be received by any other analog radio on the same channel. Thus
interference easily occurs in analog communication. However, digital
communication employs some technologies such as color code, which significantly
enhance the interference resistance.
In analog communication, the signal becomes weakened gradually, and thus affects
the coverage. In digital communication, however, the signal can be encrypted and
transmitted in a wider coverage. Signal interference also has a great impact on the
communication coverage: the more the signal interference occurs, the smaller the
coverage becomes.
In analog communication, the transmitting radio transmits on a specified channel
and the receiving radio has to receive the signals on the same channel. In digital
communication, the TDMA technology allows to divide the 12.5kHz channel into two
slots, which can serve as an independent channel. The transmitting radio transmits
on one slot (while the other slot stays idle), and the receiving radio detects the
signaling on both slots and receives signal on the active slot.
In analog communication, the FDMA technology allows multiple subscribers
simultaneously access a channel. However, with TDMA technology, one 12.5kHz
channel is divided into two 6.25kHz slots, and thus the spectrum resource is
expanded; moreover, the RF performance remains the same even though the
channel is divided. Compared with analog products, DMR products can
accommodate more subscribers and thus increases the system scope.
Summary of Contents for PD70X Series
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