Digital communications offer some advantages over analog systems, including digital compression, better use of radio spectrum, and the ability to deploy error correction in the signal to aid recovery in noisy signal environments.
In areas where signals are distorted or blocked by hills or tall buildings, digital communications offer improvements in getting the signal to the more difficult reception areas. Called “Single Frequency Network” (SFN) by radio and television broadcasters or “Simulcast” by Land Mobile Radio (LMR) operators, this technique improves signal reception, allows for reduced power repeaters and uses less radio or television spectrum.
Satellite Synchronized Time and Frequency for DVB, DMB, ISDB and DMR
The key to SFN and simulcast networks is that the digital signal must be sent from each transmitter at the same time. To achieve this goal, each transmitter site must have a traceable source of precise timing. In most cases this is only practical by using GNSS satellite-derived timing.
Trimble provides several products that meet the needs of digital communications, including modules that can be embedded in transmission products such as MPEG encoders or complete reference units that provide precise time and frequency together with holdover in case of emergencies.
Whatever your needs, including Land Mobile Radio, DVB-T2, DMB-T/H, ISDB-T or ETSI TS 102 361 (DMR), Trimble has timing products to fit your needs.