Understanding Short Range Devices (SRD)

This article explains what SRD is and covers some of the basics of SRD (Short Range Device) technology.

Low power wireless devices are commonly referred to as short range devices, or SRDs. SRDs are designed to operate at low power and cover a relatively short range. They operate on non-interference and non-protected modes.

To select the appropriate SRD, it’s important to perform an interference analysis, considering both the intended frequency band and adjacent bands. SRDs have become popular due to their wide range of applications.

Applications of SRDs

Here are some typical applications of Short Range Devices:

• Local Area Networks (LANs), e.g., HIPERLANs, RLANs
• Alarms
• Telematics
• Auto vehicle identification in Railways
• Alerts based on movement
• Microphones
• RF ID systems
• Very Low power medical implants
• Inductive applications
• Wireless Audio applications

Frequency Bands Used by SRDs

Different frequency bands and ERPs (Effective Radiated Power) are allocated for non-specific and license-free SRDs, particularly in Europe. The tables below outline the frequency bands commonly used.

SRD Frequency Bands - Non-Specific Use

SRD Frequency Bands - License-Free Use