LoRa FAQ: 14 Expert Answers to Your Most Common Questions

Link Labs is a leading manufacturer and integrator of LoRa‑based systems. We receive many inquiries about LoRa, so we’ve compiled the most frequently asked questions to help you understand what LoRa is, what it isn’t, and how it can benefit your projects.

1. What is LoRa and why is it such a powerful technology?

LoRa is a proprietary modulation scheme created by Semtech, implemented in transceiver chips such as the SX1272 and SX1276. It offers high processing gain and low power consumption in a tiny chip‑scale package. Paired with highly integrated base‑station chips (SX1301, SX1257), LoRa enables sophisticated point‑to‑multipoint networks that are both cost‑effective and energy efficient. Learn more about LoRa.

2. How does LoRa differ from SIGFOX, NWave, and other UNB LPWAN technologies?

LoRa is a modulation format and a family of Semtech chips. SIGFOX uses a narrowband BPSK modulation for wide‑area IoT, while NWave employs the Weightless standard, offering similar low‑power capabilities. Other ultra‑narrowband solutions exist, but LoRa remains exclusive to Semtech’s hardware ecosystem.

3. Is LoRa a spread‑spectrum technology?

Yes, LoRa is spread‑spectrum, but not in the direct‑sequence sense. It uses an unmodulated carrier with an FM chirp, which spreads energy across a broader band—akin to M‑ary FSK—providing robustness against interference and multipath.

4. What’s the difference between the SX1272 and SX1276?

• SX1272: Three programmable bandwidths—500 kHz, 250 kHz, 125 kHz—covering 850–1 GHz.
• SX1276: Bandwidths from 500 kHz down to 7.8 kHz, better receive sensitivity, and support for 150 MHz bands, 433 MHz, and 850–1 GHz.

5. Can LoRa operate on frequencies other than 868 MHz and 915 MHz in licensed spectrum?

LoRa modulation can be used across 150 MHz to 1 GHz, including 169 MHz, 433 MHz, and others—even in licensed bands. However, many Semtech chips have gaps in the sub‑GHz range, and the base‑station architecture is optimized for 850 MHz to 1 GHz.

6. What is the Semtech SX1301?

The SX1301 is a baseband processor that accepts 1‑bit I/Q digital samples. It typically pairs with two SX1257 front‑end digitizers, though it can interface with other digital RF modules. This architecture underpins the 8×SX1301 gateway design used by Senet’s network deployments.

7. Why use a commercial module instead of open‑source code?

Using a certified module offers two main advantages:
• Rapid development—no need to write low‑level radio firmware.
• FCC certification—avoids costly testing and compliance work. While open‑source LoRaWAN stacks can transmit and receive packets, many host‑interface features remain incomplete.

8. Do I need a gateway for a few endpoints?

No. For small deployments, you can use standalone modules or chips to create simple point‑to‑point links without a full gateway.

9. Why can’t LoRa be used in a mesh topology?

In theory, it’s possible, but LoRa’s long preambles and variable data rates make it difficult to adapt existing mesh protocols like 802.15.4. Implementing a mesh would require significant engineering effort.

10. Is LoRa only for wide‑area networks?

LoRaWAN, the MAC layer protocol, targets large‑scale public networks. However, LoRa’s physical layer can be employed in a wide range of applications beyond wide‑area networking.

11. Can I plug a LoRa module into an existing RS‑232, cellular, or ZigBee system for extra range?

Almost—host‑interface changes and protocol adjustments are needed to accommodate LoRa’s transmission specifications. Link Labs regularly assists customers in transitioning to LoRa.

12. What is LoRaWAN?

LoRaWAN is a MAC layer protocol designed for scalable, single‑operator public networks using Semtech’s LoRa modulation. It defines channel access, duty‑cycle limits, and end‑to‑end security, making it ideal for large IoT deployments.

13. What is the LoRa Alliance?

The LoRa Alliance is a consortium of companies working to standardize and promote LoRaWAN for wide‑area networks. Link Labs proudly belongs to this community.

14. Can LoRa be used for geolocation?

LoRa can support geolocation to an extent. However, the 125 kHz channel bandwidth limits multipath‑delay resolution, often resulting in errors exceeding two kilometers—especially in urban environments. For detailed strategies, see Wireless Positioning: Implementation Strategies and Sources of Error.

If you’re considering a LoRa solution and have questions, contact us today. We’ll help you leverage LoRa’s range and performance for your IoT needs.