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Live signal, per antenna
Real-time RSRP, RSRQ and SINR for each antenna, so you can aim and place antennas with confidence.
Desktop app for Windows & Linux
RM520 Monitor
Monitor & configure a Quectel RM520N-GL 5G modem — live signal, band control, dual-SIM failover, GNSS and more.
First run on Windows: if a blue “Windows protected your PC” box appears, click More info → Run anyway. RM520 Monitor is published by alphabeta.systems and is safe — it simply isn’t code-signed yet, so Windows shows a generic warning.
What RM520 Monitor does
RM520 Monitor is a desktop dashboard for the Quectel RM520N-GL 5G modem. It talks to the modem directly over its AT command serial port, giving you a clear, real-time view of your 5G connection and full control over how the modem behaves — without memorising AT commands.
Whether you run the RM520N-GL in a 5G router, a fixed-wireless-access setup, an RV or boat, or on the bench for testing, RM520 Monitor turns raw modem output into live charts, controls and maps. It runs on Windows (self-contained, nothing to install) and on Linux via the cross-platform Java build.
Features
Everything you need to watch and tune the modem.
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5G / NSA band control
Lock or release specific 5G NR and NSA bands to chase the best cell instead of letting the modem wander.
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Dual-SIM failover
Configure and watch failover between two SIMs to keep the link up when one carrier drops.
⚙
APN & operator profiles
Manage APN settings and operator profiles, and switch between them without digging through menus.
◎
GNSS map
Plot the modem's GNSS / GPS position on a live map — handy for mobile and fixed-wireless installs.
⚡
Built-in speed test
Run an internet speed test from inside the app to correlate throughput with signal conditions.
Download
Get RM520 Monitor free.
Windows
A .rar archive with RM520 Monitor.exe and a bundled Java runtime. Extract and run — nothing to install. Windows 11 opens .rar natively; on Windows 10 use 7-Zip or WinRAR.
Cross-platform JAR
Runs anywhere with Java 21+. Launch with java -jar RM520Monitor-1.0.jar.
FAQ
Common questions
What is RM520 Monitor?
A free desktop app for Windows and Linux that monitors and configures a Quectel RM520N-GL 5G modem over its AT serial port — live signal (RSRP/RSRQ/SINR) per antenna, 5G/NSA band control, dual-SIM failover, APN profiles, a GNSS map, and a built-in speed test.
Which modem does it support?
It is built specifically for the Quectel RM520N-GL 5G modem and communicates with it over its AT command serial port.
Is it free?
Yes — free to download and use.
Do I need Java installed?
Not for the Windows download — it bundles its own Java runtime. The cross-platform JAR needs Java 21 or newer.
Does it work on Linux?
Yes. Use the JAR with Java 21+: java -jar RM520Monitor-1.0.jar.