VIDEO: MeshCore Mesh Networking for Ham Radio: Tips, Tricks & Q&A
Sal W6SAL - Updated on: 2026-01-13
Join Eric (W6HS), Robert (N6MRO), and Sal (W6SAL) for our first informal Q&A session exploring MeshCore mesh networking technology. Recorded in January 2026, this session covers the fundamentals of setting up and operating a mesh network for amateur radio and emergency communications.
Key Topics Discussed
Getting Started with MeshCore
The team discusses their journey into MeshCore, which began just three months prior when Eric introduced the technology to the San Jose Simplex Group. Starting with only two nodes, the Bay Area network has grown to nearly 300 nodes.
Critical Setup Requirements:
A home node alone isn’t enough - you need a repeater for effective coverage
Repeaters should be deployed outside your house for optimal signal propagation
Line of sight and antenna placement are crucial at 915 MHz
Unlike Meshtastic, MeshCore nodes don’t constantly repeat - they advertise every 3-4 hours
Hardware Recommendations
The group shares practical experience with:
Heltec V4 nodes - Can achieve 1 watt output with custom firmware
Antenna selection - Higher gain isn’t always better; 5-6 dBi antennas often provide better local coverage than narrow-pattern 8+ dBi antennas
Cable loss - Keep coax runs as short as possible at 900 MHz; mount antennas directly on nodes when feasible
Solar repeater deployments - Essential for expanding network coverage
MeshCore vs. Meshtastic
Key differences explained:
MeshCore uses designated repeaters rather than every node acting as a repeater
Reduces bandwidth saturation and collision issues
Room servers function like bulletin board systems, storing the last 32 messages
Private channels require both parties to be online; room servers allow asynchronous communication
Network Infrastructure
Three types of network components:
Nodes - Your personal device for sending/receiving messages
Repeaters - Dedicated devices that relay traffic (don’t repeat everything like Meshtastic)
Room Servers - Message storage and retrieval system, accessible even when your node was offline
MQTT Bridges:
The team demonstrates using Raspberry Pi devices to create MQTT bridges that feed network traffic to the MeshCore analyzer, allowing real-time packet analysis and troubleshooting.
Troubleshooting Tips
Common issues addressed:
“Sent” without confirmation - Your message isn’t reaching a repeater; you’re out of RF range
Failed messages - Often the confirmation packet fails to return, not the original message
Asymmetric paths - Messages may take different routes going out vs. returning
Dense urban environments - 915 MHz struggles with buildings and trees; elevation and line-of-sight are critical
Tools and Resources
Essential tools mentioned:
MeshCore Analyzer - Web-based packet analyzer for monitoring network traffic
RF Line of Sight - Free tool for point-to-point path analysis using USGS topography
Ubiquiti UISP Design Center - Advanced path prediction using LiDAR data
AI tools (like Gemini) - Can help plan optimal repeater placement based on local topology
Real-World Achievement
Brett from Sonoma County (75 miles north of San Jose) successfully received signals from Sal’s repeater - demonstrating the growing reach of the Bay Area MeshCore network and the potential for long-distance communications, particularly during favorable tropospheric ducting conditions.
FCC Compliance Reminder
The team emphasizes staying within legal limits - directly connecting high-gain antennas to 1-watt transmitters can exceed FCC power limits. Always account for antenna gain in your effective radiated power calculations.
What’s Next
The group plans future sessions focusing on:
Deep dive into the packet analyzer
MQTT bridge setup and configuration
Advanced network troubleshooting
Coordinated repeater deployments
Get Involved
Visit 73mesh.com for more resources on building mesh networks in your area. Whether you’re interested in emergency communications, experimenting with digital modes, or building resilient off-grid networks, MeshCore offers an exciting platform for amateur radio operators.
Special thanks to the San Jose Simplex Group and all the hams contributing to the Bay Area MeshCore network!
73 from W6HS, N6MRO, and W6SAL
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