THIS IS A SIMULATED EMERGENCY TEST GUIDE

2026 ARRL Simulated Emergency Test

Official LoRa Mesh Guide

Saturday, October 3, 2026 9:00 AM–12:00 PM

All traffic associated with this exercise is simulated. Participants should configure and test their equipment before 9:00 AM.

Meshtastic

Radio / Frequency

Region
US
Preset
MediumFast
Slot
45

Channel

Channel Name
Leave completely blank
Security
Unencrypted
Key
AQ==
Channel Role
Primary
Uplink
ON
Downlink
ON
Important: the Primary Public Channel name must remain completely blank.

GPS / Location

Position
Optional
Approximate Location
User preference

MeshCore

Radio / Frequency

Region
Canada, USA
Frequency
910.525 MHz
Bandwidth
62.5 kHz
Spreading Factor
SF7
Coding Rate
CR8

Channel / Network

Channel
Public
Path Hash
2-byte

GPS / Location

Location
Optional — Fixed

Message Handling

Use the same short formal message format on both Meshtastic and MeshCore.

Example Exercise Messages

SET [PRECEDENCE] | TO | FROM | SUBJECT | EXERCISE MESSAGE
SET R | LUIS | NET CONTROL | WJQ517 | CHECKING INTO THE NET.
SET E | PABLO | NET CONTROL | FLOODED | HOUSE FLOODED AT 11805 SW 26TH ST, MIAMI
Precedence
SET E
Exercise Emergency
To
PABLO
From
NET CONTROL
Subject
FLOODED
Message
HOUSE FLOODED AT 11805 SW 26TH ST, MIAMI

Exercise Precedence

R
Routine
W
Welfare
P
Priority
E
Emergency — use only for a simulated life-and-death situation

Why does this guide use SET instead of TEST when sending messages?

Some existing mesh bots automatically respond or send tapbacks when they see the word TEST. Because those bots cannot be changed for this exercise, LoRa traffic will use SET before the precedence and EXERCISE in the message text. This avoids unnecessary automated replies and extra mesh traffic while still making simulated traffic clear to participants.

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Message Length

Recommended: 120 ASCII characters or less
Maximum: 133 characters

Keep messages short and clear. Longer formal traffic should be split into numbered parts only when necessary.

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Before 9:00 AM Checklist

General

  • Check battery or external power.
  • Confirm the antenna is connected.
  • Use a recognizable node or station name.

Meshtastic

  • Confirm Region: US.
  • Confirm MediumFast.
  • Confirm Slot 45.
  • Confirm the Primary Public Channel settings are correct.

MeshCore

  • Confirm Region: Canada, USA.
  • Confirm the listed radio settings and Public channel.
  • Verify 2-byte path hashing.
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Real-World Emergency

If an actual emergency occurs, do not mark it as SET or EXERCISE. Real-world traffic takes priority over exercise traffic.

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Live Network Views

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EmComm Control

MeshMonitor operators may optionally use EmComm Control for check-ins, SITREPs, formal traffic handling, logging, and exercise review.

github.com/maxhayim/meshmonitor-emcomm-control

Use EXERCISE mode during the SET.

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