9M2PJU

APRS Passcode Generator

Embed This Generator

Add this generator to your website using the following code:

<iframe src="https://pass.hamradio.my" width="650" height="500" frameborder="0" allowfullscreen></iframe>

Or download the Android APK here: https://github.com/9M2PJU/9M2PJU-APRS-Passcode-Generator/raw/refs/heads/main/9M2PJU-APRS-Passcode-Generator.apk

How It Works

The APRS passcode generator uses a standardized algorithm to create a unique verification code based on your amateur radio callsign. Let's break down the process using the callsign "9M2PJU" as an example:

1. ASCII Conversion

First, each character is converted to its ASCII value:

9 → 57 M → 77 2 → 50 P → 80 J → 74 U → 85

2. Initial Hash Value

We start with a special hash value: 0x73E2 (29666 in decimal)

Fun fact: The value 73 is a CW (Morse code) abbreviation for "best regards" in amateur radio tradition!

3. Bitwise Operations

The algorithm performs bitwise XOR operations on each character:

1. hash ⊕ (ASCII × 256) for each character 2. Result is masked with 0x7FFF (32767)

4. Final Result

The final passcode will be a number between 0 and 32767.

This passcode remains constant for your callsign and is used for:

  • 🔑 Authentication in APRS networks
  • 📡 Configuring APRS devices
  • 🌐 Accessing APRS-IS services
  • 🔒 Validating packet transmissions

This passcode is required for amateur radio APRS authentication and remains constant for your callsign. It's used when configuring APRS devices or software to ensure proper authentication in the amateur radio APRS network.