The Add-On Catalog

Stub — section skeleton authored 2026-06-27; prose to follow.

5.1 Add-On Overview

5.2 Base Radio — GPS + LoRa ($49–$59)

5.2.1 Base Radio: what it is

5.2.2 GPS capability

5.2.3 LoRa capability

5.2.4 When to choose Base Radio

5.3 Advanced Radio — GPS + LoRa + External SDR ($149)

5.3.1 What it adds over Base Radio

5.3.2 The external SDR interface

5.3.3 When to choose Advanced Radio

5.4 M.2 Mod — NVMe Storage ($59)

5.5 External WiFi Mod ($39)

5.5.1 External WiFi Mod: what it is

5.5.2 Dual-radio use cases

5.5.3 When to choose External WiFi Mod

5.6 Active Cooling System

5.6.1 Active Cooling System: what it is

5.6.2 When to add Active Cooling

5.7 SD Cards — 128 / 256 / 500 GB

5.8 Barebones Kit ($299)

5.9 3D-Printed Case (DIY) ($49.99)

5.10 Add-On Selection Matrix

Table 1 — 10. Add-On Selection Matrix

Reader profile	M.2 Mod	Base Radio	Advanced Radio	Ext. WiFi	Active Cooling	Notes
Terminal-only field user	Optional	Optional	—	—	—	Lightweight; passive cooling adequate
SDR + amateur radio operator	Recommended	—	Required	Optional	Recommended with M.2	See Vol 8 for SDR detail
Security researcher / pentester	Recommended	—	Optional	Required	Recommended	Dual Wi-Fi + large NVMe for captures
Maker / derivative builder	Optional	Optional	Optional	Optional	Optional	3D-Printed Case likely of interest

5.11 Resources

Table 2 — 11. Resources

Resource	URL
PiFlux add-ons (Carbon Computers)	https://carboncomputers.us/products/pi-flux
Vol 3 — M.2 Storage (full treatment)	../../PiFlux/02-inputs/volume_sources/vol3.md
Vol 4 — Power & Thermal	../../PiFlux/02-inputs/volume_sources/vol4.md
Vol 8 — SDR Capabilities	../../PiFlux/02-inputs/volume_sources/vol8.md