PTHSonde
A complete, reusable radiosonde system — pressure, temperature, humidity, wind, and GPS, streamed to a desktop ground station with a full sounding analysis.
Requires the PTHSonde Ground Station — sold separately.
Each PTHSonde is built and calibrated to order — tell us how many and when you need them, and we'll confirm your build slot and lead time, usually within one business day. Batch pricing available.
Docs & downloads
Overview
PTHSonde is a compact payload that measures pressure, temperature, and humidity — plus wind, GPS position, and battery health — and streams it over a long-range LoRa link to a one-click desktop ground station.
Highlights
Why it's different
Complete soundings, every flight
A full Skew-T sounding, hodograph, and severe-weather analysis, rendered from your balloon's own data.
Long-range downlink
A long-range LoRa link, tunable across the 902–928 MHz US band, with a ground receiver that plugs into any laptop over USB.
Reusable payload
A rugged, recoverable sonde with a swappable battery and a unique per-unit ID — recover it and fly again.
Specifications
The numbers behind it
Measurement performance
| Air temperature | −70 to +50 °C · ±0.3 °C · 0.01 °C |
| Relative humidity | 0–100 %RH · ±1.8 %RH · 0.1 %RH |
| Barometric pressure | 10–1200 hPa · ±1.5 hPa · 0.01 hPa |
| Pressure altitude (derived) | 0–31 km · ±10 m · 1 m |
| Wind (GPS-derived) | 0–100 m/s · ±0.5 m/s · direction ±5° |
| GPS position | Global · ±2.5 m CEP |
System
| Radio | LoRa · 0.3 kbps |
| Frequency | 902–928 MHz US ISM · 26 selectable channels (915.125 MHz default) |
| Downlink rate | Full telemetry set every 3 s |
| Flight-train mass | ~80 g (payload, battery, line hardware) |
| Operating envelope | Surface to burst |
Ground station
| Receiver | USB serial to any laptop |
| App | Windows app or browser-based app |
| Live views | Skew-T, hodograph, time-series, GFS landing-prediction map |
| Analysis | Full Skew-T & severe-weather panel per flight |
Complete the kit
Goes well with
PTHSonde Ground Station
The receiving end of the PTHSonde link — a 915 MHz LoRa receiver that decodes telemetry in real time and streams it to the desktop app over USB.
PTH100 Sensor Breakout
The PTHSonde's pressure, temperature, and humidity suite as a research-grade I²C breakout — Qwiic plug-and-play, 3.3–16 V input, flown on balloons, drones, and aircraft.
Ground Station Software
The free PTHSonde ground-station app — a live Skew-T workstation with time-series telemetry, full SPC sounding analysis, a GPS map with GFS landing prediction, a balloon fill calculator, and link health.
Ready to talk
Bring PTHSonde to your program
We build to real campaigns. Tell us what you fly and we'll scope it with you.