T4 · Tiny Telemetry Tracking Transmitter
Straight from your rocket. Rail to recovery.
A uBlox M8 GNSS receiver on board, running GPS and GLONASS concurrently. Position and full RRC4 telemetry, downlinked live.
The receiver
Not just GPS.
The T4 carries a uBlox SAM-M8Q — a 72-channel M8 engine with its own patch antenna, receiving GPS and GLONASS concurrently with SBAS and QZSS augmentation. More birds in view means a faster fix on the pad and quicker reacquisition on the way down.
On the T4, a GNSS receiver listening for signals near −130 dBm sits inches from a transmitter putting out up to 1 watt. The SAM-M8Q answers that with a SAW filter and an LNA built into the module, ahead of its own front end — so the radio that carries your position doesn't drown out the receiver that finds it.
GPS + GLONASS concurrent · SBAS (WAAS / EGNOS) · QZSS · 72 channels
Standalone or paired
A tracker on its own.
Give the T4 a battery and it is a complete GPS locator on its own — exactly the way a T3 flies. Add the RRC4 and the same downlink carries your full flight telemetry alongside position.
If you fly a T3 today, the standalone build is the same idea with a better receiver and more radio behind it — and Vector GS runs your T3 as well, so nothing you already own stops working. The difference is that the T4 does not stop there: the day you add an RRC4, the tracker becomes your telemetry link too.
Pick your range
Two radios. One board.
The T4 takes either a standard 250 mW XBee or the 1 W XR Pro. Same footprint, same mounting — the XR Pro simply buys you a great deal more link.
Standard
XBee Pro S3B
250 mW with the integrated quarter-wave whip, or u.FL for an
external antenna. Powered straight from the RRC4 — one battery
for the whole bay.
Long range
XBee Pro XR
1 W for the flights that go long. Runs its own battery, so
transmit current stays clear of your flight computer.
RF line-of-sight (LOS) is defined as a clear path between your rocket airframe and your receiver. Additional performance losses may be experienced from nearby objects absorbing signal energy, changing the antenna tuning, or blocking/reflecting radio energy. Use the dipoles for most sport flying scenarios, and reserve the high-gain column for extreme high-performance projects.
902–928 MHz ISM · frequency hopping · 250 mW or 1 W
Direct connect
One cable to the RRC4.
A single ZH 1.5 mm jumper links the T4 to your flight computer. Same cable either way — what changes is whether the 3V3 wire is populated.
The 1 watt XR Pro transmitter draws high-current in hard bursts every time it keys up. Sharing that power rail with the RRC4 flight computer was a requirement worth engineering out, so the XR Pro carries its own supply and the link to the RRC4 stays data only.
ZH 1.5 mm jumper · 4-wire for 250 mW · 3-wire for 1 W · same part either way
Where it lands
The other end of the link.
Everything the T4 sends arrives in Vector GS — live on the pad, live through the flight, and still there when you are walking the field.
Get one on the rail
Ready when you are.
Fly it as a standalone GPS locator, or pair it with an RRC4 for the full telemetry downlink. Either way, choose the radio your field calls for.
uBlox SAM-M8Q · 902–928 MHz · 250 mW or 1 W · ZH 1.5 mm to the RRC4