What is the GRBBETA uplink frequency?

GRBBETA listens on 436.785 MHz (GFSK 9k6) and 145.935 MHz (GFSK 9k6).

What is the GRBBETA downlink frequency?

GRBBETA transmits on 436.785 MHz (GFSK 9k6), 145.935 MHz (GFSK 9k6), 145.935 MHz (GFSK 9k6), 436.785 MHz (GFSK 9k6), 2405.000 MHz (FSK 100k) and 436.785 MHz (CW).

When does GRBBETA pass over my location?

Open GRBBETA on the live map and enter your Maidenhead locator or use GPS: the tracker lists the passes of the next 24 hours with AOS, maximum elevation and LOS, and shifts the frequencies for Doppler.

GRBBETA: Frequencies, Status & Passes

Next passes over your station

Pass times depend on where you are. Track GRBBETA on the live map to see its next passes over your station.

GRBBETA frequencies

Uplink	Downlink	Beacon	Mode
436.785 MHz	436.785 MHz	—	GFSK 9k6
145.935 MHz	145.935 MHz	—	GFSK 9k6
—	145.935 MHz	—	GFSK 9k6
—	436.785 MHz	—	GFSK 9k6
—	2405.000 MHz	—	FSK 100k
—	436.785 MHz	—	CW

Nominal frequencies, without Doppler. The live map shifts them for your station during a pass. Frequencies: SatNOGS DB (modified: working amateur transmitters only, in MHz), CC BY-SA 4.0.

About GRBBETA

GRBBeta is a 2U CubeSat from Slovakia and Hungary, the successor of GRBAlpha, the first CubeSat to detect a gamma-ray burst. It was built with the Technical University of Košice, the Konkoly Observatory in Hungary and the company Spacemanic, and launched on 9 July 2024 on the first flight of the Ariane 6 rocket from Kourou. It carries an improved gamma-ray detector, an experimental UV camera and new attitude-control hardware for future gamma-ray CubeSat constellations.

The amateur payload is a digital repeater in its Murgaš transceiver. It works with 9600 baud GFSK AX.25 packets (G3RUH) on 145.935 MHz and 436.785 MHz; use HA2GRB in the path. An experimental S-band transmitter on 2405 MHz sends data at much higher rates.

Radio amateurs also help the science: when the detector triggers on a gamma-ray event, the satellite reports it in its telemetry, and amateur and SatNOGS stations that receive it pass the alert on to the scientists.

Status

Active: amateurs reported hearing GRBBETA on AMSAT 17 h ago.

From reports filed on AMSAT, last 30 days.

Orbit

Type	Low Earth orbit
Altitude	530–558 km
Inclination	62.0°
Period	95.5 min
TLE epoch	2026-10-28 10:51 UTC

Orbital elements: CelesTrak, checked every 3 hours.

Questions about GRBBETA

What is the GRBBETA uplink frequency?: GRBBETA listens on 436.785 MHz (GFSK 9k6) and 145.935 MHz (GFSK 9k6).
What is the GRBBETA downlink frequency?: GRBBETA transmits on 436.785 MHz (GFSK 9k6), 145.935 MHz (GFSK 9k6), 145.935 MHz (GFSK 9k6), 436.785 MHz (GFSK 9k6), 2405.000 MHz (FSK 100k) and 436.785 MHz (CW).
Is GRBBETA active?: Active: amateurs reported hearing GRBBETA on AMSAT 17 h ago.
When does GRBBETA pass over my location?: Open GRBBETA on the live map and enter your Maidenhead locator or use GPS: the tracker lists the passes of the next 24 hours with AOS, maximum elevation and LOS, and shifts the frequencies for Doppler.

GRBBETA