Edit : 
We have changes to the event schedule!! See the new schedule HERE.
February 13 — 16, 2026: SSTV Image Transmission Planned from SAKHACUBE-CHOLBON (RS18S) CubeSat
From February 13 (09:00 UTC) until February 16 (09:00 UTC), 2026, SAKHACUBE-CHOLBON (RS18S) CubeSat will be transmitting images via SSTV mode.
The event commemorates the Sakha Republic’s Mother Language and Writing Day. A set of 8 digital cards featuring famous writers of the Sakha Republic will be broadcast from the satellite. Following the event, the satellite operations team will publish English and Russian translations of all card texts, along with detailed explanations.
Event Schedule:
- Active Broadcasting: 2026-02-13 09:00 UTC — 2026-02-14 08:59 UTC
- Maintenance: 2026-02-14 09:00 UTC — 2026-02-15 08:59 UTC
- Active Broadcasting: 2026-02-15 09:00 UTC — 2026-02-16 09:00 UTC
I nterval between image transmissions is 180 seconds , Robot36 mode. The schedule may be adjusted depending on the satellite performance (energy balance, transceiver temperature, etc.).
Details on SAKHACUBE-CHOLBON (RS18S) satellite:
- Frequency: 437.350 MHz
- Modes: GMSK 2k4 USP FEC, GMSK 9k6 USP FEC, SSTV Robot36
- Callsign: RS18S
- NORAD SATCAT ID: 67290
- SatNOGS / sonik.space ID: CPWN-2484-4785-1722-0154
- IARU Coordination completed on August 25, 2025
Satellite Overview:
SAKHACUBE-CHOLBON (Russian: МКА «Чолбон») is the first satellite of the Sakha Republic, a 1U CubeSat built around SPUTNIX Orbicraft-Pro bus. Its payload includes a cluster of 12 Arduino-compatible microcontrollers, a scintillation gamma spectrometer, a camera, and a set of sun sensors for an experimental coarse attitude determination algorithm. School students of the Republic will be uploading firmware to the payload microcontrollers to conduct their own experiments.
The spacecraft was launched on December 28, 2025 as a rideshare payload alongside Aist-2T №1, №2 and 49 other satellites. It is jointly operated by Sakha Science Academy and Sakha Aerospace Systems, LLC (YKSA, LLC).
QSL Cards: To confirm signal reception and get a QSL card, please send your reports to amsat@yksa.space.
Email Subject: SAKHACUBE-CHOLBON 13-16 FEB SSTV QSL Request (Your Callsign or Full Name)
Report Form:
- Full Name and Callsign (if applicable)
- Time of Reception (UTC)
- Location (QTH or City/Country)
- Mode (SSTV/Telemetry) and optional details on the rig and software
- Decoded images (as attachments)
- Preferred QSL Card Language (Russian or English)
- Paper Card Request: Indicate whether you wish to receive a paper QSL card (available for those who have received 2 or more unique images).
- Mailing Address: Required only if a paper QSL card is requested.
(6 packets)
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