| # | Callsign | Launch Date | Band | TX Mode | Telemetry | Balloon | PL (g) | Last Signal | Days | Status | Info | Tracking |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 54 | SP3RC-54 | - | 10 m | WSPR + DominoEX4 | SP3RC | 60" transparent | - | - | – | Scheduled | - | - |
| 53 | SP3RC-53 | 2025-11-07 | 10 m | WSPR + DominoEX4 | SP3RC | 60" transparent | 6.08 g | 2025-11-29 | 8 | Flying | - | Track it |
| 52 | SP3RC-52 | 2025-11-07 | 10 m | WSPR + DominoEX4 | SP3RC | 60" transparent | 6.18 g | 2025-11-29 | 8 | Flying | - | Track it |
| 51 | SP3RC-51 | 2025-07-30 | 10 m | WSPR + DominoEX4 | SP3RC | 60" transparent | 6.03 g | 2025-09-12 | – | Lost | - | Track it |
| 50 | SP3RC-50 | 2025-07-01 | 10 m | WSPR + DominoEX4 | SP3RC | 50" transparent | 6.07 g | 2025-07-11 | 8 | Lost |
PCB v16 - The launch took place in the evening. An attempt to record it with a drone was unsuccessful. The balloon began drifting rather quickly and couldn’t be kept in the camera’s view. I will try to capture it during future launches. In the DominoEx4 frame, I am also sending the TCXO frequency correction value.
|
Track it |
| 49 | SP3RC-49 | 2025-06-30 | 10 m | WSPR + DominoEX4 | SP3RC | 50" transparent | 6.36 g | 2025-07-05 | 4 | Lost |
PCB v16 - The launch was successful, but unfortunately air entered the balloon during the hydrogen transfer, so the cruise altitude is only about 8 200 m. A TCXO calibration using the GPS 1 PPS signal has been implemented. It works correctly, but still requires some fine-tuning.
|
Track it |
| 48 | SP3RC-48 | 2025-06-20 | 10 m | WSPR + DominoEX4 | SP3RC | 50" transparent | 27.67 g | 2025-06-21 | 1 | Lost |
PCB v16 - LiFePo4 battery test. Temperature sensor was attached directly to the battery. Transmitted after sunset, but shut down at -20°C. Operated normally the next day, but flew low — only ~9700 m, the weight had an impact. Stopped transmitting below 20° solar elevation, indicating the battery wasn't working effectively. Did not wake up the following day.
|
Track it |
| 47 | SP3RC-47 | 2025-06-03 | 10 m | WSPR + DominoEX4 | SP3RC | 50" silver | 6.64 g | 2025-07-05 | 31 | Lost |
PCB v15 - First flight using the DS18B20 temperature sensor. Seems to work well, but should be insulated. New telemetry format allows for collecting more precise data. After each WSPR transmission, one DominoEX4 frame is sent with accurate location and additional telemetry.
|
Track it |
| # | Callsign | Launch Date | Band | TX Mode | Telemetry | Balloon | PL (g) | Last Signal | Days | Status | Info | Tracking |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 46 | SP3RC-46 | 2025-05-20 | 10m | WSPR + DominoEX4 | SP3RC β | 50" silver | 6.37 | 2025-06-12 | 23 | Lost |
DIY PCB v15 Transmits 3 DominoEX4 frames after each WSPR frame. Performs flawlessly from launch, transmissions work perfectly! Processor temperature is inaccurate — time to add an external sensor. On the first day, TCXO was stable, though there was some fluctuation during ascent.
|
Track it |
| 45 | SP3RC-45 | 2025-05-09 | 10m | WSPR + RTTY | SP3RC α | 50" silver | 6.46 | 2025-05-15 | 6 | Lost |
ℹ️
DIY PCB v15 Transmits 5 RTTY frames after each WSPR frame.
|
Track it |
| 44 | SP3RC-44 | 2025-04-26 | 10m | WSPR | SP3RC α | 50" transparent | 6.5 | 2025-06-06 | 0 | Lost |
ℹ️
DIY PCB v15 New telemetry encoding (custom-made).
|
Track it |
| 43 | SP3RC/3 | 2025-04-02 | 10m | WSPR | ZachTek | 50" silver | 6.15 | 2025-05-05 | 33 | Lost |
ℹ️
DIY PCB v13 No WDT in the MCU, software reset used, self-supporting PVs, HYDROGEN from PEM! Transmitting beautifully from launch, TPL reset works at first, but halfway through day two it stops resetting the MCU! Noticed the DONE pin is floating—this might be the cause.
|
Track it |
| 42 | SP3RC/2 | 2025-03-19 | 10m | WSPR | ZachTek | 50" silver | 8.59 | 2025-03-23 | 4 | Lost |
ℹ️
DIY PCB v13 Transmits beautifully from launch, but the TCXO needs replacement—huge drift! Then a 3-day transmission gap—something’s not right.
|
Track it |
| 41 | SP3RC/1 | 2025-03-10 | 10m | WSPR | ZachTek | 50" silver | 7.69 | 2025-04-21 | 42 | Lost |
ℹ️
DIY PCB v13 Transmits immediately after launch until the end of the day. Does not transmit regularly.
|
Track it |
| 40 | SP3RC/40 | 2025-03-06 | 10m | WSPR | ZachTek | 50" silver | 7.74 | 2025-04-12 | 37 | Lost |
ℹ️
DIY PCB v13 Transmitted immediately after launch until the end of the day. Didn’t wake up after the night.
|
Track it |
| 39 | SP3RC/39 | 2024-11-02 | 20m | WSPR | ZachTek | 32" transparent | 7.89 | NaT | - | Lost |
ℹ️
DIY PCB v11 6x PV vertically + diode and magnet! MCU running at 1 MHz! Launched in the evening after dark. High humidity in the air. Never transmitted.
|
- |
| 38 | SP3RC/38 | 2024-10-25 | 20m | WSPR | ZachTek | 50" transparent | 5.1 | 2024-11-11 | 17 | Lost |
ℹ️
DIY PCB v10
|
Track it |
| 37 | SP3RC/37 | 2024-10-20 | 20m | WSPR | ZachTek | 32" transparent | 5.17 | 2024-11-05 | 16 | Lost |
ℹ️
DIY PCB v10
|
Track it |
| 36 | SP3RC/36 | 2024-10-08 | 20m | WSPR | ZachTek | 50" transparent | 14.78 | 2025-01-18 | 102 | Lost |
ℹ️
DIY PCB v7 First circumnavigation of the Earth on October 22nd, after 14 days of flight!
Second lap on November 5th, another 14 days later! Third lap on November 14th, just 9 days later!!!
3x6x PV vertically in triangle + REG170! MCU running at 2 MHz (16 MHz crystal with 8 pF capacitors).
|
Track it |
| 35 | SP3RC/35 | 2024-10-08 | 20m | WSPR | ZachTek | 32" transparent | 5.34 | 2024-10-24 | 16 | Lost |
ℹ️
DIY PCB v8 6x self-supporting PV + REG170! MCU running at 2 MHz (16 MHz crystal without capacitors).
|
Track it |
| 34 | SP3RC/34 | 2024-09-20 | 20m | WSPR | ZachTek | 32" transparent | 5.62 | 2025-02-01 | 134 | Lost |
ℹ️
DIY PCB v6 Started transmitting after 2 days — fully tested on the ground. Still something's off...
|
Track it |
| 33 | SP3RC/33 | 2024-09-18 | 20m | WSPR | ZachTek | 32" transparent | 5.83 | 2024-09-22 | 4 | Lost |
ℹ️
DIY PCB v6 Started transmitting after 3 days — worked on the ground, but not in the air...
|
Track it |
| 32 | SP3RC/32 | 2024-09-17 | 20m | WSPR | ZachTek | 50" transparent | 5.96 | 2024-12-08 | 82 | Lost |
ℹ️
DIY PCB v6 0.035 mm molybdenum antenna. First signal received after 36 days! (No transmission detected right after launch.)
|
Track it |
| 31 | SP3RC/31 | 2024-09-17 | 20m | WSPR | ZachTek | 50" transparent | 5.53 | 2025-05-12 | 237 | Lost |
ℹ️
DIY PCB v5 0.035 mm molybdenum antenna. First signal received after 60 days! (No transmission detected right after launch.)
|
Track it |
| 30 | SP3RC/30 | 2024-09-06 | 20m | WSPR | ZachTek | 50" transparent | 5.25 | 2024-09-10 | 4 | Lost |
ℹ️
DIY PCB v4 First signal received only above 12 km. GPS has trouble getting a fix when transmitting from both Si5351 output pins.
|
Track it |
| 29 | SP3RC/29 | 2024-09-04 | 20m | WSPR | ZachTek | 50" transparent | 5.25 | NaT | - | Lost |
ℹ️
DIY PCB v4
|
- |
| 28 | SP3RC/27 | 2024-08-30 | 20m | WSPR | ZachTek | 50" transparent | - | 2024-12-21 | 113 | Lost |
ℹ️
DIY PCB v4 First signal received after 7 days, then again after 6 more days, and once more after another 9 days. Likely no GPS fix due to TCXO interference.
|
Track it |
| 27 | SP3RC/26 | 2024-08-29 | 20m | WSPR | ZachTek | 50" transparent | 5.43 | 2024-09-10 | 12 | Lost |
ℹ️
DIY PCB v4 Weak TCXO with significant drift, but still transmitted while riding 230 km/h winds! Flew past Atlanta and splashed down in the Atlantic off the U.S. East Coast.
|
Track it |
| 26 | SP3RC/25 | 2024-08-27 | 20m | WSPR | ZachTek | 50" transparent | 4.62 | 2024-09-02 | 6 | Lost |
ℹ️
DIY PCB v3 First WSPR frame received only at 12 km altitude, then after several days. Transmission confirmed, but decoding issues. Needs an external crystal.
|
Track it |
| 25 | SP3RC/15 | 2024-08-24 | 20m | WSPR | ZachTek | 32" transparent | 4.46 | 2024-11-06 | 74 | Lost |
ℹ️
DIY PCB v3 My first circumnavigation of the Earth! September 12, after 19 days of flight! Second circumnavigation probably on October 1, after 37 days aloft! (18 days for the second lap)
Third circumnavigation probably on October 17, after 53 days aloft! (16 days for the third lap)
Minor drift, good TCXO, but noisy and causing issues with GPS fix.
|
Track it |
| 24 | SP3RC/14 | 2024-08-24 | 20m | WSPR | ZachTek | 32" transparent | - | NaT | - | Lost |
ℹ️
DIY PCB v3 Too strong wind, got stuck in a tree.
|
- |
| 23 | SP3RC/13 | 2024-08-20 | 20m | WSPR | ZachTek | 32" transparent | 5.31 | 2024-08-22 | 2 | Lost |
ℹ️
DIY PCB v3 5×39×19 PV panels, new WSPR setup, GPS time synchronization every frame, BOD 2.7 V + WDT, 0.1 mm main antenna + 0.06 mm braid.
|
Track it |
| 22 | SP3RC/12 | 2024-08-14 | 20m | WSPR | ZachTek | 32" transparent | - | 2024-08-18 | 4 | Lost |
ℹ️
DIY PCB v3 5x52×19 PV panels mounted flat with a crossbar, 0.1 mm main antenna + 0.06 mm braid. Launched in strong wind.
|
Track it |
| 21 | SP3RC/11 | 2024-08-13 | 20m | WSPR | ZachTek | 32" transparent | - | 2024-08-26 | 13 | Lost |
ℹ️
DIY PCB v3
|
Track it |
| 20 | SP3RC/10 | 2024-08-12 | 20m | WSPR | ZachTek | 32" transparent | 6.95 | 2024-08-24 | 12 | Lost |
ℹ️
DIY PCB v3
|
Track it |
| 19 | SP3RC/9 | 2024-08-10 | 20m | WSPR | ZachTek | 32" transparent | - | 2024-08-10 | 0 | Lost |
ℹ️
DIY PCB v3
|
Track it |
| 18 | SP3RC/8 | 2024-08-07 | 20m | WSPR | ZachTek | 32" transparent | - | 2024-08-16 | 9 | Lost |
ℹ️
DIY PCB v1 Landed in Alaska. Longest and farthest flight so far — 55% around the globe. 🙂
|
Track it |
| 17 | SP3RC/7 | 2024-08-07 | 20m | WSPR | ZachTek | 32" transparent | - | 2024-08-10 | 3 | Lost |
ℹ️
DIY PCB v1
|
Track it |
| 16 | SP3RC/6 | 2024-08-06 | 20m | WSPR | ZachTek | 32" transparent | - | 2024-08-09 | 3 | Lost |
ℹ️
DIY PCB v1
|
Track it |
| 15 | SP3RC/5 | 2024-08-06 | 20m | WSPR | ZachTek | 32" transparent | - | 2024-08-06 | 0 | Lost |
ℹ️
DIY PCB v1 First tracker without GPS-based calibration — TCXO only. Finally achieved stable operation. Reached 8,600 m, then started descending. Likely a leak in the balloon envelope.
|
Track it |
| 14 | SP3RC/4 | 2024-07-31 | 20m | WSPR | ZachTek | 32" transparent | 8.2 | 2024-08-05 | 5 | Lost |
ℹ️
DIY PCB v1 Solar panel mounted on a toothpick.
|
Track it |
| 13 | SP3RC/3 | 2024-07-30 | 20m | WSPR | ZachTek | 32" transparent | - | 2024-07-31 | 1 | Lost |
ℹ️
DIY PCB v1
|
Track it |
| 12 | SP3RC/2 | 2024-07-30 | 20m | WSPR | ZachTek | 32" transparent | - | 2024-08-01 | 2 | Lost |
ℹ️
DIY PCB v1
|
Track it |
| 11 | SP3RC/1 | 2024-07-28 | 20m | WSPR | ZachTek | Big Star transp. | - | 2024-07-30 | 2 | Lost |
ℹ️
DIY PCB v1 Red Star balloon with removed envelope coating. Crashed somewhere in Russia. Botched WSPR frequency synchronization with GPS — most frames were out of band.
|
Track it |
| 10 | SP3RC | 2024-07-25 | 20m | WSPR | WB8ELK | 32" silver | - | 2024-07-26 | 1 | Lost |
ℹ️
DIY PCB v1
|
- |
| 9 | SP3RC | 2024-07-21 | 20m | WSPR | WB8ELK | 2 x 32" silver | - | NaT | - | Lost |
ℹ️
Arduino NANO (bare chip) + Si5351 + GPS NEO-6M, powered by 5 × 52×19 mm solar panels. Balloon climbed to 9,500 m and began drifting slowly. Went silent around 18:00 — woke up the next day over Hungary!
|
- |
| 8 | SP3RC | 2024-07-20 | 20m | WSPR | WB8ELK | 2 x 32" silver | - | NaT | - | Lost |
ℹ️
Custom PCB v1 (my design) + ATmega328PB + Si5351 + GPS NEO-6M, powered by 6 × 52×19 mm solar panels. Balloon reached 11,000 m and drifted nicely. Last telemetry frame around 18:00. Did not wake up the next day.
|
- |
| 7 | SP3RC | 2024-07-19 | 20m | WSPR | WB8ELK | 2 x 32" silver | - | NaT | - | Lost |
ℹ️
Custom PCB v1 (my design) + ATmega328PB + Si5351 + GPS NEO-6M, powered by 6 × 52×19 mm solar panels. Total failure — crashed into a spruce tree during launch.
|
- |
| 6 | SP3RC | 2024-07-18 | 20m | WSPR | WB8ELK | 32" silver | - | 2024-07-18 | 0 | Lost |
ℹ️
No info.
|
- |
| 5 | SP3RC | 2024-07-15 | 20m | WSPR | WB8ELK | 32" silver | - | NaT | - | Lost |
ℹ️
Arduino NANO (bare chip) + Si5351 + GPS NEO-6M, powered by 6 × 52×19 mm solar panels. New H2 generator with dryer. Did not transmit — antenna ripped off by pigeons!
|
- |
| 4 | SP3RC | 2024-07-08 | 20m | QRSS DFCW | - | 32" silver | - | 2024-07-08 | 0 | Lost |
ℹ️
Arduino NANO (bare chip, all other components removed) + BMP280 + Si5351, powered by 6 × 52×19 mm solar panels.
|
- |
| 3 | SP3RC | 2024-07-03 | 20m | QRSS DFCW | - | 1m latex | - | 2024-07-03 | 0 | Lost |
ℹ️
Arduino NANO (bare chip, all other components removed) + BMP280 + Si5351, powered by 6 × 52×19 mm solar panels. Max altitude: 12,100 m, min temperature: –20°C
|
- |
| 2 | SP3RC | 2024-07-01 | 20m | QRSS DFCW | - | 1m latex | - | 2024-07-01 | 0 | Lost |
ℹ️
Arduino NANO + BMP280 + Si5351 + 5V step-up converter + 3.7V 1000mAh LiPo battery. Max altitude: 12,400 m, min temperature: –28°C
|
- |
| 1 | SP3RC | 2024-06-08 | 20m | QRSS DFCW | - | 1m latex | - | 2024-06-08 | 0 | Lost |
ℹ️
Arduino NANO + BMP280 + Si5351 + 5V step-up converter + 2 × 3.7V 250mAh LiPo batteries in parallel. Max altitude: 9300 m, min temperature: –28°C
|
- |