Like UBSEDS14, the UBSEDS15 balloon was built from 50 micron thick PA-EVOH-PE multilayer film and was 1.5 meters in diameter. The payload weight was 20 grams. We used slightly more helium than for UBSEDS14; combined with about 3 grams of deadweight (including the fill inlet) this resulted in 17.2 grams of free lift. This initial float altitude was 11.4km (37,000 ft).



Tracker

The tracker used was a new iteration of our pico-tracker design. Some parts of the board (particularly the SE880 GPS unit) have been re-worked and bodged.

The tracker assembly is painted black to keep it warm during the day.

Transmissions

The balloon transmits approximately once per minute when in daylight.

UHF 434.6MHz

It uses the error-correcting Contestia 16/1000 mode on 434.6MHz USB.

The transmission power on this band was measured to be +6dBm, which is well below the +10dBm limit for ISM band operation. Each packet was preceded by 10 seconds of 1Hz pips for manual alignment and a RSID tone for automatic alignment with suitable software (dl-fldigi for example).

To save power UHF transmissions are only made within the red lines on the geofence below.

APRS M0SBU-11 / AD6AM-11

For many countries the balloon transmits APRS packets on local frequencies. In particular this is 144.8MHz in Europe, 144.66MHz in Japan and 144.39MHz in North America. The output power for this mode was measured at +14dBm.

Some countries do not allow aeronautical mobile operation, which limits the balloon from using the amateur bands. Therefore APRS is only transmitted outside the red lines on the geofence below.

Map


The map above is drawn using data received from UHF and from APRS backlog frames. APRS backlog is where the tracker inserts information about where it was in the past into the comment field of an APRS packet that also contains the current position. This backlog allows the map to be drawn ex post even where there are no receivers.

Straight lines are visible where no data was recorded, usually because the battery voltage was too low.

Statistics

  • Total distance traveled: 50129.2km
  • Great circle distance: 2524.3km
  • Flight duration: 47 days, 10 hours
  • Maximum altitude: 12.1km
  • Countries passed through: gb fr it al gr tr ua pl sk hu ro ru kz ru mn cn kp jp ru us ca is false se fi ru kz ru

Plots

Resources

Listeners

Thank you to all listeners who tracked this flight!

Total: 293

Callsign Telemetry Lines Received Longest Path
UY0LL-1 1109
BACKLOG 921
SP9UOB pl 879 341.1km
LA9UI-2 865
LZ0DAD 660
SP5ULN pl 492 469.4km
SP5IZJ pl 468 365.8km
SP5MG pl 440 463.2km
BG2UHK-10 429
VE4DPR 425
F80106 fr 417 355.5km
SP7THR-1 pl 375 226.9km
UT4UKA-1 370
OM5KV-1 hu 334 409.7km
UZ7HO-10 330
LZ0BGN 322
F1OIL fr 315 386.0km
VE4GLS 300
G8FJG_v gb 297 427.4km
OM1ATS sk 289 445.4km
US5ERV 286
LZ2AB-4 281
OH8HHP fi 277 245.0km
SQ5TDW pl 260 287.9km
YO4ISC-10 249
SP9VEY pl 209 253.6km
F4GRT fr 209 153.4km
OH5XB 207
RW6HP-10 206
OM3WOR sk 205 312.2km
G8JNJ gb 200 357.0km
UR3PAS ua 193 288.2km
G8DXZ gb 175 264.1km
LZ0VRF-1 168
GK4BGQ gb 166 370.8km
YO4RDJ-10 162
W7QQA-2 159
F1OIL/2 fr 158 351.4km
G8KNN gb 155 363.8km
F21061 fr 155 153.6km
LZ1ASO 154
PE1ANS 153 426.6km
VO1QU 150
G1BLO gb 148 177.6km
KB7FSC-1 145
W7REA 141
HA6NN hu 133 117.6km
VO1UM-2 128
F1BEK fr 124 174.2km
WEBER 124
F4FKB fr 124 124.4km
RW4HIF-10 122
THIERRY72 fr 118 120.6km
F1IEE fr 116 331.1km
G1DYQ gb 113 270.2km
OH6UW fi 107 353.5km
DEV88 gb 106 235.3km
VE3JJA 106
F5APQ fr 105 272.7km
K6BJ-3 105
VO1UM-1 104
UT2XQ 103
RW3DKE-1 101
VA3EOD 100
0x17 gb 100 222.1km
F6HTJ fr 99 441.9km
OH7BD 97
TA2AWO 97
UR3UT-2 96
K6MAR-10 94
SQ9CWT pl 93 337.9km
F4FQN fr 93 272.9km
JR8YMH-3 84
SV2HNH-1 84
RV1CJ-12 82
KE0ESG-10 82
W7BEQ-2 80
TF3SUT-2 80
SR7NDK-10 79
f4fqn 79
JH8YIN-10 78
N7GWT 77
YM7KA 70
RA6LFJ-1 70
JM8ACU-10 67
OM3BC sk 67 212.6km
UA6LBJ-1 66
VE3YQK-1 65
YM6MER 64
SV2HRT-6 63
YM7KO 63
YM2KA-5 62
SV2RCK-5 59
IZ7BOJ-11 58
OH5AA 58
JL8SSD-10 57
G0RNU gb 57 293.0km
YM7KK 56
VE2RIN-10 55
KB7STN-3 55
UR0UDS-1 54
KA0NWV 54
KD7GIZ-10 53
TA1CR 52
F5LHI 52
F5MVO fr 52 191.0km
KE6AFE-2 52
JR8IVS-10 51
G8IMN gb 50 309.5km
IC8EPV 49
N0RNB-5 48
RV3ADJ-1 46
SR8NJL 46
OK0DSK-1 46
F6GLS-10 45
KA7O-15 40
LZ2AB 40
W6BHZ-5 39
KR6ZY-15 38
SR5RZP-2 38
ABAJO 38
KC0ISW 37
SR9NRY 36
VA2RPN 36
US9IGY ua 35 358.3km
G4YHE gb 35 193.2km
VA2CMQ-3 35
SV7DMD 35
BG1TXB-10 35
THIERRY 72 fr 33 228.3km
M0SBU gb 33 14.6km
AA5QJ-1 32
TA1ICU 31
WB9VXY 29
F2VI 29
SP7PZS-2 29
N6DGM-10 28
LB0XG 27
VE4TV-10 27
LZ0SMN-1 27
F1ABL fr 27 67.1km
OH2FQV fi 26 389.5km
GWS 26
G7SVI gb 26 50.4km
IR2UBX-11 25
sa6bss se 24 1463.7km
LA7HAA-10 23
SR9DOL 23
SV4FFB-4 23
YO8DHA-10 21
JF8AFA-10 20
M0VPN gb 20 51.6km
W6TZI-1 20
JR8YJC-13 18
BSEDS_Mysterious_Tower 18
JR8YKS-10 17
SR5DRK 17
LZ0BOT-1 16
LZ2AB-1 16
SQ9JYE-1 16
SQ5AAG-6M pl 16 438.8km
BG6CQ 16
OE1SSU-10 15
AL7BX 15
KC0CAU-10 14
TA1AST 13
IR0AAI-12 13
SQ7FZR-2 13
OH5RDF 12
SQ7LQU pl 12 183.9km
N7YET 12
IZ0PMP 12
IQ9PA-13 12
WB7REL 12
K6NLC-5 12
SV6EXB 11
K7YI-4 11
YO8SCT-10 11
SP9UVG-13 10
UA1CCB-5 10
N7ZEF 10
AK7ME 10
KJ6IX-5 10
SP3KWA-5 10
SP8NFE-3 10
BG2YF 10
W7BOZ 9
AA6I-1 9
G0LRD gb 9 237.8km
RA1AMW 9
UR3PHP ua 9 115.8km
VO1BIL 9
VO1AWS 8
KB6RKS 8
OM0OUX-1 8
JH8FWD-10 8
IRONMT-2 8
F4AUY-13 8
SR7NST 8
IR0EF-10 8
JJ8EMJ-3 8
IQ9IL-10 7
OH5AD 7
KE7UQK-1 7
VE4DDW 7
IQ5BA-3 7
WL7BA 7
LZ1OI-4 7
IR2UFW 7
SP2PUT-13 6
SR8NZ 6
SR3NRI 6
KE0ESG 6
SQ6ODL-1 6
VO1JWW-1 6
LZ1PKZ 6
IQ9GD 5
SR7NRQ-10 5
IR0AAA 5
SP9PDF-3 5
ES2MA-2 5
IQ8AY 5
SV6EXB-1 5
SR9NFB 5
SR8NPG 5
SR6NWS 5
WA0MFZ-5 5
K7UHP-1 4
SR5GK-2 4
SP3N 4
SUNSET 4
GERLCH 4
GLNVW-1 4
K6SJC-1 4
IZ8IQN-11 4
SR9NDJ 4
SQ5DAL-2 3
IT9DLN-10 3
OH2FTB-2 3
SQ7PSU-2 3
WA7FFM-1 3
SP8EET-4 3
NG6B-2 3
WT7T-6 2
IK8CEP 2
YO3KXL-10 2
SV2HRT-10 2
SV3RF-10 2
SP7THR pl 2 25.2km
SR9NRK 2
UR5WGN-1 2
OK2KOJ-1 2
F5RGH-10 2
OH3RBE-1 2
LZ0DOE 2
IR5X 2
SQ3KNO 2
OE1SSU-12 2
YO3KYD-10 2
pepino81 fr 2 367.6km
KF7ZTB-2 2
IR0UDY-12 1
YUCCA 1
IT9FDP-10 1
LA6GGA-10 1
SQ5SCX-2 1
OH2EWJ-10 1
IR2AO 1
IK2XDE-6 1
N6VUD 1
LA1KTA 1
OE3VPA 1
JA7LJQ-10 1
LA2MLA 1
SR5DOT-2 1
OH4GVN-1 1
SQ9KFZ-2 1
SQ7EQK-4 1
SR5NLK 1
LD8KV 1
OH2EGI 1
SQ5SUI-1 1
OH4JPS-2 1
SV1UY-5 1
KB0YNA-5 1
OH3TK 1
IR0AAC-10 1
AE5E-7 1
SR4NWU 1
OM3BC-5 1
IW5BFZ 1
LZ0BGM 1
IZ2LRW 1

Interesting Events

24th May

Arrives in California. First packet was through the Point Sur Lighthouse Digipeater (KI6PAU-3).

25th May

1km drop in altitude from 0800Z, recovered by 0930Z. SIGWX CB 460 XXX nearby.