The UBSEDS21 balloon was built from 50 micron thick PA-EVOH-PE multilayer film and was 1.9 meters in diameter. This size means the longest axis of the balloon and payload combined is more than 2 meters, and so a NOTAM was required and obtained for the launch.

The payload weight was 34.2 grams, and the free lift was 20.2 grams.

The balloon achieved a stable altitude of 15.2 km 4.5 hours into the flight.



Mission

The initial plan was to use UBSEDS21 to contact the International Space Station via APRS on 145.825 MHz. However, the VHF radio on the ISS is out of order (according to some sources, until mid 2018), so this flight is used to test the amplifier and hopefully talk to any APRS enabled satellites.

Solar Panels

A winter launch meant the payload would need to deal with the sun staying low above the horizon during the day. For this reason, sideways facing solar panels were used.

Envelope

A drawing of the envelope used can be found here. The envelope was pre-stretched, from this calculator it appears the resulting envelope had a gamma ratio of almost 2.2.

Transmissions

The balloon transmits approximately once every 30 seconds during the day, and once every 2 minutes at night. The tracker is able to operate at night when the air temperature is warm enough.

UHF 434.6MHz

It uses the error-correcting Contestia 16/1000 mode on 434.610MHz USB.

Some countries do not allow UHF ISM band operation. Therefore UHF is only transmitted outside the red lines on the geofence below.

APRS M0SBU-13 / AD6AM-13

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 is usually +14dBm.

The balloon also transmits on 145.825MHz for APRS satellites. The output power is +26dBm (400mW). For this mode, one packet is transmitted every two minutes during the day, and once every 8 minutes at night.

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.

Results

16th December 2016

The 145.825MHz beacon was received by JA0CAW during a NO-44 / PCSAT pass. However it appears the digipeater on NO-44 was not active at the time. JA0CAW blog.

Map

Statistics

Plots

Resources

Listeners

Thank you to all listeners who tracked this flight!

Total: 609

Callsign Telemetry Lines Received Longest Path
SP9UOB pl 845 368.2km
G8FJG_v gb 816 481.5km
PE1ANS 792 423.2km
G8FJG_v1 gb 785 481.5km
F1OIL fr 764 454.3km
BACKLOG 697
SP9-06-119 pl 664 321.1km
PE2BZ nl 657 443.7km
PB0AHX nl 637 453.2km
SP9RQA pl 637 240.4km
SP9VEY pl 621 228.6km
PA0RPA nl 620 400.9km
ON5LT be 620 338.6km
PE2G nl 616 478.1km
G8KNN gb 611 458.1km
F80106 fr 597 440.0km
SP5NVX pl 586 283.5km
G8DHE-1 gb 584 416.2km
SP5ULN pl 550 327.1km
F5APQ fr 547 324.4km
F4GUK fr 544 340.7km
G6GZH gb 511 479.7km
DutchMillbt nl 496 451.1km
SQ9CWT pl 493 293.7km
F4FKB fr 482 313.8km
PE0SAT nl 473 402.6km
SQ9PPT pl 472 298.8km
SQ5TDW pl 463 234.1km
OM1ATS sk 455 459.0km
UT3BW ua 448 459.9km
PE1BIA nl 399 318.2km
SQ6KIS pl 367 359.9km
SP8CGR pl 316 168.6km
michal_f pl 316 303.1km
g0nzo gb 306 446.6km
SP5NON pl 296 390.7km
F0ERP fr 295 186.7km
UY0LL ua 290 291.6km
sp9cq 282
SQ1GQN pl 274 465.3km
K9VD 254
G8IMN gb 230 477.5km
SP7240SWL pl 228 348.4km
PD0PNQ nl 214 318.0km
OM5KV hu 212 423.5km
swl72 fr 209 497.3km
EA5URJ-10 208
G1BLO gb 206 234.0km
F6AIU fr 199 152.6km
hyde00001 gb 187 266.2km
AK7ME 185
WY7FRV-2 183
G6SSN gb 181 404.5km
F4CQA fr 180 346.4km
SQ5SCU pl 159 241.7km
SDR pl 157 167.0km
VO1JWW-3 155
W3QA-11 152
DK6WX de 147 214.4km
SQ5MJA 146
DEV88 gb 141 324.1km
LZ0DOE 137
BI3OVY-10 133
SQ3MQD pl 129 463.3km
M0SBU gb 127 77.0km
UR5FSV-2 118
WEBER 118
K7KCA-1 117
SQ4BJC pl 111 220.1km
UT3XT-1 109
N0RNB-5 103
LZ1PRO 101
LA6GGA-10 100
VE4GLS 97
VE4ZIM 97
W7QQA-2 96
EA5RCK-10 94
W0ARP 93
LSBRG 92
SQ7FZR-2 91
GERLCH 91
CEDAR 83
KA7O-15 82
BG2UHK-10 81
CARNEY 78
5B4AMD-10 73
EA8URE-1 70
VO1AW 69
VE1GV 68
ED1ZAR-3 67
KI0AU-1 66
VA2RPN 65
UA6HJQ-10 63
EA8BYW 62
BG1TXB-10 62
EA1WS 61
M0NRD gb 61 406.9km
JE8FXJ-10 61
N0PRG 61
W0BSP-10 60
SUNLGT 59
YU0XPI 59
SP7RB-10 58
PROSSR 57
UH9OAM 54
RW4HIF-10 54
WA4USN-5 52
PD5TON nl 52 308.2km
SP7PKI-10 51
N0BSC 50
CT1AKV 48
EA1JL-8 48
VE2RIN-10 47
JR7YOW-10 47
JE0HBT-1 46
UT4UKA-1 46
MILTAN 45
W0FX 44
VE1AIC-2 44
KD0OXW-10 43
VA1ALW 43
N7JYS-3 43
ED1YAP-3 42
K4SOL-10 42
EUGENE 40
WB7GR-10 40
N4ILM-4 40
JF7HQY-10 39
KC0MKS-1 39
YM8KGZ 38
KD0SEM 37
JA7LJQ-10 37
AUBURN 36
TF3SUT-2 36
WF7R-10 36
HUMBOL 35
SR9DOL 35
UT2XQ-1 34
JJ7KRA-10 34
KD7GIZ-10 34
JF7AMK 33
SR5NLK 33
VE7RHD-10 32
RA4FHE-1 32
SA6BSS 32
ED1ZAX-3 32
UR3UT-2 32
EA6VQ-15 32
N7TAU-1 32
SP7YDD 32
SR8NPG 31
W6SCR 31
N7JYS-4 31
N8VKX-10 30
W7BEQ-2 30
N3DXC 30
K2ZA-1 30
VE7CHW 30
VA2CMQ-3 30
BH1SCW-10 29
TOK 29
EA5AHQ-10 29
YO6IOG-10 29
KG5GBH-1 29
KNAPPA 28
2RIVRS 27
CT2GNC-3 27
KB7DZR-10 27
CT1ALX 26
Rosomak pl 26 160.3km
EB5IGQ 25
N7GWT 25
KC9OZA 25
W4TTU 25
K7YD-11 24
9H1US-5 23
KG0AL 23
WA0MFZ-5 23
VE4RRB 23
STUKEL 23
EA5IIE-10 22
VA7ZIM 22
KD0IQK-5 22
LZ0IOS-10 22
SHEEP 20
N7NIX-1 20
WN8Z-4 20
WB0VTM-7 20
WB0EM 20
VE3JJA 20
KB6YAF-10 20
KK7JX-10 20
YO4ISC-10 20
K6MLA-10 20
LZ2AB-4 20
NR3I 20
KB3LVB-1 19
KB0PJH 19
KM0R-1 19
W0JW 19
YU0XUE 19
SQ4RNG-1 19
JH7UAX-10 18
JA8ZQT-10 18
AC0HY 18
SP3KWA-4 18
VE1FAL-10 18
W1ARN-1 18
N9TDE-10 18
K8VE-8 17
W8JTW 17
FRBNKS 17
VE7OGO-1 16
EA5CB-10 16
W1GRE-1 16
KC0HH 16
MAZAMA 16
WX4FLY 16
VE7VIC-14 16
VE7PRT-2 15
JH7JLB 15
WB7QAZ-10 15
SR7NRQ-10 15
KD0YUJ 15
VE7MKF-1 15
BD4KM-10 15
ASHLND 15
EA5URV-10 15
WB4P-10 14
ED4ZAF-3 14
BIRKEN 14
LZ0BGN 14
WB2ZII-15 14
KD0MEQ-5 14
KE9XB-10 14
KJ4HRM-10 13
K8VE-5 13
F4DBS-10 13
K4PCC 13
JA7NR-10 13
SP9UVG-13 13
VE6NH 12
JR9UKF-15 12
ELKO 12
AF7HG-1 12
KB5LZK 12
VE9SC-10 12
VE7RYF-10 12
K7KEZ 12
JA0CAW-6 12
WR4AGC-5 12
EA1URO-10 12
VE7RLE 11
N2MH-15 11
KJ4SPG 11
LZ0BGM 11
KA0NWV 11
SR8NWD 11
ABAJO 11
N3TJJ-11 10
SQ5DAL-5 10
N7OKG-1 10
SR8NZ 10
SEDRO 10
VE7SST-9 10
ON7EQ-10 10
N7SET 10
W3OI 9
KQ4G-1 9
WINTHP 9
WT7T-6 9
N0NPO-2 9
KD5CKP-3 9
VE7VMH 9
SQ5RZP-2 9
NC3Z-1 9
K2RPF-4 9
N9UMJ-10 9
KM4FZA 9
BG3MUF-10 9
N0NB-10 9
LZ0VRC-2 9
N4JJS-3 8
W1TG-1 8
ED1YAN-3 8
BG2YF 8
EA1CHG-5 8
AC4JG-1 8
KC0U-1 8
JA9MIZ-13 8
K3JAE-1 8
SQ5SCX-2 8
K0XK-5 8
KD8LXB-10 8
SQ7PSU-10 8
LZ0DAD 8
VE7PKE 8
N0AGX-12 8
KB1NYT 8
RA4NHY-1 8
N1AFK-13 7
W2GSA-10 7
EB3EHJ-10 7
SP2OFR 7
W8VFR-8 7
W7HR-1 7
W8VFR-11 7
KB6YTD 7
YO4RDJ-10 7
LZ3SP 7
SP8BPX-1 7
W0RC 7
MB7UMS 7
KD8KTS-10 7
BH1NWL-10 7
SR5GK-2 7
W0WTN-10 7
EA5AER-2 7
BASHOR 7
N0PTL 6
WA7NWP-6 6
UA0SNV-1 6
W0ECO 6
VE4DDW 6
JJ8EMJ-3 6
WS0I 6
AC4ZR-5 6
W8HF 6
VE7DID 6
UR0WUA-2 6
SQ4NJQ-1 6
KB7STN-3 6
AE5E-7 6
K7NVH-1 6
SP8EET-4 6
WD4SEN-1 6
K5YVY-1 6
SR2KG 6
WB7FHC-3 6
LZ1LCD-1 6
KC0TAF 5
VE1NWC 5
SR8VS 5
VA3EOD 5
EA4GPU 5
KD8SPV-1 5
JH0ZMR 5
K8GPS-4 5
VE9CRM-10 5
KB0BDN-10 5
JE8HLA-13 5
ED1YCB-3 5
N0NED-10 5
EA8BQD 5
EA5AHQ-12 5
kh2sk 5
KG4NVN-10 5
VO2WL 5
N2NXS 5
RN3DLL-10 5
NB7O-1 5
VE7RXD-9 5
W7NPC-10 5
W2KB-15 5
LZ0BOT-1 4
LZ1OCZ-1 4
W7ALK-13 4
KC0GP-3 4
W8VFR-9 4
W8VFR-4 4
KC2DHU 4
W6BML-1 4
KJ4OKR-10 4
EA5URD-10 4
YO2LOJ-10 4
N3XKU-7 4
VE7ILM-10 4
N4GMF-4 4
KG4PID-14 4
W0KAH 4
KX7DX-10 4
2E0FSI-10 4
NO3B-10 4
KB0NLY-2 4
KB1BVF 4
WA7SUP 4
W7BOZ 4
N0VEK-2 4
KE7UQK-1 4
WQ8M-9 4
KP2L-5 4
LZ0SOF 4
LZ1OI-4 4
SQ5AAG-2 4
KD4NFI-2 4
HOYT 4
SR9SZ 4
HOLLY 4
SP2GG-4 4
AD7UI 4
KB3RRL-4 4
LZ4NY-2 4
K0APR 3
VA3ROM-10 3
SR9NSK 3
CHLSEA 3
W7MB-10 3
N7BAM 3
SQ5LTL-10 3
SP5MG pl 3 337.6km
N3WAX-3 3
W8MRL-10 3
9A7KXP-10 3
KD0SFY 3
JA0YCW-10 3
VE7RBH 3
N7YET 3
W5BE-11 3
K2ZRO-1 3
KC0QWN-10 3
WA7VC-10 3
JE3ZKC 3
VA7HYD-1 3
EB1TK-5 3
KD2TOM 3
MB7USS 3
BALLPT 3
K6NOX-11 3
N9HWO 3
JH7USP 3
JA9DIJ-10 3
UBC39 3
N0EB 3
JE7YZK-10 3
KL3MO-2 3
AF7DX-1 3
SR5NRF 3
N3LLO-3 3
KJ4SNT 3
SQ5RTW-3 3
BOB 3
SR9NRY 3
JR8YJC-13 3
SR5DOT-2 3
OM8AKX-1 3
WA7DRE 3
KB3IUU-10 3
N1SER-1 2
KB3JSV-10 2
IZ6RDB 2
N1IEK-2 2
AB4D 2
KD0PGM 2
VE9GM-10 2
EB1HRW 2
W8VFR-5 2
KE6SLS 2
KE8CPN 2
K8GPS-10 2
VE7SUN-10 2
AH2S-10 2
VE4ZIM-14 2
SP4RUD-1 2
VE7NEK 2
KA0ATT-10 2
KJ4AJP-5 2
OK0DSK-1 2
SQ5MBG-1 2
RW3DKE-1 2
BY1CRA-10 2
CT2IKK-10 2
W4WHP-10 2
WD4IXD-10 2
VE7OTD 2
KS9N-10 2
NQ3U-10 2
BI1HQL-10 2
N0AN-1 2
JA9HZY 2
KD5CKP 2
W4IFI 2
KA0GFC-14 2
KA1UDX-1 2
KB1EJH-1 2
EA8URL-1 2
W3SMD-1 2
KD8AZC 2
RW6HP-10 2
KB1TSO 2
W2SRH 2
BD2OS-10 2
SR4DOS 2
VE7FAA 2
KM5HG 2
BY1WJ 2
N7NMS 2
W3LUZ-1 2
LZ0SMN-1 2
VE2PKG-1 2
KL7AIR-10 2
SR9NDJ 2
N8KLD 2
N7ZEF 2
K8GI-5 1
LZ0BOT-2 1
OE1XTK 1
N1QKP-15 1
KF4YLM-1 1
VA7HXD 1
KC0VZK-10 1
WA3UFN-1 1
W3AD-1 1
AC0RL 1
ON7SD-5 1
W1OEM 1
HOGBAK 1
KB1MOV 1
K6YIL-7 1
ED4YAG-3 1
VE1WN 1
K7MT 1
W4DHW-1 1
SR7NST 1
WC4PEM-10 1
ED1ZAJ-3 1
KB3KBR-1 1
KJ4TDM 1
N4NE-2 1
VA4TW-3 1
AB1OC-10 1
AB0MB-1 1
KB3WCU-10 1
LZ3GH-2 1
K7RE-5 1
KB6RKS 1
IW1DTU 1
KA4VMP-10 1
KB9YVN 1
KC2WBX 1
RDMTN 1
S53XX-10 1
N8GD-1 1
KC2WBX-2 1
WB2ZEX-10 1
KW0RCA-2 1
MB7VB 1
WN3LIF-1 1
KD4BNQ-3 1
ARKAN 1
SR5ZU 1
UR0BVA-1 1
LZ1PKZ 1
W0BZN 1
S59DTB-10 1
KK4NAW 1
WA8ZDL 1
K7RMO-10 1
W0MUD-10 1
KC5TEL-9 1
NG7W 1
WA1GOV-10 1
W7AUW 1
WX0U-2 1
N4KDJ-2 1
N3LLO-2 1
N3LLO-4 1
KC3BHK-1 1
N3TTT 1
KC0MWM 1
UR8US-8 1
N1RCW-2 1
JA9ZQK-10 1
KG7WPQ 1
SR4NWO 1
KO6TH 1
AA0HJ 1
AE7TO-1 1
W7EEE 1
AC7TK 1
NX0P 1
VE7AQW 1
YO6IKB-10 1
BG1CNX-10 1
K5PJ 1
SV2HNH-1 1
WX2NJ-14 1
EA2PY-15 1
UR5KSH 1
BH1VCS-3 1
JR4ENY-10 1
WA6KHG 1
SR5NWU 1
N3XKU 1
K0FJ-8 1
KG4URP-1 1
YO3KYD-10 1
SV6EXB-11 1
EA5HFG-10 1
K7OZD 1
NM4V-1 1
M0REM 1
KJ6IX-5 1
KC3EQT-10 1
JH7JDC 1
WA7FFM-1 1
NA9VY-10 1
BG4IAJ-10 1
SP8EBC-3 1
MB7UHA 1