Author Archives: PE0SAT

Atlas V ULTRASat Objects identified

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Ultrasat LauncherAtlas V ULTRASat Objects identified

By using detailed Doppler shift measurements, PA0DLO informs that LightSail is object 90726, ULTRASat 7, without any doubt.

This means that LightSail is actually object 40658, 2015-025H in the JSpOC catalog.

The preliminary initial assignments in the JSpOC catalog for the objects in this launch will need to be corrected:

PSAT = 90720 = ULTRASat 1 = 40652 = 2015-025B
LightSail = 90726 = ULTRASat 7 = 40658 = 2015-025H
BRICSat = 90729 = ULTRASat 10 = 40661 = 2015-025L

Source: PA0DLO, Amsat-BB

Lightsail-A active again

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LightSail was silent for eight days, but she is active again.

During this morning (31-05-2015 09:53 UTC) pass over The Netherlands I first received weak FSK signals and realized that the TLE I was using (ULTRASat2) didn’t match very well so I switched to ULTRASat8 and was able to decode 19 frames.

LghtSail-31052015-0958UTC

2015-05-31 10:03:12.770 UTC: from KK6HIT-1 to N6CP-X (UI, payload: 248 byte)
000 > 00 9C 6C 86 A0 5A B0 00 96 96 6C 90 92 A8 03 03 CC 45 00 00 
020 > F8 00 00 40 00 40 11 11 2D 81 41 93 21 81 41 93 24 C3 50 C6 
040 > 70 00 E4 D5 23 02 00 00 92 41 00 00 94 41 00 00 00 00 00 00 
060 > 00 00 80 99 89 40 F9 0F 29 3D 81 EB 51 40 29 20 2D 3D C0 4F 
080 > 9D 40 06 0E 90 3E A8 01 03 3C 00 00 00 00 A8 01 83 3B 9A 07 
100 > B0 BA BB 34 00 00 74 89 00 00 00 00 00 00 F7 75 00 00 02 00 
120 > 00 00 00 00 00 00 00 00 00 00 1D 39 10 0B 01 B2 07 00 DE 60 
140 > DF 20 DE A0 E0 A0 00 00 00 03 00 03 00 03 00 03 00 03 00 03 
160 > 00 03 00 03 09 8C 6D 30 0F 00 6D 60 08 58 6D 50 0F 30 6C F0 
180 > 14 D0 6C 40 00 50 6D 70 10 B0 6D 00 1C F8 6D 00 1C 00 01 0B 
200 > FB CF 01 15 00 15 00 1A 00 1A 00 20 00 25 00 1F 00 1C 00 18 
220 > 3F 00 3F 00 01 96 00 1A 00 7F 01 18 00 35 00 07 01 8A 00 DB 
240 > 00 25 00 E4 00 25 00 59 00 00 00 00 00 00 00 00 00 00 0F 00 
260 > 40 00 00 80 40

TLE

ULTRASat7 (LIGHTSAIL-A)
1 90726U          15154.58498645 +.00012439 +00000-0 +33532-3 0 00213
2 90726 055.0069 279.7147 0249269 215.8824 234.0970 15.12547949002116>
ULTRASat8
1 90727U          15150.55115000 +.00017130 +00000-0 +45788-3 0 00150
2 90727 055.0112 297.1659 0249189 205.9605 230.4519 15.12499718001507

Download IQ recording
Download kiss file

GRIFEX Update

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MXL (The Michigan Exploration Laboratory) Grifex update: 28-06-2015

Our primary challenge in the past couple of weeks has been cold temperatures aboard the satellite. You may have noticed increased beacon frequency and higher transmit power – this was to keep the battery above the 0 deg. C minimum safe charge temperature.

GRIFEX Battery Temparature

We have completed several more MARINA runs with differing features, however, we are waiting on confirmation from JPL of a good image before we can release any images. Additionally, we have been able to pinpoint increased voltage drops during beacon transmissions as one source of MARINA aborts, so we have applied the appropriate mitigations (no beacons during MARINA runs) in order to reduce the overall number of aborts.

Source: MXL Ops

O/OREOS Telemetry

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O/OREOS Telemetry 28-05-2015 16:53

OOREOS-28052015-1653UTC

O/OREOS, nanosatellite managed by NASA’s Ames Research Center, successfully launched at 5:25 p.m. PST on Friday, Nov. 19, 2010, from Alaska Aerospace Corporation’s Kodiak Launch Complex on Kodiak Island, Alaska.

PSAT PSK31 Telemetry

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PSAT Telemetry 21-05-2015 13:41 UTC PSK31
435.350 NFM – Decoded with DM780

W3ADO-5 beacon B ØØ7  8 44 785 247 +25
W3ADO-5 beacon B ØØ8 93 42 777 247 +25 
W3ADO-5 beacon B ØØ9 87 34 784 247 +26
W3ADO-5 beacon B Ø1Ø 99 37 776 247 +26
W3ADO-5 beacon B Ø11 99 32 782 248 +26
W3ADO-5 beacon B ØØØ 34 45 796 245 +23
W3ADO-5 beacon B ØØ1 9Ø 37 784 249 +25
W3ADO-5 beacon B ØØ2 99 38 775 246 +25 
W3ADO-5 beacon B ØØ3 87 47 779 247 +26
W3ADO-5 beacon B ØØ4 9Ø 48 772 247 +26 
W3ADO-5 beacon B ØØ5 78 23 777 246 +26   
W3ADO-5 beacon B ØØ6 99 38 774 246 +27 
W3ADO-5 beacon B ØØ7 68 38 779 246 +27
W3ADO-5 beacon B ØØ8 99 4D 775 246 +27
W3ADO-5 beacon B ØØ9 68 37 772 246 +26

PSAT-21052015-1334UTC-PSK31

PSAT Beacon specification:

CALL beacon MODE NOF DET AGC VC IC TMP

Where:

CALL identification of the beacon (callsign)
beacon keyword indicating beginning of data
MODE A or B (A – transmitter always on, B – transmitter turns on, if BPSK31 signal is present)
NOF number of frame (0 … 999)
DET percentage of BPSK31 detection (0 … 99%)
AGC percentage of AGC operation (0 … 99%)
VC supply voltage (10 mVolts)
IC power amplifier current (mAmps)
TMP temperature of PA transistor (deg C)

The AGC measured voltage is highly nonlinearly dependent on the input signal, morover the limiting values of measurement vary with temperature of the chip and its supply voltage. Indicative only conversion equation was computed as from 50Ohm generator to input of receiver Pin = 0.472xAGC-113.5 [dBm, %]

Example:

W3ADO-5 beacon B 044 03 24 540 198 +28

It means mode B active, frame number 044, BPSK31 03 %, AGC acting 24%, supply voltage 5.40V, PA current 198mA ant temperature of the PA transistor of +28°C.

Source: PSAT beacon specification

BRICSat-P Telemetry

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BRICSat-P Telemetry 21-05-2015 13:34 UTC

1:Fm BRCSAT To APUSNA  [15:34:09R] 0000000875, 17,674,0,239,754,875,989, 0,110,374,221,110, 27,110,321, 78,  9,  0, 21,294,  0, 14,0.7,-.9,0.5,0.000,0.000,0.000
1:Fm BRCSAT To APUSNA  [15:34:40R] US Naval Academy: BRICSat-P
1:Fm BRCSAT To APUSNA  [15:35:12R] 0000000935, 18,664
1:Fm BRCSAT To APUSNA  [15:35:43R] US Naval Academy: BRICSat-P
1:Fm BRCSAT To APUSNA  [15:36:14R] 0000000995, 18,673,0,222,750,875,989,290,110,403,100,110, 29,110,300, 56,  7,  0, 20,294,  0, 15,0.7,-1.9,0.5,0.000,0.000,0.000
1:Fm BRCSAT To APUSNA  [15:36:46R] US Naval Academy: BRICSat-P
1:Fm BRCSAT To APUSNA  [15:37:17R] 0000001070, 18,651
1:Fm BRCSAT To APUSNA  [15:37:48R] US Naval Academy: BRICSat-P

BRICSat-P-21052015-1334UTC-Spectrum