Category Archives: PSAT

PSAT Telemetry

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PSAT Telemetry 03-06-2015 10:53 UTC

1:Fm PSAT To APRSON Via ARISS [12:52:23R] T#444,871,032,130,129,412,00000000
1:Fm PSAT To APRSON Via ARISS [12:52:56R] s#013306,0z200,FGeFGeEGeDGeBGd0GdaGdbGddGddGddGedFe
1:Fm PSAT To APRSON Via ARISS [12:53:24R] T#445,829,357,129,129,411,00000000
1:Fm PSAT To APRSON Via ARISS [12:54:24R] T#446,819,371,129,128,411,00000000
1:Fm PSAT To APRSON Via ARISS [12:59:08R] s#013310,0z200,IbEIaDI0CIABICAID0HE0HFaHFaGFaGF0FF0

PSAT Telemetry

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

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