AO-73 : Funcube-1

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Rotation Period

09 Apr 2021 = 22.0 seconds (from averaged panel temperatures)
10 Apr 2021 = 28.5 seconds (from averaged panel temperatures)
11 Apr 2021 = 26.9 seconds (from averaged panel temperatures)
12 Apr 2021 = 32.1 seconds (from averaged panel temperatures)
13 Apr 2021 = 36.7 seconds (from averaged panel temperatures)
14 Apr 2021 = 45.7 seconds (from averaged panel temperatures)
15 Apr 2021 = 51.5 seconds (from averaged panel temperatures)

AO-73 continues to rotate about the Z-Z axis in reverse of its normal spin direction, with the Z-Z axis maintaining an irregular movement about AO-73’s offset centre of mass. After reporting on April 10th that AO-73 had snapped from a complex unstable attitude to a less complex and an improved attitude, within 24 hours it had again resumed an unstable attitude again. The recommencement of eclipse periods on April 13th is again exhibiting differing frequency profiles for both the morning and evening passes.

73 de Colin VK5HI.

NORBY LoRa telemetry

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13:47:33 [SX12x8] Starting to listen to Norbi
13:47:33 success!
13:53:04 Packet (143 bytes):
13:53:04 8effffffff0a0601c9354500000000f10f00004a3578cb0c0042524b204d57205645523a30325f31320000000000000e0000ec07000000020c0008f50a82006803000000000000000000000094cec40069233dfb327e2e28250000000000000000000000000004040c0f0f0f0f8f0f00fcfbbffcb2600aec2d020c000c00002
13:53:04 [SX12x8] RSSI: -130.750000 dBm
[SX12x8] SNR: -11.750000 dB
[SX12x8] Frequency error: -10781.458008 Hz
13:55:04 Packet (143 bytes):
13:55:04 8effffffff0a0601c9354700000000f10f00004c35f1cb0c0042524b204d57205645523a30325f31320000000000000e0000ec07000000020e0008f20a82006803000000000000000000000094cec40069233dfbaa7e2e28300000000000000000000000000004040c0f0f0f0f8f0f00fffabffcb26008102e0e0c000c00009
13:55:04 [SX12x8] RSSI: -117.000000 dBm
[SX12x8] SNR: 1.500000 dB
[SX12x8] Frequency error: 2426.404785 Hz
13:57:04 Packet (143 bytes):
13:57:04 8effffffff0a0601c9354900000000f10f00004e3569cc0c0042524b204d57205645523a30325f31320000000000000e0000ec07000000020c0008f20a82006803000000000000000000000094cec40069233dfb227f2e28200000000000000000000000000005040c0f0f0f0f8f0f0000fabffcb260082e2e0e0c000c00000
13:57:04 [SX12x8] RSSI: -124.750000 dBm
[SX12x8] SNR: -5.750000 dB
[SX12x8] Frequency error: 7975.469238 Hz
13:59:04 Packet (143 bytes):
13:59:04 8effffffff0a0601c9354b00000000f10f00005035e1cc0c0042524b204d57205645523a30325f31320000000000000e0000ec07000000020f0008f00a82006c03000000000000000000000094cec40069233dfb9b7f2e282d0000000000000000000000000006040c0f0f0f0f8f0f0000f9bffcb2600a4d2e0e0c000c0000d
13:59:04 [SX12x8] RSSI: -122.500000 dBm
[SX12x8] SNR: -3.500000 dB
[SX12x8] Frequency error: 8751.415039 Hz
14:28:38 Checking for firmware Updates...
15:27:13 [SX12x8] RSSI: -137.000000 dBm
[SX12x8] SNR: -17.000000 dB
[SX12x8] Frequency error: -8743.026367 Hz
15:27:13 [SX12x8] CRC error! Data cannot be retrieved
15:28:38 Checking for firmware Updates...
15:29:13 Packet (143 bytes):
15:29:14 8effffffff0a0601c935a500000000f10f0000aa3502e20c0042524b204d57205645523a30325f31320000000000000e0000ec07000000020a0008f80a82009003000000000000000000000094cec40069233dfbbc942e28230000000000000000000000000003040c0f0f0f0f8f0f00fcfbbffcb2600aba2d0e0c000c0000b
15:29:14 [SX12x8] RSSI: -125.500000 dBm
[SX12x8] SNR: -6.500000 dB
[SX12x8] Frequency error: -3999.268799 Hz
15:31:14 Packet (143 bytes):
15:31:14 8effffffff0a0601c935a700000000f10f0000ac357ae20c0042524b204d57205645523a30325f31320000000000000e0000ec07000000020e0008f60a82009003000000000000000000000094cec40069233dfb34952e28300000000000000000000000000004040c0f0f0f0f8f0f00fefabffcb2600aca2d0e0c000c00005
15:31:14 [SX12x8] RSSI: -125.750000 dBm
[SX12x8] SNR: -6.750000 dB
[SX12x8] Frequency error: 1612.709839 Hz
15:33:14 Packet (143 bytes):
15:33:14 8effffffff0a0601c935a900000000f10f0000ae35f2e20c0042524b204d57205645523a30325f31320000000000000e0000ec07000000020f0008f60a82009003000000000000000000000094cec40069233dfbac952e28230000000000000000000000000005040c0f0f0f0f8f0f00fff9bffcb2600add2d0e0c000c0000c
15:33:14 [SX12x8] RSSI: -117.000000 dBm
[SX12x8] SNR: 0.250000 dB
[SX12x8] Frequency error: 5119.147949 Hz

FEES – LoRa telemetry beacons

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01:39:15 [SX12x8] Starting to listen to FEES
01:39:15 success!
01:50:21 Packet (47 bytes):
01:50:21 00fee52fb0de100d002d3100000100000000ab07cb0bbe084b004d0041004c005700cc0024015f005700480063e276
01:50:21 [SX12x8] RSSI: -115.000000 dBm
[SX12x8] SNR: 4.500000 dB
[SX12x8] Frequency error: -23.068672 Hz
01:52:22 Packet (47 bytes):
01:52:22 00fee52fb054110d002d31000001000000001308360c8d083c00400036003e004000c000360140005f00760078672b
01:52:22 [SX12x8] RSSI: -126.000000 dBm
[SX12x8] SNR: -4.000000 dB
[SX12x8] Frequency error: 4318.036133 Hz

Very first QSO via GRBAlpha digipeater

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Thank you, Robo OM1LD for the first QSO :-)

Callsign: OM9GRB
UNPROTO PATH: CQ
Frequency (Up/Down): 437.025 Mhz +/- Doppler shift
Modulation: 9k6 FSK G3RUH, AX25

More info about the transceiver here:
https://www.copernical.com/product-public/item/20134-nxtrx4-vhf-ufh-radio
or here
https://om3ksi.sk/en/2021/03/18/information-for-radio-amateur-enthusiasts/

fm OM1LD to CQ via OM9GRB-7 ctl UI pid F0
CQ CQ CQ CQ CQ CQ CQ CQ CQ CQ CQ Operator Robo OM1LD = Greetings from Slovakia. UL/DL for Digipeater 437,025 MHz. More on web: Cormorant NXTRX4, 73.\
fm DK3WN to CQ via OM9GRB-7 ctl UI^ pid F0
Hello Robo! best 73 from JN49LR
fm OM1LD to CQ via OM9GRB-7 ctl UI pid F0
CQ CQ CQ CQ CQ CQ CQ CQ CQ CQ CQ Operator Robo OM1LD = Greetings from Slovakia. UL/DL for Digipeater 437,025 MHz. More on web: Cormorant NXTRX4, 73.\
fm DK3WN to OM1LD via CQ OM7GRB ctl UI^ pid F0
Hello Robo! best 73 from JN49LR
fm DK3WN to OM1LD via CQ OM7GRB ctl UI^ pid F0
It's a pleasure to make the 1st QSO via GRBAlpha
fm DK3WN to OM1LD via CQ OM7GRB ctl UI^ pid F0
Thank you so much, Robo! 73 de Mike, DK3WN
fm OM9GRB-15 to CQ ctl UI^ pid F0
rrcAADoGUAAaALj/sf92AOfoQfh/D+H/C/5lAah2j0FY/67+XAEAgBb4d+6SuQAAQFAVAEQ/AACtGAAA0gr6CgQLlgr6CgAAAAAAAAAAAAD+EgAAAACSBmwPe9A=
fm OM1LD to DK3WN via OM9GRB-7 ctl UI pid F0
dear Mike, thank You for QSO- LOC JN88QA


screenshot OM1LD

FEES beacon (LoRa)

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01:50:54 [SX12x8] Starting to listen to FEES
01:50:54 success!
02:01:18 Packet (47 bytes):
02:01:18 00fee52fb086a60c00cd2b00000100000000d907a20b5508ea0040013a016f01ed00510152013a01400198016647bd
02:01:18 [SX12x8] RSSI: -133.000000 dBm
[SX12x8] SNR: -10.000000 dB
[SX12x8] Frequency error: -14053.015625 Hz

AO-73 : Funcube-1

VK5HILeave a comment

Rotation Period

02 Apr 2021 = 17.8 seconds (from averaged panel temperatures)
03 Apr 2021 = 17.1 seconds (from averaged panel temperatures)
04 Apr 2021 = 17.2 seconds (from averaged panel temperatures)
05 Apr 2021 = 17.8 seconds (from averaged panel temperatures)
06 Apr 2021 = 17.8 seconds (from averaged panel temperatures)
07 Apr 2021 = 19.0 seconds (from averaged panel temperatures)
08 Apr 2021 = 720 seconds (from real-time WOD panel temperatures)

This last week AO-73’s attitude was very unstable and the Dzhanibekov effect was possibly noted during a number of passes over VK. At some period on the 8th April AO-73 snapped from a complex unstable attitude to a less complex and an improved attitude.
On April 13th AO-73 will again start to experience eclipse periods.

73 de Colin VK5HI.