Observation 3520040: METOP-C (43689)

Regarding Observation 3520040


can anybody tell why this one failed?
It’s got audio and a waterfall.
This is my first attempt with the HackRF, so any clues would be highly appreciated.

Thank you!


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The audio is only 308 seconds, but the observation is almost 1000 seconds. When the two are off by that much, the observation is automatically vetted as failed.


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That makes sense, Roy - thank you!

I am trying to understand the root cause of the issue.
This is what I have found in /var/log/daemon.log:

Jan 22 20:36:11 sn1925 satnogs-client[361]: OOOO[…]OOOsOsOsOsOs[…]OsOsOsOsOsOsOOOOOOOOOO[…]OOOOOOOOOOOOOOO

Followed by a similar log entry at 20:38:53.

This is the support info:
“versions”: {
“satnogs-client”: “1.4+8.g3dd402e”,
“satnogs-client-ansible”: “202012231828”,
“satnogs-flowgraphs”: “1.3-1”,
“gr-satnogs”: “”,
“gr-soapy”: “2.1.3+8+g16a902fc-1”,
“gnuradio”: “”,
“satnogs-config”: “0.11+3.g3ddb06c”
“state”: {
“is-applied”: true,
“pending-tags”: null
“system”: {
“date”: “2021-01-22T22:52:16.183009+00:00”,
“distribution”: {
“DESCRIPTION”: “Raspbian GNU/Linux 10 (buster)”,
“RELEASE”: “10”,
“CODENAME”: “buster”,
“ID”: “Raspbian”
“pending-updates”: true,
“platform”: {
“system”: “Linux”,
“node”: “sn1925”,
“release”: “5.4.83-v7+”,
“version”: “#1379 SMP Mon Dec 14 13:08:57 GMT 2020”,
“machine”: “armv7l”,
“processor”: “”
“memory”: {
“total”: 969764864,
“available”: 790142976,
“percent”: 18.5,
“used”: 119889920,
“free”: 554962944,
“active”: 241586176,
“inactive”: 127029248,
“buffers”: 24932352,
“cached”: 269979648,
“shared”: 6504448,
“slab”: 27328512
“disk”: {
“total”: 15346831360,
“used”: 3798261760,
“free”: 10900717568,
“percent”: 25.8
“configuration”: {
“enable_iq_dump”: true,
“experimental”: true,
“satnogs_antenna”: “TX/RX”,
“satnogs_api_token”: “[redacted]”,
“satnogs_ppm_error”: “0”,
“satnogs_rf_gain”: “64”,
“satnogs_rx_samp_rate”: “8e6”,
“satnogs_soapy_rx_device”: “driver=hackrf”,
“satnogs_station_elev”: “9”,
“satnogs_station_id”: “1925”,
“satnogs_station_lat”: “53.180318”,
“satnogs_station_lon”: “7.204439”

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The O’s indicate buffer overruns, e.g. the system is not keeping up with the amount of samples coming in.

Since it appears you are running on a Raspberry Pi, and you are running your hackrf at 8 MHz sample rate, i am not surprised. I would suggest running at a smaller sample rate, or not using a raspberry pi.


Thank you, I’ll experiment with a smaller sample rate first.

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It seems to work better now, I’ll keep monitoring.
Thank you for your assistance, and have a great weekend!

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