Closed fivitti closed 4 years ago
@slawek can this be closed?
Originally posted by Tomek Mrugalski at 2019-11-09T08:47:57.125Z
LGTM.
Originally posted by Tomek Mrugalski at 2019-10-20T18:17:30.018Z
assigned to @slawek
Originally posted by Tomek Mrugalski at 2019-10-20T18:17:35.644Z
closed
Originally posted by Tomek Mrugalski at 2020-01-24T18:26:24.822Z
changed the description
Originally posted by Tomek Mrugalski at 2019-10-20T18:16:52.580Z
mentioned in issue #9
Originally posted by Sławek Figiel at 2019-10-13T16:15:47.861Z
The list of satellites which operate on 137 MHz and has clockwise circular polarization.
Name | Frequency | Bandwidth | Data type | Orbit | Observable in Gdansk |
---|---|---|---|---|---|
NOAA 15 DSB | 137.35 / 137.77 MHz | 46 kHz | DSB | Polar | YES |
NOAA 15 APT | 137.62 MHz | 38 kHz | Meteo, graphics, analog | ||
NOAA 18 DSB | 137.35 / 137.77 MHz | 46 kHz | DSB | Polar | YES |
NOAA 18 APT | 137.9125 MHz | 38 kHz | Meteo, graphics, analog | ||
NOAA 19 DSB | 137.35 / 137.77 MHz | 46 kHz | DSB | Polar | YES |
NOAA 19 APT | 137.1 MHz | 38 kHz | Meteo, graphics, analog | ||
Meteor N2 | 137.1 MHz | 150 kHz | Meteo, graphics, digital | Polar | YES |
Meteor N2-2 | 137.9 MHz | 150 kHz | Meteo, graphics, digital | Polar | NO |
Orbcomm FM13 | Data | YES | |||
Orbcomm FM14 | Data | YES | |||
Orbcomm FM15 | Data | YES | |||
Orbcomm FM18 | Data | YES | |||
Orbcomm FM19 | Data | YES | |||
Orbcomm FM20 | Data | YES | |||
Orbcomm FM113 | Data | YES |
Name | Frequency | Bandwidth |
---|---|---|
Orbcomm S-1 | 137.2000 MHz | 25 kHz |
Orbcomm S-2 | 137.2250 MHz | 25 kHz |
Orbcomm S-3 | 137.2500 MHz | 25 kHz |
Orbcomm S-4 | 137.4400 MHz | 25 kHz |
Orbcomm S-5 | 137.4600 MHz | 25 kHz |
Orbcomm S-6 | 137.6625 MHz | 25 kHz |
Orbcomm S-7 | 137.6875 MHz | 25 kHz |
Orbcomm S-8 | 137.7125 MHz | 25 kHz |
Orbcomm S-9 | 137.8000 MHz | 25 kHz |
Orbcomm S-10 | 137.2875 MHz | 25 kHz |
Orbcomm S-11 | 137.3125 MHz | 25 kHz |
Orbcomm S-12 | 137.5600 MHz | 50 kHz |
Orbcomm Gateway | 137.2000 MHz | 25 kHz |
Name | Highest point altitude | Highest point azimuth | Average transit time | Total transit time |
---|---|---|---|---|
NOAA 15 | 37° +- 27° | 145° +- 112° | 8:21 min +- 2:18 min | 50:06 min |
NOAA 18 | 30° +- 19° | 116° +- 106° | 7:17 min +- 4:09 min | 36:23 min |
NOAA 19 | 32° +- 18° | 181° +- 128° | 7:27 min +- 4:27 min | 44:39 min |
Meteor N2 | 38° +- 9° | 152° +- 129° | 9:51 min +- 35 sec | 29:32 min |
Originally posted by Sławek Figiel at 2019-10-12T18:58:46.720Z
added ~5 label
Originally posted by Tomek Mrugalski at 2019-10-20T18:17:42.458Z
My proposal:
Name | NOAA 18 |
---|---|
Frequency | 137.9125 MHz |
Polarization | Circular right |
Data type | Graphic |
Mean highest elevation | 37 +- 18 degrees |
Mean time of visibility | 4 min +- 1 min 50 sec |
Backup | NOAA 15, Meteor |
I don't found any good UHF satellite over Gdańsk. The best spacecraft to receive in UHF frequencies is IIS, but it isn't observable in Gdańsk. I found a few sats which transmit telemetry using UHF. Polish satellites as Swiatowid or Brite Lem and Heweliusz use UHF, but I don't found any information how we can receive the data.
I found also more satellites using VHF bands. Some useful links:
Originally posted by Sławek Figiel at 2019-10-10T17:21:16.292Z
Currently the only sats that are using APT protocol are NOAA-15, NOAA-18 and NOAA-19. We've received many transmissions from all of them.
Originally posted by Tomek Mrugalski at 2020-01-24T18:26:24.286Z
mentioned in issue #2
Originally posted by Sławek Figiel at 2019-10-10T17:30:25.486Z
changed the description
Originally posted by Sławek Figiel at 2019-10-12T20:30:48.948Z
We need to decide where place the RPi and SDR. We have few options:
On the roof
In this case we put the RPi and SDR on the roof, probably in waterproof box, near (or on) the antenna (far ~0,5 m). It should minimize the noises. But upgrade or manual reset of RPi is hard, because we cannot personally get on the roof. Other problem is communication with RPi. We don't know if we have Ethernet connection. If we don't have a possibility to connect to the network then we need plug the GSM modem to RPi. We know nothing about power supply on the roof too.
In the laboratory
Dr Siwicki says that exists the antenna cable from the roof to one laboratory on 7 level and we probably can use it. But this solution increase the noises. But we will to have a free access to our electronic components.
SDR on the roof, RPi in the laboratory
The noises occur when we work with analog signal. We have analog signal in antenna, between antenna and SDR and partially in SDR. SDR produces digital signal. We may put the antenna and SDR on the roof to convert signal to digital and next lossless transfer it to RPi in the laboratory. The main problem here is length of the cable. Some digital cables have limited length to few meters and it isn't enough. We don't know also if we have a possibility to install this cable.
To Do:
Originally posted in #5 by Sławek Figiel at 2019-10-03T20:26:40.911Z