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WEATHER SATELLITES APT, DIGITAL and GEOSTATIONARY WEEKLY STATUS.
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Author : Douglas S Deans.
dsdeans@tiscali. co.uk
Sections 1, 3 and 4 have updates.
SECTION 1: POLAR APT REPORT -- 19th June 2006
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Satellite Frequency (MHz) Status Image Quality
NOAA 12 137.500 on good
NOAA 14 137.620 off n/a
NOAA 15 137.500 off see note 5.
NOAA 17 137.620 on good
NOAA 18 137.100 on good
CHANGES SINCE LAST REPORT.
NOAA 15 APT off.
THIS WEEK'S POSSIBLE EVENTS.
None expected.
NOTES.
1. NOAA 9 was permanently deactivated some years ago and is tumbling freely. Unfortunately it has a sporadic carrier on 137.500 (varies quickly according to orientation) and can cause interference to NOAA 12
and NOAA 15. Update 01/05/2006 : No reports of interference for many months.
2. Tiros-N and NOAA 6 are putting a carrier out on 137.500 and will interfere with NOAA 12 and 15 when their footprints overlap. Update 01/05/2006 : No reports of NOAA 6 interference for many months.
3. NOAA 16's APT transmission system failed a few months after launch.
4. NOAA 18's APT frequency was changed as planned on 4th January 2006 at 09.03 UTC. The change was from VTX-2 (137.9125 MHz) to VTX-1 (137.100 MHz).
5. Due to VHF conflict on 137.500 MHz, NOAA 15's APT is off from 19.00 UTC18th June until 19.00 UTC 21st July.
