From: [email-masked] (wxsat mailer)
To: [email-masked]
Date: 95-09-28 02:35:23 EDT

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Subject: GI: Meteosat RFI
From: <[email-masked]> Mike Kenny
Date: Thu, 28 Sep 95 10:54:18 EST

Thanks to all whom replied to my request for Meteosat info.

Here is a summary.

EUMETSAT provides technical documentation on: 

1) EUM TD 01	Meteorological Data Distribution (MDD)
2) EUM TD 02	Meteosat High Resolution Image Dissemination (HRI)
3) EUM TD 02(R) Meteosat HRI Encryption Infrastructure
4) EUM TD 03	Meteosat WEFAX Dissemination
5) EUM TD 04 	Meteosat Data Collection and Retransmission System

The Meteosat RF characteristics are as follows:

RF carrier frequency 	1691.0 MHz (Dissemination Channel A1) & 
			1694.5 MHz (Dissemination Channel A2)

Long term stability	+/1.2 x 10^-5
Short term stabilty	+/- 7 x 10^-9 /sec

Satellite antenna 
polarisation 		Linear, parallel to Equator

EIRP 		 	Channel A1 - +20.5 dBW
(5 degrees elevation) 	Channel A2 - +19.0 dBW

Channel A1 is used for WEFAX and DCP data retransmission
Channel A2 is used for HRI and WEFAX

HRI format
RF carrier modulation	PM/PCM
Modulation Index	1.2 radian +/- 5%
Code format		BiPhase-Low (SP-L)
Bit Rate		166.66 Kbps
RF bandwidth		660 KHz

WEFAX format
RF carrier modulation	AM/FM
Video Bandwidth	  	1600 Hz
Modulation 		Double sideband AM -(white equals max amp)
AM Modulation Index	80 % 
Sub carrier		2400 Hz 
RF Frequency deviation 	9 KHz peak
RF bandwidth		26 KHz

DCP retransmission format
Modulation		PCM (NRZ-L) PSK/FM
Frequency deviation	12.5 KNz peak
Subcarrier		12.5 KHz sine
Bit Rate		12.5 Kbps
Format 			HDLC structure

MDD format
Channel 1		1695.6438 MHz +/- 15.6 KHz
Channel 2		1695.7250 MHz +/- 15.6 KHz
Channel 3		1695.7562 MHz +/- 15.6 KHz
Channel 4		1695.7874 MHz +/- 15.6 KHz
Modulation		PCM/PM/SPL (1.2 rad)
RF signal bandwidth	360 KHz

RAW imager data to DATTS format
RF carrier frequency	1686.833 MHz
Stretched raw image	PCM(SPL)/PM (1.2 rad) @ 166.66 Kbps 
	nominal		+17.1 dBW
	high power	+19.7 dBW
	RF bandwidth	660 KHZ
Burst mode raw image	PCM(NRZ)/PM (1.2 rad) @ 2.7 Mbps
	nominal power	+20.7 dBW
	RF bandwidth	5400 KHZ

Satellite Telemetry format
RF carrier frequency	1675.929 MHz
Modulation		PCM(SPL-PSK)/PM (1.2 rad)
Bandwidth		30 KHz

Satellite Ranging format
 	Ranging uses the Dissemination channels A1 and A2

DCP report format
RF carrier frequencies	1675.181 to 1675.381 MHz
Modulation		PCM (SP-C)/PM (1.05 rad) @ 100 bps per channel
Bandwidth		3 KHz per channel
DCP channels		33 International and 33 Regional

The Current dissemination schedule is available upon request from
EUMETSAT, from dial-up EBB or soon, from their www home page.

As of 1 August 1995, EUMETSAT address is:
	EUMETSAT
	Am Kavalleriesand 31
	64295 Darmstadt
	Germany

	Phone +49.6151.807-7 (switchboard)
	Fax   +49.6151.807-555

--
Mike Kenny
([email-masked])
Satellite Engineering, Bureau of Meteorology, Melbourne, Australia.

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Subject: GI: Meteosat RFI
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