Liaison Letter from SE28 to ETSI/TC-SES

The European Science Foundation is an association of its 67 member research councils and academies in 23 countries. The ESF brings European scientists together to work on topics of common concern, to co-ordinate the use of expensive facilities, and to discover and define new endeavors that will benefit from a co-operative approach
The scientific work sponsored by ESF includes basic research in the natural sciences, the medical and biosciences, the humanities and the social sciences.
The ESF links scholarship and research supported by its members and adds value by cooperation across national frontiers. Through its function as coordinator, and also by holding workshops and conferences and by enabling researchers to visit and study in laboratories throughout Europe, the ESF works for the advancement of European science.

On behalf of European radio astronomers, the ESF Committee on Radio Astronomy Frequencies, CRAF, coordinates activities to keep the frequency bands used by radio astronomers free from interference.

Paris, 9 April 1999

Subject: Unwanted emission levels of AMS(R)S and AMSS terminals (AES) into the RAS frequency band 1610.6-1613.8 MHz

Following TC-SES request to SE28 to propose levels of unwanted emissions of AMS(R)S and AMSS terminals (AES) into the RAS frequency band 1610.6-1613.8 MHz, SE28 proposes the following value of -80 dB(W/MHz) unwanted emission power measured at AES-antenna input (single tone test and two-tone test).

Attached appendix gives relevant background.

It should be noted that existing AES-equipment was type approved on different standards (ICAO MOPS) and should be given due consideration.

The ESF-Committee on Radio Astronomy Frequencies, CRAF, representing all European radio astronomy stations operating in the band 1610.6-1613.8 MHz, expressed concerns on some of the assumptions made towards the derivation of the number proposed. CRAF reserves the option to bring up its concern in a later stage.

Last modified: July 3, 2000