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| SATELLITE IF CHANNEL FILTERS Features * Tight amplitude and group delay specifications * Consistent 6 dB Insertion Loss across range * Impedance: 75 W * Geometrically symmetric response * Remote filter identification * Passband return loss: > 15 dB A range of bandpass filters for use in 70 MHz I.F. stages of satellite links. Designed to meet the tight amplitude and group delay characteristics necessary for close channel separation as specified in the Eutelsat, Intelsat, Arabsat and Astra templates. A particular feature is the passive logic array which can be interrogated electronically to detect the presence and type of filter. Other templates and different I.F. frequencies considered on request. Table 1 - Amplitude See over FB282 - Eutelsat Full Transponder FB281 - Eutelsat Half Transponder FB296 - Intelsat 17.5 MHz Carrier FB295 - Intelsat 20 MHz Carrier FB294 - Intelsat 30 MHz Carrier FB552 - Arabsat 32 MHz Carrier FB404 - Astra A/3 MHz 9.6 8.0 4.2 4.8 8.0 8.6 6.7 A MHz 28.8 24.0 12.6 14.4 24.0 25.8 20.2 B MHz 36.0 30.0 15.75 18.0 30.0 32.0 25.2 C MHz 45.5 35.0 18.0 20.5 ---37.0 28.9 D MHz 60.0 50.0 26.5 28.0 ---54.0 40.0 a dB 0.6 0.3 0.3 0.3 0.5 0.6 0.2 b dB 2.5 3.0 2.5 2.5 2.5 2.5 2.2 c dB 10.0 7.0 6.5 7.5 ---10.0 8.3 d dB 25 25 25 25 ---25 25 e dB 0.3 0.1 0.1 0.1 0.3 0.3 0.0 Table 2 - Group delay See over FB282 - Eutelsat Full Transponder FB281 - Eutelsat Half Transponder FB296 - Intelsat 17.5 MHz Carrier FB295 - Intelsat 20 MHz Carrier FB294 - Intelsat 30 MHz Carrier FB552 - Arabsat 32 MHz Carrier FB404 - Astra A/3 MHz 9.6 8.0 4.2 4.8 8.0 8.6 6.7 A MHz 28.8 24.0 12.6 14.4 24.0 25.8 20.2 H MHz 33.1 30.0 14.2 16.6 30.0 32.0 24.6 Filter Type FB281 FB282 FB294 FB295 FB296 FB404 FB552 f ns 3 4 6 4 5 2 2 Pins 17 0 0 0 0 0 0 1 g ns 5 6 6 5 5 3 3 18 0 0 0 1 1 1 0 19 0 1 1 0 0 1 1 h ns 15 15 15 15 15 12 12 20 1 0 1 0 1 0 0 A particular feature is the passive logic array which can be interrogated electronically to detect the filter type (see table opposite). Pins 21 and 22 are linked internally and can be used to determine if a filter is present in its mounting slot. Pin 16 is connected to a voltage representing logic 1 and pins 17 to 20 are either connected to this or ground. (c) Faraday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change without notice Fara102 Page 1 of 2 May-99(A) PACKAGE DETAIL Note: For correct operation all the ground pins should be taken to a good earth plane. Faraday Technology Ltd. Croft Road Industrial Estate, Newcastle, Staffordshire ST5 0QZ. England. Fara102 Tel: Fax: Email: Web site: Page 2 of 2 + 44 (0)1782 661501 + 44 (0)1782 630101 sales@faradaytech.co.uk http://www.faradaytech.co.uk May-99(A) |
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