---- ---- ---- ---- satellite if channel filters
features ? tight amplitude and group delay specifications ? geometrically symmetric response ? consistent 6 db insertion loss across range ? remote filter identification ? impedance: 75 w ? 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 C amplitude see over a/3 mhz a mhz b mhz c mhz d mhz a db b db c db d db e db fb282 C eutelsat full transponder 9.6 28.8 36.0 45.5 60.0 0.6 2.5 10.0 25 0.3 fb281 C eutelsat half transponder 8.0 24.0 30.0 35.0 50.0 0.3 3.0 7.0 25 0.1 fb296 C intelsat 17.5 mhz carrier 4.2 12.6 15.75 18.0 26.5 0.3 2.5 6.5 25 0.1 fb295 C intelsat 20 mhz carrier 4.8 14.4 18.0 20.5 28.0 0.3 2.5 7.5 25 0.1 fb294 C intelsat 30 mhz carrier 8.0 24.0 30.0 0.5 2.5 0.3 fb552 C arabsat 32 mhz carrier 8.6 25.8 32.0 37.0 54.0 0.6 2.5 10.0 25 0.3 FB404 C astra 6.7 20.2 25.2 28.9 40.0 0.2 2.2 8.3 25 0.0 table 2 C group delay see over a/3 mhz a mhz h mhz f ns g ns h ns fb282 C eutelsat full transponder 9.6 28.8 33.1 3 5 15 fb281 C eutelsat half transponder 8.0 24.0 30.0 4 6 15 fb296 C intelsat 17.5 mhz carrier 4.2 12.6 14.2 6 6 15 fb295 C intelsat 20 mhz carrier 4.8 14.4 16.6 4 5 15 fb294 C intelsat 30 mhz carrier 8.0 24.0 30.0 5 5 15 fb552 C arabsat 32 mhz carrier 8.6 25.8 32.0 2 3 12 FB404 C astra 6.7 20.2 24.6 2 3 12 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. filter type pins 17 18 19 20 fb281 0 0 0 1 fb282 0 0 1 0 fb294 0 0 1 1 fb295 0 1 0 0 fb296 0 1 0 1 FB404 0 1 1 0 fb552 1 0 1 0 ? 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 faraday technology ltd. tel: + 44 (0)1782 661501 croft road industrial estate, fax: + 44 (0)1782 630101 newcastle, staffordshire email: sales@faradaytech.co.uk st5 0qz. england. web site: http://www.faradaytech.co.uk fara102 page 2 of 2 may-99(a) note: for correct operation all the ground pins should be taken to a good earth plane.
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