FB281 Datasheet, PDF (1/2 Pages) Faraday Technology – SATELLITE IF CHANNEL FILTERS

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
A/3 A
B
CD a
b
c
d
e
See over
MHz MHz MHz MHz MHz _{dB dB dB dB dB}
FB282 – Eutelsat Full Transponder
9.6 28.8 36.0 45.5 60.0 0.6 2.5 10.0 25 0.3
FB281 – Eutelsat Half Transponder
8.0 24.0 30.0 35.0 50.0 0.3 3.0 7.0 25 0.1
FB296 – 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 – Intelsat 20 MHz Carrier
4.8 14.4 18.0 20.5 28.0 0.3 2.5 7.5 25 0.1
FB294 – Intelsat 30 MHz Carrier
8.0 24.0 30.0 ---- ---- 0.5 2.5 ---- ---- 0.3
FB552 – Arabsat 32 MHz Carrier
8.6 25.8 32.0 37.0 54.0 0.6 2.5 10.0 25 0.3
FB404 – Astra
6.7 20.2 25.2 28.9 40.0 0.2 2.2 8.3 25 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
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.
H
f
g
h
MHz
ns
ns
ns
33.1
3
5
15
30.0
4
6
15
14.2
6
6
15
16.6
4
5
15
30.0
5
5
15
32.0
2
3
12
24.6
2
3
12
Filter Type
FB281
FB282
FB294
FB295
FB296
FB404
FB552
Pins 17 18 19 20
0001
0010
0011
0100
0101
0110
1010
© 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)