----

----

----

----

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 – 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 – 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

A/3

MHz

A

MHz

H

MHz

f

ns

g

ns

h

ns

FB282 – Eutelsat Full Transponder

9.6

28.8

33.1

3

5

15

FB281 – Eutelsat Half Transponder

8.0

24.0

30.0

4

6

15

FB296 – Intelsat 17.5 MHz Carrier

4.2

12.6

14.2

6

6

15

FB295 – Intelsat 20 MHz Carrier

4.8

14.4

16.6

4

5

15

FB294 – Intelsat 30 MHz Carrier

8.0

24.0

30.0

5

5

15

FB552 – Arabsat 32 MHz Carrier

8.6

25.8

32.0

2

3

12

FB404 – 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)