tfs426.doc

version 1.1

04/99

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Filter specfication

TFS 426

-

1/4

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VI TELEFILTER

Vectron International, Inc.

Potsdamer Straße 18

267 Lowell Road

D 14 513 TELTOW / Germany

Hudson, NH 03051 / USA

Tel: (+49) 3328 4784-52 / Fax: (+49) 3328 4784-30

Tel: (603) 598-0070 Fax: (603) 598-0075

E-Mail: tft@telefilter.com

E-Mail: vti@vtinh.com

VI TELEFILTER reserves the right to make changes to the product(s) and/or information contained herein without notice. No liability is

assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information.

Measurement condition

Construction

Ambient temperature:

23

°C

see page 2

Input power level:

0 dBm

Terminating impedances

for input:

80

Ω || -2.5 pF.

for output:

80

Ω || -2.5 pF

External coil:

72 nH

Characteristics

Remark:

Reference level for the relative attenuation arel of the TFS 426 is the minimum of the pass band attenuation amin. The minimum of the pass band

attenuation amin is defined as the insertion loss ae. The centre frequency fo is the arithmetic mean value of the upper and lower frequencies at the

3 dB filter attenuation level relative to the insertion loss ae. The nominal frequency fN is fixed on 426,4 MHz without tolerance. The given values

for the relative attenuation arel and for the group delay ripple have to be reached at the frequencies given below also if the centre frequency fo is

shifted due to the temperature coefficient of frequency TCf in the operating temperature range and due to a production tolerance for the centre

frequency fo.

D a t a

typ. Value

Tolerance / Limit

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Nominal Frequency

fN

-

426,4

MHz

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Insertion Loss

ae (reference level)

-

max.

5,5

dB

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Pass Band Ripple

fN ± 67,5 kHz

-

max.

1,5

dB

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Relative Attenuation

arel

fN ±

80 kHz

-

max.

3

dB

fN ± 400 kHz ... fN ± 600 kHz

-

min. 15

dB

fN ± 600 kHz ... fN ± 800 kHz

-

min. 30

dB

fN ± 800 kHz ... fN ± 1600 kHz

-

min. 38

dB

fN ± 1600 kHz ... fN ± 3000 kHz

-

min. 42

dB

fN ±

3 MHz ... fN ± 100 MHz

-

min. 50

dB

2 x fN

-

min. 50

dB

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Group Delay Deviation

GDD

fN ± 50 kHz

-

max.

1,2

µs

fN ± 70 kHz

-

max.

1,5

µs

fN ± 100 kHz

-

max.

2,0

µs

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Operating Temperature Range

- 10 °C ... + 70 °C

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Temperature Coefficient of Frequency

TCf

- 0,036 ppm/K²

-

Frequency Inversion Temperature

To

30

°C

-

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Generated:

Checked / approved: