Version 1.3
02.10.2000
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tfs228.doc
VI TELEFILTER
Filter specification
TFS 228
1/5
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Measurement condition
Ambient temperature:
Input power level:
terminating impedances
Source:
Load:
25
±
5
5
±
2
°C
dBm
220
Ω
|| -14.3 pF
225
Ω
|| -13.5 pF
Characteristics
Remark:
Reference level for the relative attenuation arel of the TFS 228 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 f
c
is the arithmetic mean value of the upper and lower frequencies at the
1 dB filter attenuation level relative to the insertion loss ae. 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 f
C
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 f
c
.
Data
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5
dB
max.
8,0 dB
ae = amin
Insertion loss
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-
228,6 MHz
Nominal frequency
fN
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Relative attenuation
arel
f
N
............................. f
N
± 665
kHz
0,4
dB
max.
1,0 dB
typ. value
limit
5,73 MHz ... f
N
- 188
MHz
45
dB
min. 40
dB
f
N
-
5,73 MHz ... f
N
+ 72
MHz
45
dB
min. 40
dB
f
N
+
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VSWR ratio
f
N
- 665 kHz ... f
N
+ 665 kHz
1,6 : 1
max.
2:1
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Group delay mean value
f
N
- 665 kHz ... f
N
+ 665 kHz
Group delay ripple
GD
f
N
- 665 kHz ... f
N
+ 665 kHz
710
100
ns
ns
max.
±20
max. 200
ns
ns
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Phase linearity
ϕ
fN ± 0,665 MHz
1,0
°rms
max.
2,5 °rms
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Input power level
-
max. + 10
dBm
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Operating temperature range
- 30
°C
... + 80
°C
Storage temperature range
- 40
°C
... + 85
°C
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- 18 ppm/K
1)
TC
Temperature coefficient
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Note 1) -
∆f
(Hz) = TC (ppm/K) x (T - To) x F
To
(MHz)
Generated:
Checked / approved:
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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 4784-0 / Fax: (+49) 3328 4784-30
Tel: (603) 598-0070 Fax: (603) 598-0075
E-Mail: tft@telefilter.com
E-Mail: vti@vtinh.com
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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.
VECTRON [ Vectron International, Inc ]
