Tfs249A.doc
version 2.0
08.06.2001
VI
TELEFILTER
Measurement condition
Ambient temperature T
A
:
Input power level:
Terminating impedance at f
c
:
input:
output:
23 °C
0 dBm
Filter Specification
TFS 249A
1/5
1,15 kΩ || -6,5 pF
1,05 kΩ || -6,5 pF
Characteristics
Remark:
Reference level for the relative attenuation
arel
of the
TFS 249A
is the minimum of the pass band attenuation
a
min
. It is
defined as the insertion
loss
ae
. The centre frequency
fc
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
f
N
is fixed on
249,6 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
fc
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
fc
.
Data
Insertion loss
(Reference level)
Nominal frequency
Centre frequency
1 dB Bandwidth
3 dB Bandwidth
30 dB Bandwidth
40 dB Bandwidth
Passband ripple
within ± 1,92 MHz
f
N
f
c
ae
typ. value
14,0
-
249,6
4,72
5,71
9,08
9,60
MHz
MHz
MHz
MHz
MHz
-
0,4
10
48
60
35
16
dB
dB
dB
dB
ns
dB
dB
tolerance / limit
max.
20,0
249,6
dB
MHz
min.
max.
min.
3,84
-
-
11,0
1,0
MHz
MHz
dB
Relative attenuation
arel
f
N
f
N
± 1,92 MHz
...
f
N
± 3,08 MHz
f
N
± 5,5
MHz
f
N
± 5,5 MHz
f
N
± 15
MHz
f
N
± 15 MHz
f
N
± 30
MHz
Group delay ripple
within
Return loss:
within
± 1,92 MHz
± 1,92 MHz
max.
min.
min.
min.
max.
min.
1,0
3,0
40,0
50,0
50,0
10,0
dB
dB
dB
dB
ns
dB
Operating temperature range
Temperature coefficient of frequency ( Tc
f
)
*)
Frequency inversion temperature T
o
Storage temperature range
*)
∆f
c(Hz) = Tc
f
(ppm/K²) x (To - T
A
) ² x fTo (MHz)
- 10 °C ... + 80 °C
0,032
32
ppm/ K²
°C
- 30
°C
... + 85
°C
Generated:
Checked/Approved:
VI TELEFILTER
Potsdamer Straße 18
D 14 513 TELTOW / Germany
Tel: (+49) 3328 4784-52 / Fax: (+49) 3328 4784-30
E-Mail:
tft@telefilter.com
Vectron International, Inc.
267 Lowell Road
Hudson, NH 03051 / USA
Tel: (603) 598-0070 Fax: (603) 598-0075
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
VECTRON [ Vectron International, Inc ]
