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BRF 70/...-250

Band-Reject Filters for the 450 MHz Band

  • High power base station band-reject filters for the 380 – 470 MHz range.
  • The use of large ø250 mm cavities means a high Q,
    resulting in a very narrow notch bandwidth.

DESCRIPTION

  • The large dimensions also mean a high power rating.
  • Unloaded Q of a single cavity is approx. 8000.
  • High frequency stability on temperature and power.
  • 19” mounting brackets are available as an option.

ORDERING DESIGNATIONS

TYPE PRODUCT NO.
BRF 70/1-250 200001235
BRF 70/2-250 200001600
BRF 70/3-250 200001668

SPECIFICATIONS

ELECTRICAL
MODEL BRF 70/1-250 BRF 70/2-250 BRF 70/3-250
FREQ. RANGE 380 - 470 MHz 380 - 470 MHz 380 - 470 MHz
MAX. INPUT
POWER
350 W @
0.5 dB IL
200 W @
1.0 dB IL
350 W @
1.0 dB IL
200 W @
2.0 dB IL
350 W @
1.5 dB IL
200 W @
3.0 dB IL
ATTENUATION See figure 1 See figure 2 See figure 3
1 dB NOTCH BANDWIDTH 1 ‰ of fc 1 ‰ of fc 1 ‰ of fc
IMPEDANCE Nom. 50 Ω Nom. 50 Ω Nom. 50 Ω
SWR < 1.5 < 1.5 < 1.5
MECHANICAL
TEMP.
RANGE
RH 0-90%
non-condensing
–30° C →
+60° C
–30° C →
+60° C
–30° C →
+60° C
FREQ.
STABILITY
Approx. 1.5
ppm/° C
Approx. 1.5
ppm/° C
Approx. 1.5
ppm/° C
CONNECTORS N-female N-female N-female
DIMENSIONS ø250 x
400 mm
L:250 x W:500
x H:400 mm
L::250 x W:750
x H:400 mm
WEIGHT Approx.
2.8 kg
Approx.
5.2 kg
Approx.
9.6 kg

TYPICAL RESPONSE CURVES

Figure 1

 

Figure 2
 
Figure 3
 

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