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BRF 70/...-125

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 ø125 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. 4500.
  • High frequency stability on temperature and power.
  • 19” mounting brackets are available as an option.

ORDERING DESIGNATIONS

TYPE PRODUCT NO.
BRF 70/1-125 200001240
BRF 70/2-125 200001941
BRF 70/3-125 200001942

SPECIFICATIONS

ELECTRICAL
MODEL BRF 70/1-125 BRF 70/2-125 BRF 70/3-125
FREQ. RANGE 380 - 470 MHz 380 - 470 MHz 380 - 470 MHz
MAX. INPUT
POWER
300 W @
0.5 dB IL
175 W @
1.0 dB IL
300 W @
1.0 dB IL
175 W @
2.0 dB IL
300 W @
1.5 dB IL
175 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 ø125 x
303 mm
L:125 x W:250 x
H:303 mm
L:125 x W:375 x
H:303 mm
WEIGHT Approx.
1.2 kg
Approx.
3 kg
Approx.
4.2 kg

TYPICAL RESPONSE CURVES

Figure 1

 

Figure 2

 

Figure 3

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