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FM Bandpass Filters

Rev : 02 | Rev date : 20 Jul 2022

RFS bandpass filters for VHF FM Radio are primarily used in multi-channel combiner systems but can also be used to eliminate spurious emissions and increase isolation between co-sited FM Radio services.
The filters are designed for very high reliability, with sliding contacts for tuning positioned at low current density points.
The filters are easily re-tuned in the field, as all tuning adjustments are external.


  • Invar temperature compensation for stable operation
  • Compact design for Tx powers less than 1 kW
  • Vertically oriented inputs and outputs for simple installation

Technical features

General Specifications

Product LineFilter Radio
Product TypeBand II (VHF) FM Bandpass Filter
Filter Type and Size3 Pole, 150mm

Electrical Specifications

Frequency Range MHz87.5 - 108
Impedance Ω50
Input PowerkW

1 (Temp Rise: 30°C)

1.3 (Temp Rise: 40°C)

0.5 (Temp Rise: 30°C)

0.6 (Temp Rise: 40°C)

Insertion LossdB<0.65<0.95
Amplitude ResponsedB

<0.15 at fc ±150kHz

>20 at fc ±800kHz

>26.5 at fc ±1.2MHz

<0.15 at fc ±100kHz

>20 at fc ±400kHz

>25 at fc ±800kHz

Return Loss dB

>32 at fc

>26 at fc ±150 kHz

>30 at fc

>24 at fc ±100 kHz

Group Delayns<30, at fc ±100kHz<60 at fc ±100kHz

Mechanical Specifications

Connectors7-16 DIN Socket
Dimensions (Length)cm (in)59 (23)
Dimensions (Width)cm (in)25 (10)
Dimensions (Height)cm (in)120 (47)
Weightkg (lb)20 (44)

Temperature Specifications

CoolingNatural convection
Max Operating Temperature°C(°F)80 (176)
Ambient Temperature Range°C(°F)-5 to 55 (23 to 131)
Maximum Temperature Rise°C(°F)40 (104)
Humidity%95, non-condensing

External Document Links