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Label Italy FDB/103-N is a 250W triple-cavity FM bandpass filter with N-type connectors, adjustable bandwidth and 50-ohm impedance in a 19-inch 6U rackmount enclosure.
$ 1,081.00 $ 1,138.00
Label Italy FDB/103-N – Triple-Cavity FM Bandpass Filter with N-Type Connectors provides frequency-selective filtering for FM broadcast transmission systems. Rated at 250 W and covering 87.5–108 MHz, it is designed for installation between the transmitter and antenna. Three coupled coaxial cavities provide bandpass filtering, helping reduce unwanted emissions outside the selected transmission passband.
The FDB/103-N uses quarter-wave, high-Q coaxial cavities with variable coupling. This arrangement provides a selective RF path around the required operating frequency, rather than passing the entire FM broadcast band equally. The published −3 dB bandwidth is adjustable within 500–800 kHz. Specify the station frequency and required response when ordering so the filter can be configured appropriately for the installation.
Label Italy FDB/103-N provides N-type input and output connections for integration into a 50-ohm RF transmission chain. The manufacturer specifies VSWR below 1.15:1 and attenuation below 0.8 dB. These figures support assessment of impedance matching and passband loss, but they do not establish a complete rejection curve. Request measured performance at relevant interference frequencies when planning a shared transmitter site.
The filter uses a SurTec 650-treated aluminium body, silver-plated copper internal lines and PTFE insulators. Its 19-inch, 6U format accommodates equipment-rack installation. Published dimensions are 49 × 80 × 26 cm, with a product weight of 18 kg. Confirm dimensional orientation, rack support, connector clearance and the supplied mounting arrangement before installation. The product weight should not be used as gross shipping weight.
