Dual-Cavity Bandpass Airband Filter (8-Inch)

112-137 MHz, dual cavity bandpass, 0.5-2 dB IL tunable, > 18 dB return loss, 350 W.

Frequency

112–137 MHz
Power

35 W
Insertion loss

< 0.5 dB
Connector

N-Female
Weight

13 kg

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Specifications

Electrical

Frequency range	112–137 MHz
Power handling	35 W
Insertion loss	<0.5 dB
VSWR (max)	1.5
Impedance	5 Ω

Mechanical

RF connectors	N-Female
Weight	13 kg
Dimensions (H × W × D)	1050 × 482 × 267 mm

Configuration

Cavity Count	2
Cavity Topology	Bandpass (cascaded)
Cavity Diameter Inch	8
Return Loss Db	18
Frequency Stability	0.8 ppm/C
Temperature Range	-30C to +60C
Mounting	19-inch rack

Verified 2026-05-06 · ALUNOR RF Engineering · source: ALUNOR RF Technical Catalogue 2026-01-21

All measurements at 25 °C, 50 Ω, unless otherwise noted.

Why this product

01

Two cavities cascaded for > 18 dB return loss
02

Up to 1.0 dB IL at 350 W continuous
03

Compact 13 kg / 1050 mm chassis

Technical brief

## Construction
Two 8-inch high-Q cavities cascaded for sharper bandpass selectivity than the single-cavity variant. Return loss > 18 dB; insertion loss tunable 0.5-2 dB.
## Where this fits
Aviation receiver sites needing aggressive front-end filtering, collocation environments where out-of-band rejection drives sensitivity loss.