Single-Cavity Bandpass Airband Filter (8-Inch)

112-137 MHz, single cavity bandpass, 0.5-2 dB IL tunable, > 14 dB return loss, 350 W.

Frequency

112–137 MHz
Power

35 W
Insertion loss

< 0.5 dB
Connector

N-Female
Weight

8 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	8 kg
Dimensions (H × W × D)	1050 × 482 × 267 mm

Configuration

Cavity Count	1
Cavity Topology	Bandpass
Cavity Diameter Inch	8
Return Loss Db	14
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

Single 8-inch cavity for compact 8 kg footprint
02

> 14 dB return loss across the bandpass window
03

Tunable 0.5-2 dB insertion loss

Technical brief

## Construction
Single 8-inch high-Q cavity bandpass tuned for the airband. Provides clean selectivity with > 14 dB return loss across the operating window.
## Where this fits
Pre-filter for airband receivers in moderately dense RF sites, when a full duplexer is overkill but front-end protection is essential.