Low-VHF 8-Inch 4-Cavity Duplexer (BR)
30-40 MHz ± 2.5 MHz, 1.5 dB IL @ 350 W (3.0 dB IL @ 150 W), > 90 dB suppression. 4 BR cavities.
-
Frequency30–40 MHz
-
Power35 W
-
Isolation> 9 dB
-
Insertion loss< 1.5 dB
-
ConnectorN-Female
-
Weight55 kg
Specifications
| Frequency range | 30–40 MHz |
|---|---|
| Power handling | 35 W |
| Insertion loss | <1.5 dB |
| Tx-Rx isolation | >9 dB |
| VSWR (max) | 1.5 |
| Impedance | 5 Ω |
| RF connectors | N-Female |
|---|---|
| Weight | 55 kg |
| Dimensions (H × W × D) | 2460 × 482 × 450 mm |
| Cavity Count | 4 |
|---|---|
| Cavity Topology | 4 BR |
| Cavity Diameter Inch | 8 |
| Frequency Stability | 0.8 ppm/°C |
| Temperature Range | -30°C to +60°C |
| Mounting | 19-inch rack |
| Rack Units | 18 |
| Il Power Alt | 3.0 dB @ 150 W |
All measurements at 25 °C, 50 Ω, unless otherwise noted.
Why this product
-
01
Low-VHF specialist — 30-40 MHz with > 90 dB suppression
-
02
Adjustable IL/power: 1.5 dB @ 350 W or 3.0 dB @ 150 W
-
03
8-inch cavities, 18U rack chassis (482 × 450 × 2460 mm)
Technical brief
Built for low-VHF
30-40 MHz operation requires physically larger cavities (8-inch with 2460 mm length per cavity column). This 18U chassis is a low-VHF specialist — used in legacy public-safety, military, and HF/VHF crossover deployments.
Power scaling
Double-rated for IL trade-off: 1.5 dB IL at 350 W, or 3.0 dB IL at 150 W depending on tuning configuration.
Related products
5-Inch 6-Cavity UHF Duplexer (BR)
380-470 MHz, 300 W, > 60 dB @ 4 MHz (10 MHz window), 1.5 dB IL @ 4 MHz. All band-reject.
- Freq
- 380–470 MHz
- Power
- 3 W
- Isolation
- > 6 dB
5-Inch 6-Cavity UHF Duplexer (BPBR)
380-470 MHz, 250 W, > 95 dB suppression, 1.5 dB IL @ 5 MHz separation. 4 BR + 2 BP cavities.
- Freq
- 380–470 MHz
- Power
- 25 W
- Isolation
- > 95 dB
Airband 6-Inch 6-Cavity Duplexer (BPBR)
112-137 MHz, 300 W, > 85 dB suppression, 1.8 dB IL @ 500 kHz separation. 4 BR + 2 BP cavities.
- Freq
- 112–137 MHz
- Power
- 3 W
- Isolation
- > 85 dB
8-Inch 6-Cavity VHF Duplexer (BPBR)
136-175 MHz, 350 W, > 85 dB suppression, 1.8 dB IL @ 500 kHz separation. Premium 8-inch chassis.
- Freq
- 136–175 MHz
- Power
- 35 W
- Isolation
- > 85 dB
6-Inch 6-Cavity VHF Duplexer (BR)
136-175 MHz, 350 W, 60 dB ±1 MHz @ 500 kHz separation, 2.0 dB IL @ 1 MHz. All-band-reject 6 cavity.
- Freq
- 136–175 MHz
- Power
- 35 W
- Isolation
- > 6 dB
6-Inch 6-Cavity VHF Duplexer (BPBR)
136-175 MHz, 300 W, > 85 dB Tx noise suppression, 1.8 dB IL @ 500 kHz separation. 4 BR + 2 BP cavities.
- Freq
- 136–175 MHz
- Power
- 3 W
- Isolation
- > 85 dB
Need a custom configuration?
Talk to an application engineer about variants, custom tuning, or integration into an existing repeater chassis.