RF Communications Archives - SMC - Antenna and Mast Specialists

HF Series Fixed Station Balun Transformers

The HF Series Fixed Station Balun Transformers are encased in purpose-designed heavy-duty aluminium casings, featuring either solid impregnation or silicone oil cooling, ensuring reliable performance and durability.

Experience unmatched flexibility with the capability to supply any combination of power and impedance ratio across the frequency spectrum from 10 kHz to 32 MHz. Our comprehensive range offers antenna designers a wide array of options. For specific requirements, additional specifications are available upon request.

Key Features:

Broad band coverage from 10 kHz to 2 MHz and 1.5 MHz to 32 MHz, ensuring compatibility with a variety of applications.
Power capacities ranging from 400 Watt to 30 kW, meeting diverse power requirements.
Exceptional efficiency, ensuring optimal performance in your communication setup.
Suitable for all-weather unprotected operation, providing reliability in various environmental conditions.
Sturdy cast aluminum housing, offering durability and longevity for prolonged usage.

Our HF Series Fixed Station Balun Transformers have been expertly designed to elevate your communication experience. Whether for professional or recreational use, these transformers deliver reliable results across a wide range of frequencies and power levels.

HF10 Series – 1 kW HF Wide Band Antenna Matching

Balance Ratio: >26 dB

Balance Terminals: Alumina ceramic M10 thread

Coaxial Connectors: ‘N’ type (others on request)

Configuration: Cast aluminium case (LM25). Hermetically sealed. Epoxy paint finish.

Frequency: 1.5 – 32MHz

High Voltage Protection: Arcing horns and internal static drain (NB No internal capacitors fitted.)

Impedance: See table below

Insertion Loss: <0.3 dB

Load VSWR: 2.5 : 1 max

Power: 1kW average, 4kW peak

Shipping Dimensions: 0.425m x 0.3m x 0.15m

Temperature Range: -40°C to +55°C

VSWR: <1.2 : 1 (2 – 30MHz), <1.3 : 1 (1.5 – 32MHz)

Weight: 5kg

HF100 300/600 High Power Balanced/Balance Matching

Balance Ratio: >26 dB

Balance Terminals: Alumina ceramic M12 thread

Configuration: Cast aluminium case (LM25). Hermetically sealed. Epoxy paint finish.

Cooling: Natural convection, silicone transformer oil, pressure relief valve fitted.

Frequency: 1.5 – 32MHz

High Voltage Protection: Arcing honrs

Input Impedance: 300 ohm balance

Insertion Loss: <0.2 dB

Load VSWR: 2.5 : 1 max

Output Impedance: 200 ohm or 600 ohm balance

Power: 10kW average +100% AM modulation

Shipping Dimensions: 0.7cm x 0.6m x 0.5m

Temperature Range: -40°C to +55°C

VSWR: <1.2 : 1 (2 – 30MHz), <1.3 : 1 (1.5 – 32MHz)

Weight: 60kg gross

HF100 Series – 10 kW HF Wide Band Antenna Matching

Balance Ratio: >26 dB

Balance Terminals: P.T.F.E. M10 thread

Coaxial Connectors: 7/8″, 1 5/8″, 3 1/8″ EIA

Configuration: Cast aluminium case (LM25). Hermetically sealed. Epoxy paint finish.

Cooling: Natural convection, silicone transformer oil, pressure relief valve fitted.

Frequency: 1.5 – 32MHz

High Voltage Protection: Arcing horns and internal static drain

Impedance: See table below

Insertion Loss: <0.2 dB

Load VSWR: 2.5 : 1 max

Power: 10kW average

Shipping Dimensions: 0.7m x 0.6m x 0.5m

Temperature Range: -40°C to +55°C

VSWR: <1.2 : 1 (2 – 30MHz), <1.3 : 1 (1.5 – 32MHz)

Weight: 60kg

HF200 Series – 20 kW HF Wide Band Antenna Matching

Balance Ratio: > 26 dB

Balance Terminals: P.T.F.E. M10 thread

Coaxial Connectors: 1 5/8″, 3 1/8″ EIA

Configuration: Cast aluminium case (LM25). Hermetically sealed. Epoxy paint finish.

Frequency: 1.5 – 32MHz

High Voltage Protection: Arcing horns and internal static drain

Impedance: See table below

Insertion Loss: <0.2 dB

Load VSWR: 2.5 : 1 max

Power: 20kW average

Shipping Dimensions: 0.7m x 0.6m x 0.5m

Temperature Range: -40°C to +55°C

VSWR: <1.2 : 1 (2 – 30MHz), <1.3 : 1 (1.5 – 32MHz)

Weight: 110kg

HF30 Series – 3 kW HF Wide Band Antenna Matching

Balance Ratio: >26 dB

Balance Terminals: P.T.F.E. M10 thread

Coaxial Connectors: 7/8″ EIA (others on request)

Configuration: Cast aluminium case (LM25). Hermetically sealed. Epoxy paint finish.

Frequency: 1.5 – 32MHz

High Voltage Protection: Arcing horns and internal static drain (NB No internal capacitors fitted.)

Impedance: See table below

Insertion Loss: <0.3 dB

Load VSWR: 2.5 : 1 max

Power: 3kW average, 12kW peak

Shipping Dimensions: 0.32m x 0.30m x 0.14m

Temperature Range: -35°C to +55°C

VSWR: <1.2 : 1 (2 – 30MHz), <1.3 : 1 (1.5 – 32MHz)

Weight: 14kg

HF300 Series – 30 kW HF Wide Band Antenna Matching

Balance Ratio: >26 dB

Balance Terminals: P.T.F.E. M10 thread

Coaxial Connectors: 3 1/8″ EIA

Configuration: Cast aluminium case (LM25). Hermetically sealed. Epoxy paint finish.

Frequency: 1.5 – 32MHz

High Voltage Protection: Arcing horns and internal static drain

Impedance: See table below

Insertion Loss: <0.2 dB

Load VSWR: 2.5 : 1 max

Power: 30kW average

Shipping Dimensions: 1m x 0.7m x 0.55m

Temperature Range: -40°C to +55°C

VSWR: <1.2 : 1 (2 – 30MHz), <1.3 : 1 (1.5 – 32MHz)

Weight: 120kg

HF4 Series 400 Watt HF Wide Band Antenna Matching

Balance Ratio: > 26 dB

Balance Terminals: Alumina ceramic M6 thread

Coaxial Connectors: ‘N’ type (others on request)

Configuration: Cast aluminium case (LM25). Hermetically sealed. Epoxy paint finish.

Frequency: 1.5 – 32MHz

High Voltage Protection: Arcing horns and internal static drain (NB No internal capacitors fitted.)

Impedance: See table below

Insertion Loss: <0.3 dB

Load VSWR: 2.5 : 1 max

Power: 400 Watt average, 1600 Watt peak

Shipping Dimensions: 0.22m x 0.15m x 0.12m

Temperature Range: -40°C to +55°C

VSWR: <1.2 : 1 (2 – 30MHz), <1.3 : 1 (1.5 – 32MHz)

Weight: 1.2kg

HF50 Series – 5 kW HF Wide Band Antenna Matching

Balance Ratio: > 26 dB

Balance Terminals: P.T.F.E. M10 thread

Coaxial Connectors: 7/8″ EIA (others on request)

Configuration: Cast aluminium case (LM25). Hermetically sealed. Epoxy paint finish.

Frequency: 1.5 – 32MHz

High Voltage Protection: Arcing horns and internal static drain

Impedance: See table below

Insertion Loss: <0.3 dB

Load VSWR: 2.5 : 1 max

Power: 5kW average, 20kW peak

Shipping Dimensions: 0.49m x 0.41m x 0.39m

Temperature Range: -40°C to +55°C

VSWR: <1.2 : 1 (2 – 30MHz), <1.3 : 1 (1.5 – 32MHz)

Weight: 38kg

HF500/1000 High Power Broadcast Antenna Matching

Balance Ratio: > 26 dB

Balance Terminals: P.T.F.E. M10 thread

Coaxial Connectors: 3 1/8″ and 6 1/8″ EIA

Configuration: Aluminium tank, silicone oil cooled, pressure relief valve fitted

Frequency: 3 – 22MHZ

High Voltage Protection: Arcing horns and internal static drain

Input Impedance: 50 ohm unbalance

Insertion Loss: <0.1 dB

Load VSWR: 2.5 : 1 max

Output Impedance: 200 ohm or 600 ohm balance

Power: HF500 – 50kW average. HF1000 – 100kW average.

Temperature Range: -40°C to +55°C

VSWR: <1.2 : 1

Weight: 450kg

HFC1-30 – 1kW HF Directional Coupler

Connectors: Main line ‘N’ Female. Coupled line ‘BNC’ Female

Coupling Ratio: -30 dB +/- 0.5 dB

Forward/Reverse Discrimination: >30 dB

Frequency: 2 – 50MHz Full specification*

Insertion Loss: <0.1 dB

Max VSWR: 2.5: 1

Notes: N.B. at 1kW the forward output signal is 1 Watt. *The coupler is effective over a very much wider frequency range with a small degradation in performance. Calibration charts can be supplied for those out of band frequencies, where for example, measurement of harmonics is desired.

Power Rating: 1kW continuous. 2.5kW peak

Return Loss (Matched Load): 26.5 dB

HFC10-26 – 10kW HF Directional Coupler

Connectors: Main line 1 7/8″. Coupled line – ‘N’ female

Coupling Ratio: -26 dB +/- 0.5 dB

Forward/Reverse Discrimination: >30 dB

Frequency: 2 – 32MHz Full specification*

Insertion Loss: <0.1 dB

Max VSWR: 2.5: 1

Notes: At 30kW the forward output signal is 75 Watt. *The coupler is effective over a very much wider frequency range with a small degradation in performance. Calibration charts can be supplied for those out of band frequencies, where for example, measurement of harmonics is desired.

Power Rating: 30kW continuous and peak

Return Loss (Matched Load): 26.5 dB

HFC30-26 – 30kW HF Directional Coupler

Connectors: Main line 1 5/8″. Coupled line – ‘N’ female

Coupling Ratio: -26 dB +/- 0.5 dB

Forward/Reverse Discrimination: >30 dB

Frequency: 2 – 32MHz Full specification*

Insertion Loss: <0.1 dB

Max VSWR: 2.5: 1

Notes: N.B. at 30kW the forward output signal is 75 Watts. The coupler is effective over a very much wider frequency range with a small degradation in performance. Calibration charts can be supplied for those out of band frequencies, where for example, measurement of harmonics is desired.

Power Rating: 30kW continuous and peak

Return Loss (Matched Load): 26.5 dB

HFH2-1 – 2 x 1kW HF Broad Band Hybrid Combiner

Connectors: ‘N’

Construction: Cast aluminium case, solid encapsulation, epoxy paint finish

Environment: Outdoor unprotected

Frequency: 1.5 – 32MHz

Impedance: 50 ohm

Input Power: 2 x 1kW average (2kW peak)

Insertion Loss: <0.25 dB (matched loads)

Isolation: >30 dB (matched loads)

Load Ports: 2 x 50 ohm ‘N’ Connectors

Load VSWR: 2.5 : 1 max

Output Power: 2kW average (4kW peak)

Temperature: -40°C to +70°C

VSWR: <1.2 : 1 max

Weight: 12kg

HFH2-10 – 2 x 10kW HF Broad Band Hybrid Combiner

Connectors: 7/8″ or 1 5/8″ EIA

Construction: Aluminium case, silicon oil cooled, pressure relief valve, epoxy paint finish

Frequency: 2 – 30MHz

Impedance: 50 ohm

Insertion Loss: <0.25 dB (matched loads)

Isolation: >30 dB (matched loads)

Load Ports: 2 x 50 ohm 7/8″ EIA

Load VSWR: 2.5 : 1 max

Power: 2 input channels, each 10kW average (40kW peak), 20kW average output for co-phased inputs

Temperature: -40°C to +70°C

VSWR: <1.2 : 1 max

Weight: 55kg

HFH2-2 – 2 x 2 kW HF Broad Band Hybrid Combiner

Connectors: ‘N’, ‘HN’

Construction: Cast aluminum case, solid encapsulation, epoxy pain finish

Environment: Outdoor unprotected

Frequency: 1.5 – 31MHz

Impedance: 50 ohm

Input Power: 2 x 2kW average (4kW peak)

Insertion Loss: <0.25 dB (matched loads)

Isolation: >30 dB (matched loads)

Load Ports: 2 x 50 ohm ‘N’ Connectors

Load VSWR: 2.5 : 1 max

Output Power: 4kW average (8kW peak)

Temperature: -40°C to +70°C

VSWR: <1.2 : 1 max

Weight: 12kg

HFH4-1 – 4 x 1 kW HF Broad Band Hybrid Combiner

Balancing Loads: 6 x 500 Watt 50 ohm

Cooling: Solid encapsulation natural convection

Frequency: 2 – 40MHz

Impedance: 50 ohm

Input Sockets: ‘N’ Sockets

Input Power: 4 x 1kW average

Insertion Loss: 0.5 dB (matched loads)

Isolation: >30 dB (matched loads)

Load Sockets: ‘N’ Sockets

Load VSWR: 3 : 1 max

Output Sockets: ‘N’ Sockets

Phase: 0° +/- 5°

Splitter Loss: 6 dB

Temperature: -40°C to +55°C

VSWR: <1.2 : 1 max

HFH6-50/B – Broad Band VHF Hybrid Combiner

Configuration: Cast aluminium case, solid encapsulation, epoxy paint finish

Connectors: BNC

Frequency: 20 – 90MHz

Impedance: 50 ohm

Input Power: 6 x 50 Watt

Insertion Loss: <0.75 dB + 7.8 dB splitting loss

Isolation: >40 dB (matched loads)

Load Ports: 8 x 50 ohm (32 Watt each)

Load VSWR: 2.5 : 1 max

Output Power: 50 Watt

VSWR: Less than 1.2 : 1 (matched loads)

Weight: 1kg (exclusive of mounting plate and loads)

HFM2-1 – 2 x 1 kW HF Transmitter Multicouplers

Connectors: ‘N’, ‘HN’, 7/8″ EIA, 7/16″ Spinner

Cross Cover Frequency: Notch centre to be specified between 3-18MHz (lower notch centres available)

Environment: Indoor -40°C to +55°C (natural convection)

Frequency: 0.1 – 32MHz

Impedance: 50 ohm

Insertion Loss: <0.3 dB (matched load)

Isolation: >30 dB (matched load)

Load VSWR: 3 : 1 max

Notch Width: 15%, 20%, 40% of cross over frequency

Power: 2 input channels each 1kW average (2kW peak) 1 output channel 2kW average (4kW peak)

VSWR: <1.2 : 1 (matched loads)

Weight: 15kg

HFM2-10 – 2 x 10 kW HF Transmitter Multicouplers

Connectors: 1 5/8″, 3 1/8″ EIA

Cross Cover Frequency: Notch centre to be specified between 3-18MHz (lower notch centres available)

Environment: Outdoor unprotected -40°C to +55°C. Silicone oil cooled natural convection

Frequency: 0.1 – 32MHz

Impedance: 50 ohm

Insertion Loss: <0.3 dB (matched load)

Isolation: >30 dB (matched load)

Load VSWR: 3 : 1 max

Notch Width: 15%, 20%, 40% of cross over frequency

Power: 2 input channels each 20kW average (40kW peak), 1 output channel 40kW average (80kW peak)

VSWR: <1.2 : 1 (matched loads)

Weight: 250kg

HFM2-2 – 2 x 2 kW HF Transmitter Multicouplers

Connectors: ‘N’, ‘HN’, 7/8″ EIA, 7/16″ Spinner

Cross Cover Frequency: Notch centre to be specified between 3-18MHz (lower notch centres available)

Environment: Indoor -40°C to +55°C (natural convection)

Frequency: 0.1 – 32MHz

Impedance: 50 ohm

Insertion Loss: <0.3 dB (matched load)

Isolation: >30 dB (matched load)

Load VSWR: 3 : 1 max

Notch Width: 15%, 20%, 40% cross over frequency

Power: 2 input channels each 2kW average (4kW peak) 1 output channel 4kW average (8kW peak)

VSWR: <1.2 : 1 (matched loads)

Weight: 17kg

HFM2-20 – 2 x 20 kW HF Transmitter Multicouplers

Connectors: 3 1/8″ EIA

Cross Cover Frequency: Notch centre to be specified between 3-18MHz (lower notch centres available)

Environment: Outdoor unprotected -40°C to +55°C. Silicone oil cooled natural convection

Frequency: 0.1 – 32MHz

Impedance: 50 ohm

Insertion Loss: <0.3 dB (matched load)

Isolation: >30 dB (matched load)

Load VSWR: 3 : 1 max

Notch Width: 15%, 20%, 40% of cross over frequency

Power: 2 input channels each 20kW average (40kW peak) 1 output channel 40kW average (80kW peak)

VSWR: <1.2 : 1 (matched loads)

Weight: 325kg

HFM2-5 – 2 x 5 kW HF Transmitter Multicouplers

Connectors: 7/8″, 1 5/8″ EIA, LC

Cross Cover Frequency: Notch centre to be specified between 3-18MHz (lower notch centres available)

Environment: Outdoor unprotected -40°C to +55°C. Silicone oil cooled natural convection

Frequency: 0.1 – 32MHz

Impedance: 50 ohm

Insertion Loss: <0.3 dB (matched load)

Isolation: >30 dB (matched load)

Load VSWR: 3 : 1 max

Notch Width: 15%, 20%, 40% of crossover frequency

Power: 2 input channels each 20kW average (40kW peak) 1 output channel 40kW average (80kW peak)

VSWR: <1.2 : 1 (matched loads)

Weight: 150kg

MHFH2 – RX – A

Balancing Loads: Internal

Configuration: Cast aluminium box, 0.05m x 0.05m x 0.03m solid encapsulation

Connectors: ‘N’, BNC

Frequency: 50kHz – 50MHz

Insertion Loss: <0.5 dB

Isolation: >35 dB

Power: 2 x 2 Watt

Temperature Range: -40°C to +55°C

VSWR: <1.2 : 1

MHFH2 – RX – B

Balancing Loads: Internal

Configuration: Cast aluminium box, 0.05m x 0.05m x 0.03m solid encapsulation

Connectors: ‘N’ BNC

Frequency: 10kHz – 32MHz

Insertion Loss: <0.5dB

Isolation: >35 dB

Power: 2 x 2 Watt

Temperature Range: -40°C to +55°C

VSWR: <1.2 : 1

MHFH4 – RX – A

Balancing Loads: Internal

Configuration: Cast aluminium box, 0.12m x 0.06m x 0.03m solid encapsulation

Connectors: ‘N’ BNC

Frequency: 50kHz – 50MHz

Insertion Loss: <0.5 dB

Isolation: >30 dB

Power: 4 x 1 Watt

Temperature Range: -40°C to +55°C

VSWR: <1.2 : 1

MHFH4 – RX – B

Balancing Loads: Internal

Configuration: Cast aluminium box, 0.12m x 0.06m x 0.03m solid encapsulation

Connectors: ‘N’ BNC

Frequency: 10kHz – 32MHz

Insertion Loss: <0.5 dB

Isolation: >30 dB

Power: 4 x 1 Watt

Temperature Range: -40°C to +55°C

VSWR: <1.2 : 1

RL100-5 – 50 ohm 10kW Resistive Load

Frequency: 1.5 – 32MHz

Input Impedance: 50 ohm

Power: 10kW avg. continuous, 20kW peak

VSWR: <1.15 : 1

Connectors: 7/8″ or 1 5/8″ EIA

Weight: 60kg

Construction: Aluminium housing with Alocrom 1200 and enamel paint finish

Humidity: 100% at 30^°C

Temperature: -40^°C to +65^°C

Balanced Connection: M6 Insulators

Balanced Impedance: 600 ohm

Frequency Range: See table below

Insertion Loss: <0.2 dB

Power Rating: +10dBm

Temperature Range: -20°C to +55°C

Unbalanced Connection: See table below

Unbalanced Impedance: 50 ohm

VSWR: See table below

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