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HF4 Series 400 Watt HF Wide Band Antenna Matching

HF4 Series 400 Watt HF Wide Band Antenna Matching

The HF4 Transformer Series has been specially designed to enhance fixed station HF receiving arrays.
Fixed station HF receiving arrays often face high voltages, which are uncommon in typical receiving systems. These voltages can arise from static build-up or lightning-induced electromagnetic fields (EMFs) from nearby strikes.
Our HF4 Series matching transformers, designed for 400 Watt average power, offer an ideal solution for receiving arrays. They effectively mitigate the risk of high voltage damage and provide a crucial DC path to the ground, offering added protection to the receiving system.
Key Features:
  • Wide band coverage from 1.5 to 32 MHz, ensuring compatibility with a diverse range of frequencies.
  • Perfectly suited for fixed station receiving arrays, elevating system performance.
  • Equipped with an internal static drain ground, reducing the risk of damage caused by high voltages.
  • A wide selection of balanced and unbalanced impedance ratios available, catering to most antenna configurations, with the option for non-standard ratios upon request.
  • Built to withstand the most demanding environments, these transformers feature cast aluminium cases that are fully hermetically sealed, ensuring suitability for military and commercial applications. For EMP-proof operation, no capacitors are incorporated, ensuring reliable performance in critical scenarios.
Enhance your receiving arrays with the HF4 Transformer Series giving you advanced protection and reliable performance across a wide range of frequencies.
Wide band 1.5 – 32 MHz
Hermetically sealed
Internal static drain ground
Fixed station
Specification
Frequency
Impedance
Power
Insertion loss
VSWR
Balance ratio
Load VSWR
Coaxial connectors
Balance terminals
Temperature range
Weight
High voltage protection
Configuration
Shipping dimensions
Data
1.5 – 32 MHz
See table below
400 Watt average, 1600 Watt peak
Less than 0.3 dB
Less than 1.2:1 (2 – 30 MHz), Less than 1.3:1 (1.5 – 32 MHz)
Greater than 26 dB
2.5:1 max.
‘N’ type (Others on request)
Alumina ceramic M6 thread
-40ºC to +55ºC
1.2kg gross
Arcing horns and internal static drain (NB No internal capacitors fitted.)
Cast aluminium case (LM25). Hermetically sealed. Epoxy paint finish.
220 x 150 x 120 mm approx.

Balance Impedance (ohm)

Unbalanced impedance (ohm)
50
75
200
300
370
450
600
50
HF4-55
HF4-57
HF4-520
HF4-530
HF4-537
HF4-545
HF4-560
75
HF4-75
HF4-77
HF4-720
HF4-730
HF4-737
HF4-745
HF4-760

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