Valcom has been designing and producing antenna matching transformers for many years. New custom matching transformer designs are completed by Valcom's Engineering Department every year.

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The VMT-7117 , one of Valcom's standard, off-the-shelf series matching transformers, provides the correct impedance match between a 50 Ohm transmitter and a 600 ohm Rhombic antenna terminated with Valcom's VTR-600 . The VMT-7117 is a matching transformer for high power (up to 5KW average power) transmitter-to-antenna matching.

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The frequency or frequency band of operation of the VMT-7117 must be specified so the transformer design can be optimized for minimum VSWR for the specified operating frequency or frequency band.

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Other antenna heights and configurations can also be matched, but the antenna must be specified so the optimum transformer design can be used. If a narrower frequency range is specified, the matching transformer design is chosen to match the antenna and the receiving frequency range.