Can the 8892D300 load be used from DC-470 MHz?

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Absolutely.  The 8892D300 load is a Digital Broadcast, oil cooled load, designed for use from 470-860MHz at 1.065:1 VSWR Max.  However, It can be used for frequencies from DC to 470MHz, but the VSWR specs will be close to and possibility exceeding the VSWR specs of an 8892-300 load at 1.1:1 Max.