You got an RF converter? that does not change refresh rates, it changes the Radio Frequency.
This is a very common problem with things like DVD players and most older TV's. It is a good way to get you to buy more hardware, and act as a copyright enforcer at the same time.
From a site that has more info:
RF Frequency Converters Information on GlobalSpec Quote:
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RF frequency converters are integrated component assemblies required for converting microwave signals into lower (or intermediate) or higher frequency ranges for further processing. They generally consist of an input filter, a local oscillator filter, an IF filter, a mixer, and frequently an LO frequency multiplier, plus one or more stages of IF amplification. RF frequency converters may also incorporate a local oscillator, GC/gain compensation components, and an RF preamplifier
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