Which device converts a low-powered 28 MHz SSB exciter to a 222 MHz output signal?

A transverter is a device that takes a low-frequency signal and converts it to a higher frequency, making it ideal for amateur radio operations. In this scenario, the low-powered 28 MHz SSB exciter operates on the 10-meter band, and the transverter can convert that signal to a higher frequency, such as the 222 MHz output in question.

Transverters are commonly used in amateur radio to allow operators to utilize transceivers that may only cover HF (high frequency) bands while achieving communication on VHF (very high frequency) or UHF (ultrahigh frequency) bands. They typically do this through a combination of mixing circuits, amplifiers, and filters to ensure the output signal meets the necessary criteria for the desired frequency band.

While high-pass and low-pass filters serve specific functions related to frequency selection and signal integrity, they do not perform the conversion from one frequency to another. A phase converter, on the other hand, is more aligned with converting one phase of power to another and does not facilitate the frequency conversion required in this instance. Thus, the transverter is the only device listed that accurately describes the functionality needed to convert a signal from 28 MHz to 222 MHz.