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• What do they need to pay attention to with their rigs?

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A lot of HF+6 radios will retain the voice processor settings even when switched to FM mode, so make sure they turn off the mic processor, and after doing so, set the mic gain to a reasonable level.

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Mics, headsets, etc. tailored for “DX” or contesting SSB audio typically have a frequency response that sounds thin (a lot of low-end rolloff) or nasally (midrange peaking) on FM.

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Some HF radios don’t have “true FM” modulators but rather phase modulators.? Some don’t sound very good regardless of what mic is used, whether that’s due to the modulator or the AF circuits preceding it.

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