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The original Jackson and later the HR2510 / Lincoln line of radios modulate the TX mixer (an unbalanced balanced modulator) when transmitting AM, rather than the SSB balanced modulator.

Most recent ham radios like my FT857D put the modulation for AM at the balanced modulator used for SSB, which can introduce aliasing on negative peaks (watch the scope pattern to see what I mean), which is another form of distortion.

The FT101 series put the AM modulation on the AM buffer circuit after the AM carrier crystal, rather than the balanced modulator like in later models.

[QUOTE="NZ8N, post: 737350, member: 51368"] The original Jackson and later the HR2510 / Lincoln line of radios modulate the TX mixer (an unbalanced balanced modulator) when transmitting AM, rather than the SSB balanced modulator. Most recent ham radios like my FT857D put the modulation for AM at the balanced modulator used for SSB, which can introduce aliasing on negative peaks (watch the scope pattern to see what I mean), which is another form of distortion. The FT101 series put the AM modulation on the AM buffer circuit after the AM carrier crystal, rather than the balanced modulator like in later models. [/QUOTE]

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