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ROBB -

Yes there are two sidebands on AM. However, the lower sideband is a "mirror image" of the upper sideband, and they each contain exactly the same audio information. So there will actually be no difference in audio content between AM and SSB, and the available bandwidth for audio will be the same for both modes...approx 3.5khz. Since human voice frequency range is from 300 to 3000 hz, this is all that is really required from a stock mike. Using a replacement mike, like the ones you pictured, sounds better for two reasons:

1. The microphone's response curve is linear, so the voice reproduction is much more accurate than with a stock mike.

2. The wide frequency response allows the mike to pick up the harmonics of the speaker's voice. Even though they are attenuated by the 3.5khz bandwidth of the transceiver, there is still enough there to make the audio signal richer and more natural-sounding.

- 399

<blockquote data-quote="unit_399" data-source="post: 237628" data-attributes="member: 7311">ROBB -&nbsp;Yes there are two sidebands on AM. However, the lower sideband is a &quot;mirror image&quot; of the upper sideband, and they each contain exactly the same audio information. So there will actually be no difference in audio content between AM and SSB, and the available bandwidth for audio will be the same for both modes...approx 3.5khz. Since human voice frequency range is from 300 to 3000 hz, this is all that is really required from a stock mike. Using a replacement mike, like the ones you pictured, sounds better for two reasons:&nbsp;1. The microphone&#039;s response curve is linear, so the voice reproduction is much more accurate than with a stock mike.&nbsp;2. The wide frequency response allows the mike to pick up the harmonics of the speaker&#039;s voice. Even though they are attenuated by the 3.5khz bandwidth of the transceiver, there is still enough there to make the audio signal richer and more natural-sounding.&nbsp;&nbsp;- 399</blockquote>

[QUOTE="unit_399, post: 237628, member: 7311"] ROBB - Yes there are two sidebands on AM. However, the lower sideband is a "mirror image" of the upper sideband, and they each contain exactly the same audio information. So there will actually be no difference in audio content between AM and SSB, and the available bandwidth for audio will be the same for both modes...approx 3.5khz. Since human voice frequency range is from 300 to 3000 hz, this is all that is really required from a stock mike. Using a replacement mike, like the ones you pictured, sounds better for two reasons: 1. The microphone's response curve is linear, so the voice reproduction is much more accurate than with a stock mike. 2. The wide frequency response allows the mike to pick up the harmonics of the speaker's voice. Even though they are attenuated by the 3.5khz bandwidth of the transceiver, there is still enough there to make the audio signal richer and more natural-sounding. - 399 [/QUOTE]

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