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Marcus Müller
Marcus Müller
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Why do we use LSB below 10Mhz10 MHz and USB above 10Mhz10 MHz when operating SSB HF?

As a relatively new ham operator, I understand that it is customary to use lower-sideband below 10Mhz10 MHz and upper-side band above 10Mhz when operating single-sideband HF. I'm curious how we got to such a standard instead of just picking one or the other for all bands.

To further complicate it for new hams, it seems that RTTY operators use lower-sideband everywhere and PSK operators use upper-sideband everywhere. (Reference)

Is there any technical reason not to use upper-sideband everywhere? Or is this purely tradition to be passed on for the sake of tradition? Does anyone know some verifiable history for how this de-facto standard came to be?

Why do we use LSB below 10Mhz and USB above 10Mhz when operating SSB HF?

As a relatively new ham operator, I understand that it is customary to use lower-sideband below 10Mhz and upper-side band above 10Mhz when operating single-sideband HF. I'm curious how we got to such a standard instead of just picking one or the other for all bands.

To further complicate it for new hams, it seems that RTTY operators use lower-sideband everywhere and PSK operators use upper-sideband everywhere. (Reference)

Is there any technical reason not to use upper-sideband everywhere? Or is this purely tradition to be passed on for the sake of tradition? Does anyone know some verifiable history for how this de-facto standard came to be?

Why do we use LSB below 10 MHz and USB above 10 MHz when operating SSB HF?

As a relatively new ham operator, I understand that it is customary to use lower-sideband below 10 MHz and upper-side band above 10Mhz when operating single-sideband HF. I'm curious how we got to such a standard instead of just picking one or the other for all bands.

To further complicate it for new hams, it seems that RTTY operators use lower-sideband everywhere and PSK operators use upper-sideband everywhere. (Reference)

Is there any technical reason not to use upper-sideband everywhere? Or is this purely tradition to be passed on for the sake of tradition? Does anyone know some verifiable history for how this de-facto standard came to be?

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BenSwayne
BenSwayne
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Why do we use LSB below 10Mhz and USB above 10Mhz when operating SSB HF?

As a relatively new ham operator, I understand that it is customary to use lower-sideband below 10Mhz and upper-side band above 10Mhz when operating single-sideband HF. I'm curious how we got to such a standard instead of just picking one or the other for all bands.

To further complicate it for new hams, it seems that RTTY operators use lower-sideband everywhere and PSK operators use upper-sideband everywhere. (Reference)

Is there any technical reason not to use upper-sideband everywhere? Or is this purely tradition to be passed on for the sake of tradition? Does anyone know some verifiable history for how this de-facto standard came to be?