9Mc, thus giving a USB 9Mc signal. The VFO was then in thr 4.0-5.3Mc
range. And that was added or subtracted...
> Leigh L. Klotz, Jr. wrote:
>> I just picked up a copy of the June CQ in the airport bookshop and
>> p.28 has a sidebar by K2MGA (CQ Publisher) on the history of SSB:
>> Regardless of how the SSB signal was
>> generated, the 455 kc USB signal was mixed up
>> to 9 Mc. Using a converted war-surplus
>> BC-458 transmitter...as a VFO, the
>> 4.0 to 5.3 Mc output was either added
>> to or subtracted from the 9Mc SSB
>> signal. That produced a USB signal on
>> 20 meters or an LSB signal on 75 meters.
>
> This is just wrong. Say you generate a USB signal at 9 MHz from a 1
> KHz
> audio tone. The (suppressed) carrier of the generated USB signal is at
> 9.000 MHz and the upper sideband is at 9.001 Mhz. Then mixing with a
> 5.0 MHz VFO would give sum frequencies of 14.000 and 14.001 MHz as well
> as differences of 4.000 and 4.001 MHz. This is USB in both cases.
>
> Of course, the VFO would tune in opposite directions.
>
> Even a CW operator like me can add and subtract!
>
> --
> 73,
> Vic, K2VCO
> Fresno CA
>
http://www.qsl.net/k2vco>
>
>
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