[Elecraft] Re: K1 on USB CW

[Leigh L. Klotz, Jr.]

As I read it, the USB signal was generated at 455Kc and then mixed up to 
9Mc, thus giving a USB 9Mc signal.  The VFO was then in thr 4.0-5.3Mc 
range.   And that was added or subtracted...

On Thu, 17 Jun 2004 8:02pm, Vic Rosenthal wrote:
> 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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73,
WA5ZNU Leigh