[Elecraft] LSB on 75 Meters

[KU4AF]

Really? You're going to hang your hat on 5.000 - 9.003 = 3.997 ?
Just get a calculator and push the buttons. It's -4.003. Every time! Nothing
in the historical record changes this.

John, KU4AF
Pittsboro, NC


Joe Subich, W4TV-4 wrote
> 
>> Working the sideband part into it with a 9 MHz USB signal and a 5 MHz
>> LO - Suppressed carrier freq: 9.000 minus 5.000 = 4.000 3 kHz
>> modulation tone: 9.003 minus 5.000 = 4.003
> 
> No, it's 5.000 - 9.000 = -4.000 and 5.000 - 9.003 = 3.997
> and it's 5.500 - 9.000 = -3.500 and 5.500 - 9.003 = 3.497
> 
> The VFO does not need to be the LO ... the IF can just as easily be
> connected to the LO port.
> 
>> Just as a sanity check, take another look at your own negative
>> number example, Joe, and 'splain to me how 5.000 minus 9.003 gives
>> minus 3.987. OK,I'll grant you a typo and assume you meant minus
>> 3.997, but you're still wrong. It's minus 4.003.
> 
> You're correct it's a typo *BUT* there is no error in the inversion
> when the 9 MHz USB signal is applied to the LO port of the mixer.
> All you need to do is spend some time with the historical record.
> 
> 73,
> 
>     ... Joe, W4TV
> 
> 

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