WHY THINGS ARE THE WAY THEY ARE....Ever wonder why 40 meters is LSB and above 40 meters is USB?
We can blame Central Electronics ... In September 1952 they came out with the CE-10A a multiphase exciter with 9 Mhz phasing circuitry The 9 Mhz SSB signal was then heterodyned by mixing with a 5 Mhz crystal or suitable external VFO to the desirable frequency , 9 Mhz minus 5 Mhz gave us 80 meter LSB, 9 Mhz plus 5Mhz produce 20 meter USB. A commonly used 5 Mhz VFO was the military BC-458 transmitter with a reduced power output obtained by reducing plate voltage to 75 VDC. In that, the standard was established by Central Electronics, subsequent manufacturers followed suit with their designs. ...
For a complete history of the Central Electronics product line CHECK ...http://www.ce-multiphase.com/history.html
We can blame Central Electronics ... In September 1952 they came out with the CE-10A a multiphase exciter with 9 Mhz phasing circuitry The 9 Mhz SSB signal was then heterodyned by mixing with a 5 Mhz crystal or suitable external VFO to the desirable frequency , 9 Mhz minus 5 Mhz gave us 80 meter LSB, 9 Mhz plus 5Mhz produce 20 meter USB. A commonly used 5 Mhz VFO was the military BC-458 transmitter with a reduced power output obtained by reducing plate voltage to 75 VDC. In that, the standard was established by Central Electronics, subsequent manufacturers followed suit with their designs. ...
For a complete history of the Central Electronics product line CHECK ...http://www.ce-multiphase.com/history.html
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