[Elecraft] SS30DV feedback

[Joe Subich, W4TV]

> Doing so reduces any IR drop on power supply wiring by a factor of 2
> or 3.

Higher voltage - 24 or 40 V results in decreasing the voltage drop by a
factor or 4 or 9.  The voltage drop is a function of current *squared*.

24 or 48 volt finals certainly produce much cleaner signals as the
active devices are not likely to be driven into current saturation
*or* cutoff in order to reach useful power output where the 12V devices
are pushed to the wall to make 100W output.

73,

   ... Joe, W4TV


On 10/2/2015 4:12 PM, brian wrote:
> Fred,
> I'm a fan of higher voltage -- perhaps 24 or 40 volts so that PA
> transistors can produce cleaner signals.   Doing so reduces any IR drop
> on power supply wiring by a factor of 2 or 3.  KISS.
>
>   IC's are going to lower and lower voltages.   Multiple circuits within
> boxes require a menagerie of voltages.   One is faced with having to
> generate more heat in regulators dropping 40 volts to 12, maybe 5, 3.3
> and 1.6 V.   Perhaps the era of efficient multivoltage power supplies
> with multiple wires for multiple voltages will return.   (Remember
> filament ,plate, screen and grid voltage power supplies in days of
> yore?  Guys generally didn't mistakenly hook up the 3500 V B+ wire to
> the filaments......)
>
> 73 de Brian/K3KO
>
>