[Elecraft] P3 Photo

[David Woolley (E.L)]

Guy Olinger K2AV wrote:

> stuff available) switching supply that..
> 
> 2) is completely noiseless at RF frequencies.

Not physically possible for a switching supply; you need to specify 
acceptable, non-zero levels of RF noise.

> 3) has a sense lead to the 13V bus *inside* the K3 and maintains a perfect
> voltage to the K3, regardless of some additional loads (like my 10W K3)

Why?  Surely the K3 is designed to be tolerant of battery voltage 
variations.

> 4) has a separate connection(s) to a battery(s), which it uses as INPUT to
> the switching supply and draws from automatically and seamlessly if the AC
> drops.

This and the following seem to be more like the requirements for a 
commercial use UPS (as against domestic use ones).

> 8) completely RF proof and can't be queered by RF in the shack.

Again, not physically possible, for any piece of electronics; you need 
to specify acceptable levels.


-- 
David Woolley
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