[Elecraft] AX1 works great

[Jim Brown]

On 10/1/2024 2:24 PM, David Woolley wrote:
> Re: output impedance:  Not the output impedance, but the optimum safe 
> load impedance.  The actual output impedance is generally a lot lower. 
> The value being matched to 50 ohms is approximately, but less than, the 
> supply rail voltage divided by the maximum safe current, for the output 
> device, but more generally will such as to maximise the available output 
> power subject to keeping the output stage within the safe operating 
> area, and avoid clipping, whilst, in conjunction with any safety 
> measures, tolerating a significant divergence from the nominal 50 ohms.

Exactly right.

> Re: position of capacitor:  A capacitor in the shack can act like an 
> inductor, at the antenna.

This is totally dependent on the match of the antenna to the 
transmission line, the impedance of the line, and its length. The person 
asking the question needs to open the ARRL Handbook and/or Antenna Book 
and study transmission lines.
> 
> Also all of these things are only strictly true for a completely pure 
> sine wave.

I think you may be confusing modulation, which is often complex, with 
RF, which IS essentially sinusoidal, minus distortion components, which 
are quite small by the time they get through the output network to the 
transmission line.

73, Jim K9YC