[Elecraft] KX2 Antenna Analyzer Program

[Fred Jensen]

Oh for Pete's sake!

"Left to their own, most hams will complicate a simple subject beyond 
recognition."
     Art, W6RMK [SK]

who taught me the code at age 12 and said the above while explaining how 
my link coupling to the "tank" matched the 6L6 plate circuit impedance 
[several thousand ohms], to the low impedance at the end of the 75-ohm 
twin-lead from my 40m dipole.

And, to forestall a posting storm from those racing to the keyboard to 
point out the "75 ohm twin-lead typo," there were at least two grades of 
commercial 75 ohm twin-lead, a fairly small, flexible version for lower 
power, and a much heavier, somewhat unwieldy version for high power.  
Been years since I've seen them.  For the less financially endowed [e.g. 
me], there was also lamp cord ... close enough.

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 2/19/2018 11:45 PM, David Gilbert wrote:
>
> No, I don't know that at all.  I understand the reluctance to use that 
> terminology, but strictly speaking you're wrong.  Reactance networks 
> are reciprocal ... they don't care in the least which direction power 
> is heading.  The combination of the feedline, the "antenna tuner", and 
> the output impedance  of the transmitter reflect back along the 
> feedline to the antenna the same reactance that you would use at the 
> antenna feed point to zero out the total reactance there ... i.e., 
> "tune" it.  The only difference lies with their respective losses., 
> and if you had lossless feedline and lossless components there would 
> be no difference at all.
>
> It's basic network physics, and reciprocity is reciprocity.
>
> 73,
> Dave   AB7E