[Elecraft] Antenna tuners

[W2xj]

That only applies to class A stations with protected skywave. Otherwise, something near 225 degrees is best. 

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> On Jul 18, 2020, at 11:33, Fred Jensen <k6dgw at foothill.net> wrote:
> 
> And the Texas Bug Catcher, Webster BandSpanner, SteppIR's, et al.  All represent changes to the antenna itself, which would also include changing the height [e.g. cranking the tower up and down] and possibly cutting down nearby trees or metal buildings [:=).  Any change to the antenna itself or its near-field environment will affect the feed point complex impedance.  This would include adding traps, inductors, and capacitors to the antenna.
> 
> When you're done flutzing with the antenna itself, you are stuck with whatever complex impedance you find at the feed point.  AM broadcast verticals are generally engineered for coverage near the edges of the market area, meeting non-interference FS requirements, and minimizing self-cancellation between the ground and sky wave.  Something in the vicinity of 195 degrees is generally optimal.  They are not usually resonant and there will be fixed matching network(s) at the base(s) ... AM broadcast stations aren't known to QSY much.
> 
> I'm not familiar with the TurboTuner however many mechanical antenna adjusters operated by driving the phase angle between voltage and current to zero, that is effectively bringing the antenna into resonance so the feedline sees a resistive load. It's up to you to design the antenna so that resistive load matches the characteristic impedance of the feedline OR put a matching network between the feedline and the antenna feedpoint OR tolerate the SWR on the line and put the matching network in the shack.  Pick one.
> 
> 73,
> Fred ["Skip"] K6DGW
> Sparks NV DM09dn
> Washoe County
> 
>> On 7/17/2020 9:44 PM, Rick NK7I wrote:
>> Save one; the screwdriver antenna on my truck is tuned (coil adjusted) by the TurboTuner attached to my radio until a match is found.
>> 
>> And an argument could be made that a SteppIR controller performs a similar function.
>> 
>> The rest are matching circuits to compensate for the disparity of input to output.  😜
>> 
>> 73,
>> Rick NK7I
>> 
>> Email spiel Czech corruptions happen
>> 
>>>> On Jul 17, 2020, at 7:00 PM, Fred Jensen <k6dgw at foothill.net> wrote:
>>> 
>>> No antenna has, at any time, anywhere in any of our lifetimes, been "tuned" by an "antenna tuner."  So called antenna tuners are 2-port impedance matching networks ... all of them ... and their