[Elecraft] K3 (not S) Antenna tuner strangeness

[Bill Conkling]

Try a “slightly different tap position” and see what happens.  Your words, not mine.

…bill  nr4c



> On Jul 22, 2016, at 12:19 PM, brian <alsopb at comcast.net> wrote:
> 
> Guys,
> 
> I've run into something on 80M trying to use the internal antenna tuner.
> It fails to tune to a low SWR.
> 
> My recollection is that the tuner worked fine on the same antenna before. "Worked before" may have been with a slightly different tap position.
> 
> Antenna is an MFJ 1/8 Wave vertical with loading coil and 4:1 "Guanella" balun at the antenna base.
> 
> With the current coil tap an RF analyst antenna analyzer shows the following:
> 
> 3.55 MHz SWR=2.0  Z=35 ohms
> 3.6      SWR=2.7  Z=36 ohms
> 
> The K3 in the tune position (tuner out) shows SWR's of 1.7 and 2.4 respectively.
> 
> The antenna tuner finds a match for a 50 ohm dummy load OK.  Using those settings as a starting point, we attempted to match the antenna.
> 
> The best it can do is bring the 1.7 SWR down to 1.4.  The 2.0 SWR can brought down to 1.7 at best.
> 
> Other bands work OK.
> 
> Any thoughts?
> 
> 73 de Brian/K3KO
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