[Elecraft] Amp or tuner / Chicken or Egg

[Gerald Manthey]

Why is 10' to 15' of coax  what you would want if using a tuner in the shack? I know about loses in really long runs, but why 10 to 15 feet? 
Thanks asking to learn not criticizing. 
Gerald 

> On Feb 17, 2016, at 3:31 PM, Jim Rodenkirch <rodenkirch_llc at msn.com> wrote:
> 
> Gary - depends on your antenna and how you feed it.
> 
> If you intend to feed a multi-band antenna with open wire line, you'll need
> some sort of tuner at the point where you transition from open wire to coax:
> 
>   - if you plan on doing that out near the base of your antenna (the most
> efficient spot) then save your 
>     money and purchase an auto tuner, e.g., an LDG Z11 ProII, and place it
> at the point where the open 
>     wire line transitions to coaxial feed. 
>   - if you plan on doing that inside the shack and can keep the coaxial run
> short, the internal auto tuner
>     would work, albeit you could employ an LDG Z11 ProII there as well.
> 
> If you plan on feeding any multi band antenna with coax of a length longer
> than 10' to 15' an auto tuner inside the shack isn't worth much -- place an
> LDG Z11 ProII style auto tuner at the base of the antenna, 'tween the
> coaxial fee line and the antenna feed point and call it a day. 
> 
> If you plan on taking the K3S on portable trips....its auto tuner wud be 'da
> way to go, as long as you keep coaxial runs 'tween the K3S and the antenna
> feed point short...."short" means < 10' to 15' or so.
> 
> 72 de Jim R. K9JWV
> 
> 
> 
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