[Elecraft] K3 Tuner

[G4ILO]

Brett Howard wrote:
> 
> So I was recently reading about the IC756ProIII and noticed that it said
> its
> tuner was rated for 3:1?  Does that really mean that you have to have a
> 3:1
> or better SWR or it can't tune it?
> 
Yes it's true, and it's the same for Icom and Kenwood radios too. I believe
that the Ten-Tec tuners are LDG's, and have more comparable capability to
the Elecraft tuners.

It's not necessarily a benefit to be able to tune greater mismatches,
because as illustrated here http://www.g4ilo.com/mismatch_losses.html you
can lose a lot of your power warming up the co-ax with a high SWR. Also you
can't assume the losses in the tuner itself are as low with a big mismatch
as they are with a good match. My K2 and K3 will both find an acceptable
match for my small attic loop on 80m and 160m, but I have never worked
anyone on either of those bands and have never heard anything on 160m. But
if like me you have a very short feeder then the advantages of being able to
tune an load of worse than 3:1 SWR exceed the disadvantages.

-----
Julian, G4ILO  K3 s/n: 222 K2 s/n: 392
G4ILO's Shack: www.g4ilo.com
Zerobeat Ham Forums: www.zerobeat.net/smf
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