[Elecraft] 43' Vertical and the K2 tuner

[dave]

But note that for the 43' mast they use an autotuner located at the 
base of the mast, no coax losses involved.  For the 33' mast they use 
~50' of various pieces of coax with the associated losses.  This a 
very biased comparison.

If you are going to use a non-trapped, and hence non-resonant, 
vertical it is best to put the tuner at the base of the mast. 
Otherwise the coax losses will eat up a fair amount of the available 
power, even for a 43' mast (although they don't tell you this).


73 de dave
ab9ca/4



Paul Christensen wrote:
>> The 43' vertical is recent fad and it makes no sense at all. Virtually
>> any trapped multiband vertical should easily outperform it.
> 
> Steve,
> 
> I thought the same until I read this:
> 
> http://vk1od.net/antenna/multibandunloadedvertical/
> 
> According to the author, the so-called "magic" of the 43-foot length is that 
> radiation resistance remains quite high across the HF spectrum and thus, 
> system losses are minimized.  Compared to a 33-foot vertical, system losses 
> are much lower across the spectrum.
> 
> But to your point, a trapped multi-band vertical can offer similar 
> performance.  Personally, I think the negativity associated with trap loss 
> in multi-band antennas is grossly overblown.  Other systematic losses mask 
> what little loss exists in most trapped antenna designs.
> 
> Anyway, not sure how valid all this data really is, but the data presented 
> is interesting
> 
> Paul, W9AC 
> 
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