[Lowfer] Ultimate LOWFER Transmitter? (LONG)

[John Davis]

>John has answered the loss questions quite well, but I'd like to
>clarify the effect of external lossy structures.


Thanks, Stewart.  Relating the loss to the reduction of currents in the
separate grounds plus environmental factors, while the total current in the
radiating elements is 3 db greater by the antennas being "in parallel," is
what I was struggling to express but couldn't quite manage in such a clear
and unambiguous way.

And to address one of Steve's earlier questions about my perception of
impedance interactions between the two antennas:  I probably shouldn't have
muddied the waters with that point.  Even for such short radiators, there is
still some mutual coupling at a hundred feet or so.  But it's not enough of
an impedance change to count as a "transformation," by any means, let alone
account for the 3 db improvement.  I believe I'll put myself up for the 'Mr
Answer Guy Don't-Think-I-Shoulda-Said-That' award  this year for clouding
the issue.

So, Steve, it's not power from nowhere.  It's an issue of loss management.
Just as you can parallel amplifiers to achieve a noise figure that's lower
than the noise figure of any one of them, you can parallel inefficient
radiators to achieve less inefficiency than any one of them posseses alone.
All other factors being equal, the inefficiency will be reduced by 3 db for
each doubling of similar radiators.

73,
John