For more info on the dual xfmr coupler read go to
www.telepostinc.com/lp100.html and click on the QEX article link near
the top of the page. In the article I address many of the issues related
to the coupler design, with footnotes to relevant design references.
The original design dates to US Patent # 3426298 by C. G. Sontheimer and
R. E. Fredrick in 1969.
73,
Larry N8LP
Paul T. Rubin wrote:
Thanks to all who responded to my question about termination.
Now another: What is the limiting factor in the power rating of the coupler?
With either the 20db (max 25W), or the 30db (max 250W) the power delivered
to the secondary is 0.25W. The terminating resistors are rated at 3W. Are
there high circulating currents in the core that limit the power level, or
is there some other mechanism that I am overlooking? Is the power rating of
a torroid something that can be calculated in the design, or must it be
derived empirically?
As always, thanks fer learnen me something,
Paul N8NOV
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