Seems I responded to the OP only.
Oops.
N4GA has an article on his site for a 50dB sampler:
http://www.n4ga.com/50db-hf-rf-sampler/
This article goes takes a somewhat unusual path to get to the cheese, but
works as well:
https://www.collinsradio.org/wp-content/uploads/2015/05/Build-a-Quality-RF-Power-Sampler-Jackson.pdf
And if you want it, I have a scratch (not pretty) spreadsheet that will
calculate the termination resistors based
on coupling in dBm and number of transformer turns. Be warned that it does
no reasonability checks, though.
The core size and material as well as the dissipation of the termination
resistors you have to handle on your own.
73,
Jim N7CXI
On Tue, Jun 15, 2021 at 8:35 AM Ron W4BIN <ka4inm@gmail.com> wrote:
> On 6/14/21 8:11 PM, Richard Solomon wrote:
>
> > Looking for an HF (3-30 MHz) Coupler
> > for rf measurements. HB or commercial
> > will do. Accuracy is not important but
> > flatness would be a concern.
>
> > 30dB port would do.
>
> > Any suggestions ?
>
>
> I found an article about them:
>
> see:
> http://k6jca.blogspot.com/2015/01/building-hf-directional-coupler.html
>
> google.com is your friend!
> --
> Ron W4BIN - Understanding is much better than
> knowing how.U
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>
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