Re: Binocular choke extras

On 3/20/25 21:15, Don wrote:

Don wrote:

Jeroen Belleman wrote:

Don wrote:

 <snip>
 

It's difficult for me to follow this conversation. Maybe my followup
simply repeats what you guys already said.
      The tubes are shields designed to fit inside the binocular core
holes. You then soldier them together with a PCB at each end like so:
>
      <https://www.qsl.net/g3oou/BBTrans_4278a.jpg>
>
It becomes more interesting with coax:
>
      <https://www.qsl.net/kf8od/ldmos53.jpg>

>
Not at both ends! That is not going to work!

>
What you say makes sense in retrospect.

 In retro-retrospect what you say doesn't make sense. Is
<https://www.qsl.net/kf8od/ldmos53.jpg> wrong? It says to solder both
ends.

That one is OK. The tubes connect on one end, but not on the other.
There's a gap between the sides in the bottom picture. It will work,
though if I were to make it, I wouldn't bother using coax for the
high-impedance winding.

 What flummoxes me is why shielded coax is is itself inserted into a
separately shielded sleeve?

Agreed. The coax shields are simply in parallel with the single-turn
low-impedance winding formed by the tubes. Maybe it shifts the upper
cut-off frequency a tiny bit upwards, but I'm not convinced it's worth
the trouble.
Jeroen Belleman