Years ago I saw a circuit that used an OSRAM Golden Dragon LED as a detector. You had to use an X-Acto knife to cut into the soft clear plastic encapsulation over the diode and cut one tiny wire. The LED could then be used as a detector. I cannot for the life of me find the article that described this use. But it was pretty optimistic about results.

Zack W9SZ

On Tue, Apr 15, 2025 at 12:10 AM Glen Overby <gpoverby@gmail.com> wrote:
They're using a receiver design by VE2UG, which is based on the one by KA7OEI and K0XL.  Transmit is a PWM generator they bought on Amazon.

I'm collecting parts for a system.

73,
Glen

On Mon, Apr 14, 2025 at 11:14 AM Jon Platt via NLRS <nlrs@mailman.qth.net> wrote:

Some of us through the years have played with optical contacts.  Here is a link to W1VLFs YouTube video discussing and showing his 940 Nm 14 mile QSO.  The QSB and seeing the half power reduction testing is interesting.
73, Jon
W0ZQ


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