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


______________________________________________________________
NLRS mailing list
Home: https://mailman.qth.net/mailman/listinfo/nlrs
Help: https://mailman.qth.net/mmfaq.htm
Post: mailto:NLRS@mailman.qth.net

This list hosted by: https://www.qsl.net
Please help support this email list: https://www.qsl.net/donate.html