kwest_techAfter some tinkering and realizing I needed to learn more about transistors, I figured out how to drive these coaxial switches that are available for cheap on eBay (thanks for the tip @k5em !) using 3.3v logic levels. tl;dr I needed a 2-stage high-side driver for each side instead of a single low-side transistor. The "click" sound is the switch changing positions and the green LED shows the actual pulse that is sent (100ms).
This is part of a larger project to try to bring FT8 and MSK144 to analog FM transceivers (paired with an RTL-SDR), much like how MMDVM brought M17/DMR/D-Star/YSF/NXDN to analog FM transceivers. If successful, it should drive down the cost to set up a station for the #hamsci Meteor Scatter QSO Party (because it's now legal to use MSK144 on 10m!) that's coming up in August and December.
Here's some helpful links:
"2SE1T11" model coaxial switches on eBay https://www.ebay.com/sch/i.html?_nkw=2se1t11
blog post "Low-side vs. High-side Transistor Switch" https://www.baldengineer.com/low-side-vs-high-side-transistor-switch.html
see the third schematic on this page https://gammon.com.au/motors
Meteor Scatter QSO Party https://hamsci.org/article/save-dates-hamsci-meteor-scatter-qso-party
"2SE1T11" model coaxial switches on eBay https://www.ebay.com/sch/i.html?_nkw=2se1t11
blog post "Low-side vs. High-side Transistor Switch" https://www.baldengineer.com/low-side-vs-high-side-transistor-switch.html
see the third schematic on this page https://gammon.com.au/motors
Meteor Scatter QSO Party https://hamsci.org/article/save-dates-hamsci-meteor-scatter-qso-party
Rue Mohr@kwest_tech @k5em http://ruemohr.org/~ircjunk/tutorials/elex/qwhathow.html
for bipolar transistors, made a long, long time ago.