We’ve recently received our L24TX Transmit Converter from Down East Microwave. The unit is compact, simple, and produces up to 25W output in the satellite section of the 23 cm band (1260 MHz – 1270 MHz, actually 24 cm). The L24TX is a transmit-only device that is intended to enable L-band uplinks for Satellite use. This article is about our most recent project which involved integrating the L24TX into our Flex Satellite SDR System to enable L-Band Satellite operation …
Source: Satellite Station 4.0 Part 10 – Adding 23 cm To Our Satellite SDR
We are making progress on our project to enable remote Satellite operation via the Internet. The latest step is the addition of L-band (24 cm) uplink support to our Flex Satellite SDR System.

We’ve also made some good progress on custom software to link MacDoppler and our Flex Radio Satellite System via the Internet.
The article in the link above shares information about how to go about adding Transverters and Band Transmit Converters to a Flex SDR. the step needed to configure the Flex SmartSDR software, as well as links, cover other aspects for our Satellite System 4.0 Project are included.
You can read the latest updates about this project via the link above.
Fred, AB1OC