PBS Production Guidelines
The Technical Specifications are in the TOS Submission PDF under the Technical Operating Specifications header.
https://www.pbs.org/about/producing-pbs/red-book/
PBS Technical Operating Specifications (modified for NOVA 3/23/2022)
APT Technical Specifications
https://www.aptonline.org/aptweb.nsf/votherdocs/services-technical+specifications
Overview
Content Tools
Apps