This video shows some of the maintenance required for a HF (AKA Shortwave) broadcast station. It starts with transmission line tensioning, some shots of a curtain array then goes on to show the inside of a transmitter building. Transmitters shown are Harris HF-100 (a 1980’s model tube type PDM design) and Continental 418, but I didn’t see the letter number. They are likely tube modulated units.
These are from the international service of Australia Broadcasting Corporation (ABC), or Radio Australia International.
What is he pouring into the Harris cabinet? Distilled water?
Yes, the Harris HF-100 uses vapor cooled tubes