The last show goes out this Saturday, after 11 years.
The former Isle of Wight based presenter specialised in feel-good, happy tunes, many from the glam rock era.
The slot is being replaced by Clued Up, a treasure hunt style programme hosted by Lucy Ambache.
You can still catch Alex Dyke on the Radio Solent airwaves — on Saturday and Sunday nights from 10pm to 1am.
Alex told fans on his Facebook page: "I wanted to let you know I’m moving to night time radio.
"I’ve loved presenting the Saturday Morning show. It’s been a huge part of my life for the last 11 years and I would like to thank the BBC for giving me the opportunity to program all the music, and together with you guys build a wonderful feel good radio show just right for a Saturday morning. It’s been a real privilege.