Analogue to bluetooth

Hi all
I'd like to convert my Marantz Reciever (SR 48) to output a bluetooth signal so that I can listen to my CD's and records on a bluetooth speaker whilst outside.
Has anyone done such a thing? I already have a converter to plug my phone or ipad into the amp but I'd like to go the opposite way.
Regards John L.
 
Look for that kind of transmitter on shopping sites, RCA input and bluetooth out.
Or just copy the files on to an old phone or tablet, and send files from that to the speaker.
I would simply run long wires from the receiver to the speakers, maybe put them in damp proof housings outdoors.
No Bluetooth issues.