Bruel Kjaer Microphone Carrier System 2631

Hello everybody.

I have this RF microphone system with 4147 microphone and UA0271 adaptor.
First of all, can i even use this device for instrument (acoustic guitar) recording ?

If yes, i have some issues with noise level. I can barely hear sound from the recording. Its too noisy. So if somebody has any experience with this system, please respond.

Thank you.