Table 3 Measured transmission S-parameters (dB) for all implemented filters at the two operating frequencies, i.e. 74.7 MHz for 13C and 297.2 MHz for 1H.

From: Proton-decoupled carbon magnetic resonance spectroscopy in human calf muscles at 7 T using a multi-channel radiofrequency coil

filter 1H band-pass interface box 13C low-pass interface box 13C low-pass Rx chain
number 1 2 3 4 1 2 3 1 2 3
S21@13C −70.4 −67.8 −72.6 −70.1 −0.32 −0.23 −0.27 −0.18 −0.17 −0.19
S21@1H −0.38 −0.37 −0.37 −0.35 −71.0 −71.8 −71.5 −65.5 −72.6 −71.3