Electrical-resistivity (ρ), specific-heat (c), and magnetization (M) measurements were carried out for the series of compounds La1-xYbxCu3Al2(0<=x<=1). The resistivity results show two regions with a -ln T behavior, with different slopes that allows an estimation of the crystal-field (CF) splitting. Starting at x=1, the susceptibility is reduced to x=0.4, and this can be explained by the CF effect. Using the specific-heat and magnetic-susceptibility data, we were able to determine the Kondo temperature (TK), the crystal-field splitting, and the Debye temperature (θD) for the whole series. TK was found to increase with the Yb concentration and with the corresponding unit-cell volume contraction. This behavior suggests the increase of the product \|Jn(Ef)\| when the volume is reduced. This is the same trend found in Ce compounds, which is unusual for Yb compounds.