2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/900A search for radio recombination lines near 20 cm at z=0.193 and z=0.886 towards the gravitational lens system PKS 1830-211 has yielded upper limits on the line optical depth of 5 x 10^{-5} and 5 x10^{-4} at the two redshifts respectively. Based on the non-detections, we derive upper limits to the emission measure of the ionized gas in the absorbing systems. We also present continuum flux density measurements over the frequency range 0.3-45 GHz made at a single epoch.2 pages with 2 figures, Latex format, to appear in the proceedings of IAU 199, "The Universe at Low Radio Frequencies" held in Pune, India, ASPAstrophysicstext