  A 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.
