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The spectra of fast radio bursts (FRBs) encode valuable information about thesource's local environment, underlying emission mechanism(s), and theintervening media along the line of sight. We present results from a long-termmultiwavelength radio monitoring campaign of two repeating FRB sources, FRB121102 and FRB 180916.J0158+65, with the NASA Deep Space Network (DSN) 70-mradio telescopes (DSS-63 and DSS-14). The observations of FRB 121102 wereperformed simultaneously at 2.3 and 8.4 GHz, and spanned a total of 27.3 hrbetween 2019 September 19 and 2020 February 11. We detected 2 radio bursts inthe 2.3 GHz frequency band from FRB 121102, but no evidence of radio emissionwas found at 8.4 GHz during any of our observations. We observed FRB180916.J0158+65 simultaneously at 2.3 and 8.4 GHz, and also separately in the1.5 GHz frequency band, for a total of 101.8 hr between 2019 September 19 and2020 May 14. Our observations of FRB 180916.J0158+65 spanned multiple activitycycles during which the source was known to be active and covered a wide rangeof activity phases. Several of our observations occurred during times whenbursts were detected from the source between 400-800 MHz with the CanadianHydrogen Intensity Mapping Experiment (CHIME) radio telescope. However, noradio bursts were detected from FRB 180916.J0158+65 at any of the frequenciesused during our observations with the DSN radio telescopes. We find that FRB180916.J0158+65's apparent activity is strongly frequency-dependent due to thenarrowband nature of its radio bursts, which have less spectral occupancy athigh radio frequencies ($\gtrsim$ 2 GHz). We also find that fewer or fainterbursts are emitted from the source at high radio frequencies. We discuss theimplications of these results on possible progenitor models of repeating FRBs.

Multiwavelength Radio Observations of Two Repeating Fast Radio Burst Sources: FRB 121102 and FRB 180916.J0158+65