Broadband spectra of J1819+3845 for two epochs around 2000.0 and 2006.0. At most frequencies data at closely contemporaneous dates could be used. Data used in the construction of these spectra came from WSRT, VLA, VLBA, and JCMT observations presented in this paper, and from Moloney (2010, his Table 3.3, 8–43 GHz, VLBA). The lowest frequency data were taken in 1996 (92 cm) and 2005.3 (85 cm).The uncertainties on the data points are dominated by flux scale errors, which are typically a few per cent.