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We present follow‐up observations of 97 point sources from the  Wilkinson Microwave Anisotropy Probe  ( WMAP ) 3‐yr data, contained within the New Extragalactic  WMAP  Point Source catalogue between  −4°≤δ≤ 60° ; the sources form a flux‐density‐limited sample complete to 1.1 Jy  (≈5σ)  at 33 GHz. Our observations were made at 16 GHz using the Arcminute Microkelvin Imager and at 33 GHz with the Very Small Array (VSA).  94 of the sources have reliable, simultaneous – typically a few minutes apart – observations with both telescopes. The spectra between 13.9 and 33.75 GHz are very different from those of bright sources at low frequency: 44 per cent have rising spectra  (α 33.75  13.9  &lt; 0.0) , where   S ∝ν −α  , and 93 per cent have spectra with  α 33.75  13.9  &lt; 0.5 ; the median spectral index is 0.04.  For the brighter sources, the agreement between VSA and  WMAP  33‐GHz flux densities averaged over sources is very good. However, for the fainter sources, the VSA tends to measure lower values for the flux densities than  WMAP . We suggest that the main cause of this effect is the Eddington bias arising from variability.

Follow‐up observations at 16 and 33 GHz of extragalactic sources from WMAP 3‐yr data: I – Spectral properties ★