Left: GMRT 240 MHz image of A 1682 at the resolution of 12.5′′ × 9.2′′, p.a. 55.7°. The 1σ rms in the image is 0.6 mJy beam^-1. Red contours start at 2 mJy beam^-1 and scale by a factor of 2. Black dashed contours correspond to the − 2 mJy beam^-1 level. Individual radio galaxies are labelled S1, S2 and S3. The optical image is the red plate of the Digitized Sky Survey (DSS-2). Right: GMRT 240 MHz contours overlaid on the VLSS 74 MHz emission (grey scale). The resolution of the 240 MHz image is 18.3′′ × 14.0′′, p.a. 21.7°. Black contours start at 2 mJy beam^-1 (1σ = 0.6 mJy beam^-1) and are spaced by a factor of 2. White contours correspond to the − 2 mJy beam^-1 level.