Reloj,eh? We might have this one solved.
1710 is the third harmonic of 570. Reloj was strong and in the clear on 570 last night,and faintly in the background on 1710 in the same period,with a man and a woman reading the news. The male announcer had a distinctive voice,a bit gutteral,which made it easy to put two and two together when switching between the two frequencies.