They had 4 ch uhf. CH1-Main 460.025,ch2-460.075-secondary,ch3-460,125,ch4-460.175 dl checks.The fire dept had 3 chs-ch1-453.05,ch2-453.1 ,ch3-453.125(eoc). This is from memory may not be right . They went to edacs,that is used today. around 1987. Info on the edacs system is on this site.