Comtech Telecommunications Corp. Thursday reported third quarter net sales declined 19.4 percent to $71.6 million versus the year-ago period, as gains in mobile data failed to offset declines in the transmission and microwave amplifier businesses. After the market close, the Melville company posted net income of $5 million, or 30 cents per diluted share, for the three months ended April 30... Comtech Telecommunications Corp. Thursday reported third quarter net sales declined 19.4 percent to $71.6 million versus the year-ago period, as gains in mobile data failed to offset declines in the transmission and microwave amplifier businesses.