Exhibit 12.1 Communications Instruments, Inc. Computation of Ratio of Earnings to Fixed Charges (Dollars In Thousands) (Unaudited) ------------------------------------------------------------- Year Year Year Year Year Ended Ended Ended Ended Ended 12/31/95 12/31/96 12/31/97 12/31/98 12/31/99 -------- -------- -------- -------- -------- Earnings (Loss) Before Taxes and Minority Interest $ (2,498) $ 2,782 $ 6,938 $ 5,355 $ (3,244) -------- -------- -------- -------- -------- Fixed Charges: Interest Charges 2,172 3,139 5,243 11,835 16,863 Amortization of Financing Costs 137 252 401 724 1,085 Environmental Interest -- 147 119 113 119 Estimated Interest Factor of Rental Expense 40 272 351 532 532 -------- -------- -------- -------- -------- Total Fixed Charges 2,349 3,810 6,114 13,204 18,599 -------- -------- -------- -------- -------- Total Earnings Available for Fixed Charges (149) 6,592 13,052 18,559 15,355 ======== ======== ======== ======== ======== Ratio of Earnings to Fixed Charges N/A 1.7x 2.1x 1.4x 0.8x Page 1