118275-30-19 at 50 db TABLE 5.-Pass Band-width at Designated Levels below Pass Maximum at 40 db at 60 db at 30 db (a) (b) Sending and receiving band filters, 425 cycle.-Voice frequency carrier telegraph system for cables, Hamilton Nyquist, Long & Phelps, A. I. E. E., March 1925. (c) (a) and (b) combined. (d) (e) Sending and receiving band filters, 1,105 cycle. (g) and (h) combined. (j) Band-pass filter, 4.06 to 6.83 kc.-Carrier telephone system for short toll circuits, Black, Almquist & Ilgenfritz, Trans. A. I. E. E. January 1929. (k) 1,200 cycle, low-pass filter. (1) 3,000 cycle, low-pass filter.-Carrier systems on long-distance telephone line, Affel, Demarest & Green, A. I. E. E., June 1928. (m) 3,300 cycle, low-pass filter.-Black, Almquist & Ilgenfritz. (n) 3,300 cycle high-pass filter.-Black, Almquist & Ilgenfritz. (d) and (e) combined. (h) Sending and receiving band filters, 1,735 cycle. |