. The Bell System technical journal . ng, while the solid lines are for one with limiting. As shown, a givenlarge input would produce an output of Ei, the difference between thesignal voltage and guard voltage components, for the former case andan output of E^, which is about half as much, for the latter case. Thiswill be less likely to operate the receiver when applied for a short intervalof time, although either will produce an operation if applied long enough,because either exceeds the just operate value Ei . Having established the basic design parameters of sensitivity, band-width, guard t
. The Bell System technical journal . ng, while the solid lines are for one with limiting. As shown, a givenlarge input would produce an output of Ei, the difference between thesignal voltage and guard voltage components, for the former case andan output of E^, which is about half as much, for the latter case. Thiswill be less likely to operate the receiver when applied for a short intervalof time, although either will produce an operation if applied long enough,because either exceeds the just operate value Ei . Having established the basic design parameters of sensitivity, band-width, guard to signal ratio, limiting characteristics and speed of re-sponse it is important to know the relationship between signal imitationand the frequency used for signaling. To obtain information on this subject a series of tests were made usinga number of guard channel receivers as nearly alike as possible except forthe frequencies of signal response, which were 800, 1,350, 1,800, 2,400 1316 THE BELL SYSTEM TECHNICAL JOURNAL, NOVEMBER 1954. ^ GUARDVOLTAGES Fig. 3 — Limiter characteristics. o 0
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