. The Bell System technical journal . , bolting the armor clamps to the repeaterhousing and screwing on the domed ends. Fig. 12 shows a completedrepeater connected to a cable. 90 80 /// i \ / t 55 OHM /^ \ N TERMINATIONS ~ *^7 \ \\ \ / 70 /I \ / / / 1 \\ , / / SHORT-CIRCUIT . 11 \ / BOTH TERMINALS , ^N 1 \ vy Li \ 60 \ 1 ■•*> 1 \ 1 n / 1 N 1 > / . l/l / 1 ^ ^y 1 \ iil / / 1/ 50 / ^ ^-j \ . IM«^ [/ f\ V h Il*! / ^****.,^,^^^^^ 1 I . I / ^X \ / 1 ■ > ■ / 30 \ ! l/y \l ^< 11 1 20 1 11 vl 1 11 ■~ -y- TARGET MARGIN - — ^ ~ ■ ~ ^ FOR CABLE FAULT CONDITION 100 1 1 1 1 1 1 1 1 1 1 1 1 1 1
. The Bell System technical journal . , bolting the armor clamps to the repeaterhousing and screwing on the domed ends. Fig. 12 shows a completedrepeater connected to a cable. 90 80 /// i \ / t 55 OHM /^ \ N TERMINATIONS ~ *^7 \ \\ \ / 70 /I \ / / / 1 \\ , / / SHORT-CIRCUIT . 11 \ / BOTH TERMINALS , ^N 1 \ vy Li \ 60 \ 1 ■•*> 1 \ 1 n / 1 N 1 > / . l/l / 1 ^ ^y 1 \ iil / / 1/ 50 / ^ ^-j \ . IM«^ [/ f\ V h Il*! / ^****.,^,^^^^^ 1 I . I / ^X \ / 1 ■ > ■ / 30 \ ! l/y \l ^< 11 1 20 1 11 vl 1 11 ■~ -y- TARGET MARGIN - — ^ ~ ■ ~ ^ FOR CABLE FAULT CONDITION 100 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 4 6 8 10 20 40 60 100 200 FREQUENCY IN KILOCYCLES PER SECOND 400 600 1000 Fig. 16 — Repeater loop loss measured at amplifier input. REPEATER DESIGN — NEWFOUNDLAND-NOVA SCOTIA LINKS 273 mu LUQ z z< o< h- Ocr ORIGINAL BRITISH POST OFFICEMODEL REPEATER. 50 100 )50 200 250 300 350 400 450 500 550 600 FREQUENCY IN KILOCYCLES PER SECOND Fig. 17 — Repeater-gain response. PERFORMANCE The gains and losses of various sections of the repeater are shown inFig. 13. Figs. 14 and 15 show, respectively, the harmonic distortion andthe stabilit}^ characteristics of the amphfier with one and two pathsoperating. The total shunt loss across the amplifier is shown in Fig. 16as a margin above the amplifier gain. The curves show the result with55-ohm terminations on the repeater and with a short-circuit on eachterminal. Fig. 17 shows the production spread in gain of the 16 repeatersfor the system as a deviation from the target value. The highest standarddeviation (at 260 kc) was only db. In all respects the productionrepeaters proved to be very consistent and satisfactory in their per-formance and differed httle from the original laboratory-built model. Typical electrical characteristics of a repeater and the submergedequalizer are showTi in Appen
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
