840 
(BE) Plate 6; Comparison of Measured and Calculated Steady-State 
Response of 955 ft. Simplex Cable with R-C Termination. 
(F) Plate 7; Calculated Step-Transient Cable Response. Terminating 
Capacity Equal to Cable Capacity. 
(G) Plate 8; Calculated Step-Transient Cable Response, Terminating 
Capacity Two Times Cable Capacity. 
(H) Plate 9; Calculated Step-Transient Cable Response, Terminating 
Capacity Four Times Cable Capacity. 
(I) Plate 10; Calculated Step-Transient Cable Response, Terminating 
Capacity Six Times Cable Capacity. 
(J) Plate 11; Oscillograms of Step-Transient Response of Lampson 
Cowpensation Network. 
The R-C Termination Circuit 
1. The circuit dealt with here is the simple compensation network 
developed by Lampson (see reference b). It is shown in Plate 1. Double - 
ended compensation is not considered here because of the inconvenience of 
placing compensation network components at the gauge location in practical 
underwater field work. Moreover, the simple single-ended compensation network 
yields superior initial peak response and can be adjusted for satisfactory 
steady-state and transient response characteristics. 
Plate 1. Lampson Compensation Network. 
The notation is that given in reference (a). The cable is assumed to be ideal 
in the calculations, so that losses due to series resistance and shunt conduct- 
ance are neglected. The cable constants are the characteristic impedance R 
and the capacity C of the total cable length. The voltage V, and the small 
capacity C, represent the gauge used at the input end of the cable. The 
terminating resistance R, is given as k times the characteristic impedance R 
of the cable. The terminating capacity C, is given as m times the cable 
capacity C for the total cable length. the output voltage is V;. 
ae All calculations and measurements are for single-ended circuits. 
In applications where double-ended or push-pull circuits are involved, the 
data presented here refer to one side only of the double-ended circuit, which 
one NOIM 10467 
