Atec Tektronix-1502 - Manual (Page 26)

TM 9-4935-601-14-3&P
THEORY OF OPERATION
This section describes the circuits of the 1502 using a combination of block and circuit diagrams on pull-
outs from the back of this manual.
Block Diagrams
There are two block diagrams that show the overall functions of the 1502; Fig. 3-1, a simplified version,
and the main block diagram located on a pull-out.
Circuit Operation
The 1502 uses pulses to check cable conditions. The Pulser circuits transmit the pulses down the cable
under test, and the Sampler circuits sample the reflections and provide the vertical signal for display on the crt.
The Pulser is basically a tunnel diode in a 50
Ω
strip line (cavity). It contains all biasing and timing
circuits required for operation of tunnel diode, CR1703.
Figure 3-1. Simplified Block Diagram-1502
REV A FEB 1980
3-1