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TM 11-5920-252-24
SECTION III. PRINCIPLES OF OPERATION
Section Contents
Paragraph
Functional Description ................................................................
1-10
Function of Arrester Parts ...........................................................
111
1-10.
FUNCTIONAL DESCRIPTION
NOTE
What is shown is a typical use of the arrester. All CHANNEL circuits are the same. Only Channel 1 is
shown. A system is the entire input and output of one arrester.
INPUT AND OUTPUT CIRCUITS
Each Input line is an unbalanced Input (with reference to ground or another zero reference point).  Each arrester
CHANNEL has four input lines and together form a balanced 4-wire Input CHANNEL. The Input signal arrives at the
shelter SIGNAL ENTRANCE BOX. (As shown, the 4WT and 2WT/R are a type of binding post connector.) Switch S1
connects the Input signal to the arrester. Any unwanted high induced voltage arriving with the input signal would be
removed or attenuated by the arrester. The output signals from the arrester J1, J2 and J3 connectors are applied to the
shelter equipment.
1-11
FUNCTION OF ARRESTER PARTS
SPARK GAP
Each input line has a spark gap (ionizing tube) which contains radioactive material between its elements. The radioactive
material within the spark gap will very quickly cause ionization to take place when an extremely high, rapidly rising voltage
is present on the input line. The ionization places a low resistance through the spark gap to ground reducing the high
induced line voltage to a low level. The high, rapidly rising voltage could be a high altitude nuclear explosion or lightning
from electrical and thunderstorms.
RADIO FREQUENCY INTERFERENCE (RFI) FILTER
Input rf signals above the required frequency of the signal equipment will be attenuated (reduced in amplitude level). High
rapidly rising Input voltages have an Inherent high frequency component which will be attenuated by the rfi filter.
The diodes are two diodes with their cathodes connected together. With a given voltage polarity applied to the diodes, one
will present a high resistance the other a low resistance. When an applied voltage exceeds about 170 volts, the high
resistance diode will start to break down and conduct current through the low resistance diode. The diodes, together
prevent the applied voltage from exceeding about 170 volts.
1-10

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