c. The SNAP-1 combines signals received from two separate antennas to
create a radio reception pattern containing a null. The SNAP-1 effectively
becomes the antenna control system and must interface and operate with the
radio. The SNAP-1 also:
It does this without interfering with the desired signal coming from a
(3) Can automatically block signals, even when the operator does not
know the jammer's location or when the jammer is moving.
(5) Allows passing of the desired signal.
This occurs even when the
PART C - SIGNAL SECURITY MEASURES
Signal Security. A close relationship exists between ECCM and SIGSEC.
When an enemy does not have access to or knowledge of EEFI, his
effectiveness is reduced. SIGSEC's major function is to deny an enemy the
ability to exploit friendly electromagnetic spectrum use.
security, and physical security.
Emission Security and Control. This involves preventing an enemy from
targeting friendly communications. If enemy EW units do not know a friendly
unit is present, they cannot target it. Denying an enemy the ability to
a. Turn on emitters only to meet minimum requirements.
b. Use the minimum amount of power needed to pass information.
d. Use directional antennas.