There will be times when you are unsure of the
exact frequency of the active ordnance. In these
circumstances you will be required to use alternate
methods for communications. The alternate methods of
relaying communications during HERO conditions
include both electrical and nonelectrical relay systems.
To provide an uninterrupted flow of essential
communications without violating HERO and EMCON
limitations, techniques called AUTOCAT, SATCAT,
and MIDDLEMAN were developed. These techniques
extend the range of relay procedures using amplitude
modulation UHF transmission via HF or satellite. In
AUTOCAT, a ship provides the method for
automatically relaying UHF transmissions; in
SATCAT, an airborne platform provides the method. In
MIDDLEMAN, the objective is obtained; however, the
method requires an operator to copy the message with
subsequent manual retransmission.
AUTOCAT, SATCAT and MIDDLEMAN use
three different types of circuit configurations for
reception and relay of UHF transmissions.
A voice circuit where some units send and
receive on one frequency, and other units send
and receive on any other frequency;
A voice circuit where all units transmit on one
frequency and receive on another frequency;
A RATT circuit where all units transmit on one
frequency and receive on another frequency.
Non-Electronic Relay Systems
There are two additional message relay systems.
These systems, which utilize non-electronic relay
systems, are PIGEON POST and BEAN BAG.
PIGEON POST provides a method of traffic
delivery to shore by aircraft;
BEAN BAG provides a method for small ships
to deliver message traffic via helo to shore or to a
unit that is terminated full period for further
EMCON is one of those facets of security that is
required to properly perform your duties within general
security guidelines. You must perform your duties in
such a manner as to protect the integrity and overall
value of secure communications.
We have discussed a number of differing types of
communications, but have not covered procedures in
detail. Use of local instructions, Task Force/Group
battle orders, or other methods of relaying
communications is required.