ALTERNATE METHODS

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.

Electrical

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. These circuits are:

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.

l PIGEON POST provides a method of traffic delivery to shore by aircraft;

l 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 transmission.

SUMMARY

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.