Midian Encryption Programming and Service Manual Tait Orca Portable (TOP) Encryption 27
June 2006 © Tait Electronics Limited
3 Tait Orca Portable (TOP) Encryption
Tait Orca Portable (TOP) radios can be encryption-enabled at a Tait
Authorised Service Centre using the TOP Encryption Upgrade Kit (IPN
TOPA-EA-001) and a supported Midian Encryption Module. This kit
comprises a flex circuit which brings all the required connections for
encryption to a single connector for plug-in encryption functionality. Full
fitting instructions for the flex are included in this manual.
3.1 User Interface
This is a hardware and firmware solution. It offers:
■ user control of Encryption state (On or Off) by any Function button,
programmed by the user, with either short or long press activation
■ menu access to Encryption state (where menu function is available)
Where the radio has both a display and a keypad, it also provides:
■ encryption state by text on the radio display
■ user control of up to 16 encryption codes by keypad
■ continuous display of the currently selected encryption code
■ programmable control of the number of user accessible codes
■ display of the ‘accessory triangle’ if the encryption state is ON.
3.2 Circuit Operation
Functions of the interface are:
■ Transmit and receive audio is intercepted by the flex, where C572 and
C567 are removed. Audio passes through the encryption module and is
encrypted or not according to the encrypt state.
■ The standard TOP flex circuit that connects the TOP Main PCB to the
TOP User Interface PCB is discarded, and is replaced by the Encryption
Flex circuit.The low voltage reset from the radio is used to reset the
module circuit.
The diagram that follows shows the encryption circuit operation for both a
TOP encrypted radio and a TOP radio as a programming radio.
When using a TOP radio as an OTAR programming radio, ensure
encryption mode is turned off.
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