M2259-00-200-812 Tait Orca Portable (TOP) Encryption 15
Copyright TEL Encrypted Radio Programming and Service Manual
4 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 Transcrypt or
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.
Note: Module component values change between TOP and T2000 radios. Ensure the module
fitted has been configured for the TOP radio. See the encryption manufacturer’s service
manual for more information.
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’ indicating when transmitting or receiving encrypted
signals (Transcrypt modules) or if the encryption state is ON (Midian modules).
4.1 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.
Links (not shown on the block diagrams, see the circuit diagram on page 21) allow the radio
to function as a standard, unencrypted radio when an encryption flex is fitted with no
module. To enable the radio to operate when a module is not fitted (-06 flex version only),
solder-short Link-6 and Link-7 to loop the audio back to the normal radio path. Radios with
-07 (or later version) flexes fitted do not require these links fitted.
The existing flex circuit that connects the Main PCB to the 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.
Signal levels and pin assignments.
Function Mode Name Pin Module TOP Radio
Power Supply V+ 1 5V regulated
Reset I/P RS 2 Active low Resets whenever supply lower
than 4.75V
Tx pressel I/P PTT 3 Active low CMOS
Busy I/P RX 4 Active low CMOS
Mode I/P MO 5 Active low Momentary or level sensitive
Data to Scrambler I/P D-SC 6 Hardwired module
programming I/P
If reqd.
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