Introduction
1-5
TW7000TX: The TW7000TX is a transmitter only. It includes the
full transmitter functions of the TW7000, excluding the receiver fea-
tures.
TW7000 Internal Options
Several internal options are available for the TW7000. These include
the following:
7000ACH: Increases operational channels to 1000.
7000ALE: Automatic link establishment (ALE) includes link quality
analysis, auto linking, sounding, and order-wire message transmission
and reception.
7000CLK: Internal clock keeps and displays the time and enables the
alarm features.
7000ENCR: High-level voice encryption uses enhanced domain
transform (EDT) ciphering techniques providing long-term security.
7000HS: High-stability reference oscillator allows a 0.1 part per mil-
lion frequency stability.
7000NB: Impulse-type noise blanker used in high-voice environ-
ments.
7000RCDR: Combines receive and transmit audio and routes them to
Accessory 2.
7000RF: Internal modem allows remote contact from the TW7201F
FSK controller.
7000RI: Internal modem allows remote contact from the TW7201I
ISDN controller.
7000RS: Modem interface board configures a second serial port
(RS422/485) to provide data protocol for external control of the radio
through a computer. This is in addition to the standard RS232 inter-
face.
7000TC: Digital selective calling system includes automatic path
evaluation. It combines all functions of Selcall, Transcall, and Trans-
Adapt.
7000VEM: DSP-based voice enhancement provides superior voice
recognition and signal-quality improvement in noisy environments.
7000WB1: Wideband data filter providing 300 to 3300 Hz with tai-
lored group delay characteristics for data operation.
