1-3
1.2
DESCRIPTION
The six base station configurations are based on either the LCD with keypad entry transceiver (TiL
91-DE/8.33) or six channel (TiL 90-6R/8.33) pre-programmable transceiver configured for 7 Watt, 15
Watt or 25 Watt operation. All systems are configured for use of optional Line Interface/Control boards
for remote operation. Each base station consists of a Transceiver, Power Supply Module, RF Amplifier
Module, Microphone and Control Board (optional).
Refer to Table 1-1 for system configuration details.
To improve the rejection of interfering signals, dual conversion receiver technology has been
incorporated on the Transmitter/Receiver (Module A1) board used in Technisonic VHF/AM base
stations. The second IF is 455kHz using a ceramic filter, which is immune to high energy
ringing. The dual conversion module also has a second local oscillator, second mixer and
ceramic filter. The first local oscillator is the original VCO.
The dual conversion receiver board, P/N 003494-1 was implemented into TBS and TSC series base
stations starting in January 2001. An option label on the chassis will indicate OPTION 94 if the dual
conversion board is installed. It is possible to retro-fit the dual conversion receiver/transmitter board
into older TSC/TBS series base station employing the single conversion board. Please contact
Technisonic for availability of an exchange board. Note:
If a new A1 Module has been retrofitted the squelch circuit must be aligned for the receiver
squelch to operate correctly.
The dual conversion receiver’s squelch knob must be rotated significantly more clockwise (4
o’clock position) to obtain the same squelch setting (3uV) as a single conversion receiver’s
squelch knob set to the 12 o’clock (straight up) position.
If the dual conversion receiver’s squelch knob is set to the 12 o’clock position, signals with a
level greater than 0.5uV will open the squelch. At most airports this will not be an adequate level
of squelch. Please be aware of this squelch knob adjustment variance when setting and/or
comparing squelch levels of dual conversion vs. single conversion base stations.
1.2.1
Transceivers -
Models TiL-91-DE/8.33 and
TiL-90-6R/8.33
The basic model of each transceiver is required for the 7 Watt Base Stations. Option 1 indicates that
the basic transceiver has a DC to DC convertor (Module A6) installed to facilitate operation with the
RF Amplifier Module. Refer to Section 3 for specific details on the Transceiver unique to the systems
indicated on the front cover of this document.
1.
Transceiver Model TiL-91-DE/8.33, P/N 901006-2
with Option 8.33
Transceiver Model Til-91-DE/8.33, Part Number 901006-2 with Option 8.33, is a microprocessor
controlled, 7 watt VHF/AM transceiver operating over the entire band of 117.975 to 138.000 MHz in
25 or 8.33 kHz steps. The transceiver will store (25) user selected frequency channels in addition to
the resident emergency channel of 121.500 MHz. Frequency Selection, Storage, Recall, Channel
Scan, Search, and Toggle modes are all selected by the 12 key keypad. Current operating frequency
is displayed on a backlit liquid crystal display (LCD).
2.
Transceiver Model TiL-90-6R/8.33, P/N 861605-2
with Option 8.33
Transceiver Model 90-6R/8.33, Part Number 861605-2 with Option 8.33, is a 7 watt VHF/AM
transceiver which operates in simplex on six preprogrammable, frequency synthesized channels, with
25 or 8.33 kHz channel spacing in the frequency range 117.975 MHz to 138.000 MHz.
1.2.2
Power Supply Modules - Models SPG-007, SPG-015, SPG-025
The Power Supply Modules provide the DC supply voltage to the Transceiver and Linear Amplifier,
and houses a battery charger which can provide charging and trickle charging to external
rechargeable batteries. Model SPG-007 is for use in the 7 Watt configurations, Model SPG-015 is for
use in the 15 Watt configurations, Model SPG-025 is for use in the 25 Watt configurations.
