1-2
1.2
DESCRIPTION
- continued
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 all transceivers capable of
supporting 8.33kHz or 25kHz channel spacing. An option label on the chassis will indicate OPTION
8.33 if the dual conversion board is installed.
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,
TiL-90-6R/8.33,
The basic model of either transceiver is provided for the 7 Watt Base Stations. An optional 9-
pin "D" connector (Option 2) is available on each transceiver to facilitate remote operation.
Refer to Section 4 for specific details on the Transceiver Model unique to the System indicated
on the Front Cover of this document.
1.
Transceiver Model TiL-91-DE/8.33, Part Number 901006-2, Opt. 8.33
Transceiver Model Til-91-DE/8.33, is a microprocessor controlled VHF/AM 7 watt transceiver
operating over the entire band of 117.975 to 138.000 MHz in 25 kHz 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, Part Number 861605-2, Opt. 8.33
Transceiver Model 90-6R/8.33, is a 7 watt VHF/AM transceiver which operates in simplex on six pre-
programmable, frequency synthesized channels, with 25kHz or 8.33kHz channel spacing in the
frequency range 117.975 MHz to 138.000 MHz.
1.2.2
Power Supply/Battery Charger - Model SPG-010, P/N 911008-1
The Model SPG-010 converts 120 VAC to provide the 13.7 VDC supply voltage to the Transceiver
and houses a battery charger which can provide trickle charging to external rechargeable batteries,
if connected to the terminal block on the rear of the unit. When external batteries are connected the
unit will automatically revert to DC operation if the AC main power fails. A 220Vac version of the
SPG-010 can be specially ordered.
Содержание TiL-90-6R/8.33
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