Qual Tron QTI-EMIDS User Manual Table of Contents

Download:
Mirror Download [FCC.gov]
Document ID	33118
Application ID	7w7UO/lLF5xmd3hJl7zyhQ==
Document Description	Users Manual Table of Contents
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	64.69kB (808644 bits)
Date Submitted	1999-04-19 00:00:00
Date Available	1999-07-09 00:00:00
Creation Date	2001-06-28 08:03:50
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	2001-06-28 08:03:51
Document Title	Users Manual Table of Contents

THEORY OF OPERATION
POWER AMPLIFIER ASSEMBLY
Driver Amplifier
The driver amplifier section provides the following function.
* Amplifies the output signal of the synthesizer.
* Matches the low impedance of the power amplifier.
* Provides some attenuation of harmonics.
Power Amplifier
The final power amplifier further amplifies this signal to the
specified output level.
Low Pass Filter
The low pass filter provides the following functions:
* Attenuates harmonics by approximately 50 dBm.
* Matches the final power amplifier to 50 Ohms.
Power Supply
The power supply section provides a means of switching DC power
to the final stage of the Power amplifier.
SYNTHESIZER LO ASSEMBLY
Crystal Oscillator
A fundamental frequency crystal oscillator is operated in a
Colpitts temperature-compensated circuit to give a stability of (2.5
PPM over the operating temperature range. The 12.8 MHz output of the
TCVCXO drives the PLL chip. The PLL chip divides this frequency, to
establish a reference frequency. This frequency is the reference
(frequency) for phase comparison used internally in the chip as well as
providing the channel spacing. The low frequency component of the
modulating signal is used to modulate of the TCVCXO, for improved DC
response.
Voltage controlled Oscillator "VCO"
The VCO operates at the output frequency and is controlled by
applying a voltage to the voltage variable capacitor. The oscillator is
tuned to the center of the operating frequency range so the voltage on
the capacitor is compatible with the output range of the low pass
filter.
Phase Locked Loop "PLL"
The PLL compares the VCO frequency, divided by the dual-modulus
divider and internal dividers, to the reference frequency and outputs a
series of correction pulses to the low pass filter to correct the VCO
frequency.
Dual Modulus Pre-Scalar & Buffer
Dual Modulus operation will not be described here, since
operation of this circuit is explained in great detail in common
technical literature.
A simplified explanation of dual modulus circuit operation is
that it is an additional frequency divider used by the PLL. The buffer
provides isolation to prevent switching spikes from getting back into
the VCO and erroneously modulating the output frequency.
Modulation Filter
The modulation signal is passed through an active filter which
attenuates all audio signals above the cutoff frequency, resulting in
an improved signal to noise ratio.
Modulation Attenuation Circuit
The Modulation Attenuation Circuit consists of several resistors
that may be switched in and out of the circuit to control the
modulation level across the operating bandwidth of the Transmitter.
Encoder
Microcontroller
The microcontroller includes Eprom, EEprom, Ram and various
peripheral devices to accomplish the task required of the encoder.
Additional Support Circuitry
The following are some of the support circuits associated with
the encoder:
* Sensor Interface circuit.
* Power Supply circuit.
* User interface circuit (Switches and Pushbutton).
* External state of health timer.
* Low Battery detection circuit
* Low voltage reset circuit.
* Serial communications circuit (RS-232).


---

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.2
Linearized                      : Yes
Create Date                     : 2001:06:28 08:03:50
Producer                        : Acrobat Distiller 4.0 for Windows
Modify Date                     : 2001:06:28 08:03:51-04:00
Page Count                      : 6

EXIF Metadata provided by EXIF.tools