SAC SE SERIES, Инструкция по установке и настройке

Страница: 66 / 149

SOUTHERN AVIONICS COMPANY
SE Series Installation and Setup 4-2 Master Control Panel Description
The Master Controller Panel is the main control panel for the SE series transmitters. The
following gives directions on how to operate the SE transmitter using the Master Controller Panel
keypad. The Master Controller keypad consists of 30 keys, 23 LEDs, a 4 line by 40 character
LCD display and dual analog meters.
Definitions:
Meters
The upper analog meter monitors the following three functions:
•
Forward Transmit Power - This gives an indication of how much radio frequency transmit
power the SE transmitter is sending to the ATU.
•
Reflected Transmit Power - This gives an indication of how much, of the forward power, is
being reflected back to the transmitter from the ATU because of mismatches in the antenna
impedance.
•
Modulation - This gives an indication of the modulation index.
The lower analog meter monitors the following two functions:
•
Power Amplifier Voltage (PAV) - This gives an indication of the voltage applied to the final
FETS in the Switching Power Amplifier .
•
Power Amplifier Current (PAI) - This gives an indication of the current flowing through the
final FETS in the Switching Power Amplifier.
Taking these two values and multiplying them together will give an indication of the power input to
the final FETS.
SPA Power Input = PAV * PAI
The efficiency of the Switching Power Amplifier is calculated by taking the forward transmit power
from the upper meter and dividing this number by the calculated SPA power input to the final
FETS.
Efficiency (%) = (Forward Transmit Power)/(SPA Power Input) * 100%
Keys/LEDs
Frequency Key (FREQ) - This key sets the transmitting frequency of the transmitter. The
transmitter can be set to the desired frequency by pressing the FREQ key, then entering the
desired frequency using the numeric keys and then pressing the ENTER key. Although the
transmitter can cover any frequency from 190.0 KHz to 1800.0 KHz, the Filter/Monitor module
must be configured for the desired frequency.
Tone Key (TONE) - This key sets the tone frequency of the Identifier. The frequency can be
toggled to either 400 Hz or 1020 Hz using the tone key.
Call Sign Key (Call Sign) - This key allows the user to enter the identifier of the station. An
alphanumeric identifier up to 8 characters may be used. The default call sign is "SAC". Using
the numeric part of the keypad, the user may enter the identifier. This type of entry is identical to
text messaging on a cell phone. To begin this procedure, the operator presses the call sign key.
The present call sign, if present, will clear to all blanks. The most significant character is entered