All Weather Inc 1793 Operation & User’s Manual

Text of All Weather Inc 1793 User Guide:

• All Weather Inc 1793, All Weather Inc. • 1165 National Drive • Sacramento, CA 95834 • USA • 800.824.5873 • www.allweatherinc.com User’s Manual Rev. A Model 1793 VHF Radio FAA APPROVED ECP232 — 2017 Jul 28 NOT FAA APPROVED

• Copyright © 2016, All Weather, Inc. All Rights Reserved. The information contained herein is proprietary and is provided solely for the purpose of allowing customers to operate and/or service All Weather, Inc. manufactured equipment and is not to be released, reproduced, or used for any other purpose without written permission of All Weather, Inc. Throughout this

• All Weather Inc 1793, 1793 VHF Radio User's Manual TABLE OF CONTENTS 1. INTRODUCTION ................................................................................................................. 1 1.1 Description .................................................................................................................................. 1 2. INSTALLATION AND CHECKOUT ..................................................................................... 1 2.1 Setting the Transmitter Frequency .............................................................................................. 1 2.2 Mounting Bracket ..................................

• All Weather Inc 1793, 1793 VHF Radio User's Manual 1 1. INTRODUCTION This publication provides general information on the Model 1793 VHF Radio. The Model 1793 VHF Radio is a single channel, fixed frequency Amplitude Modulated (AM) transmitter operating over the frequency range of 118.000 to 136.975 MHz. The transmitter is intended for base station operation in an air traffic environment. The Model 1793 operates on DC voltage in the range of 11.25 to 16.25 volts. 1.1 DESCRIPTION Each Model 1793 VHF Radio consists of a transmitter board mounted in a heat sink as shown in Figure 1. The transmitter is a low power VHF AM transmitter which can transmit on a single programmable synthesized freque

• All Weather Inc 1793, 1793 VHF Radio User's Manual 1 2. INSTALLATION AND CHECKOUT Before using the VHF Radio, it is necessary to set the operating frequency. 2.1 SETTING THE TRANSMITTER FREQUENCY The operating frequency may be programmed over the frequency range of 118.000 to 136.975 MHz with 25 kHz channel spacing. To access the frequency jumper settings access the bottom of the radio, opposite side of the heat sink see Figure 3. The operating frequency is selected by setting the eleven switches on DS401 and DS402 shown in Error! Reference source not found. and Figure

• All Weather Inc 1793, 1793 VHF Radio User's Manual 3 2.2 MOUNTING BRACKET The CDP rack’s bottom shelf (Figure 5) is fixed in place. Components are accessible through the rack’s front or side doors. The VHF radio is secured to the bottom side of the sliding top shelf using four wing knobs facing up when the VHF radio is viewed from the front end of the CDP rack. Figure 5. CDP Bottom-Shelf Components

• All Weather Inc 1793, 1793 VHF Radio User's Manual 4 The mounting bracket and the VHF radio are installed at the factory. Should the need arise to remove the radio, undo the four wing knobs on either side of the radio. Because of the tight space inside the CDP rack, it is recommended that any connecting cables remain in place until the VHF radio is removed from the siding shelf. Any cables that have been removed should be reattached before mounting the VHF radio back in the mounting bracket. Figure 6 shows how the VHF radio is secured to the siding shelf. Figure 6. VHF

• All Weather Inc 1793, 1793 VHF Radio User's Manual 5 2.3 CONNECTIONS In the All Weather, Inc. AWOS 3000 system, the 1793 VHF radio is installed at the Central Data Platform (CDP). The VHF control cable connects the VHF radio to the AWOS Peripheral Interface PCB at terminal block J2 and the AWOS computer power supply. The cable is fitted with a DB9 connector at one end for connection to the VHF radio. It has four unterminated wires at the other end for connection to the Peripheral Interface. The cable also has a four pin Molex power connector to supply power to the VHF radio from the AWOS computer power. The antenna connector is a 50 ohm "BN

• All Weather Inc 1793, 1793 VHF Radio User's Manual 7 2.4 CALIBRATION The Model 1793 VHF Radio is calibrated at the factory prior to shipment, and should not need to be calibrated again during installation. Power level and modulation calibration are performed as part of the annual revalidation described in the Annual Revalidation Section. 2.5 OPERATIONAL CHECK Ensure that the transmitter operates as described in Chapter 3.

• All Weather Inc 1793, 1793 VHF Radio User's Manual 8 3. OPERATION A view of the front and transmitter indicators is given in Figure 9. A functional description of the power switch, controls, and indicators is provided in Table 1. 3.1 OPERATING VHF RADIO INSTRUCTIONS 1. Ensure that the power, signal, and antenna cables are connected. 2. Set the POWER ON/OFF switch to "ON". 3. Verify that the amber POWER ON LED is ON as shown in Figure 9. 4. Verify that the AWOS station voice message is being transmitted using a

• All Weather Inc 1793, 1793 VHF Radio User's Manual 10 Table 1. Operator's Switches, Controls and Indicators SWITCHES CONTROLS & INDICATORS FUNCTIONAL DESCRIPTION ON/OFF SWITCH The toggle switch applies the DC power to the transmitter. The transmitter is switched to ON in the toggle LEFT position the transmitter is switched OFF in the toggle RIGHT position. PWR LED INDICATOR The PWR AMBER LED Indicates when the POWER ON/OFF switch is set to ON and voltage is applied to the transmitter. PTT AMBER LED INDICATOR The PTT AMBER LED indicates whe

• All Weather Inc 1793, 1793 VHF Radio User's Manual 11 4. MAINTENANCE The Model 1793 VHF Radio requires no maintenance, other than the recommended periodic checks outlined below. If transmission problems should arise, perform the Annual Revalidation procedures described in below. If the problem persists, contact All Weather, Inc. Customer Service. 4.1 PERIODIC MAINTENANCE Periodic maintenance of the Model 1793 VHF Radio is divided into three categories within the maintenance cycle: monthly, triannual, and annual maintenance procedures. 4.1.1 Monthly Maintenance Check t

• 1793 VHF Radio User's Manual 12 4.1.3.1 Power Level (At Transmitter) 1. Remove power from the VHF radio by turning the power switch on the radio front panel off. 2. Disconnect the VHF antenna cable from the BNC connector on the back panel of the CDP. 3. Connect the power meter to the BNC connector on the back panel of the CDP which connects to the V

• All Weather Inc 1793, 1793 VHF Radio User's Manual 13 4.1.3.2 VSWR (At Transmitter) If the RF cables must be disconnected when switching between power level and VSWR tests, turn the radio off using the switch on the radio’s front panel. 1. Remove power from the VHF radio by turning the power switch on the radio front panel off. 2. Disconnect the VHF antenna cable from the BNC connector on the back panel of the CDP. 3. Connect the forward / reflected power meter to the BNC connector on the back panel of the CDP and terminate with the antenna. See

• 1793 VHF Radio User's Manual 14 8. Calculate the VSWR and enter the value on the Annual Technical Performance Record. If you measure forward and reflected power, calculate the VSWR using the following equation. VSW R 1  reflectedpower forwardpower 1  reflectedpower forwardpower Sample Calculation: Reflected power = 0.02 W Forw

• All Weather Inc 1793, 1793 VHF Radio User's Manual 15 4.1.3.3 Frequency If RF cables must be disconnected when switching between frequency and modulation tests, turn the radio off using the switch on the radio’s front panel. 1. Log the assigned frequency on the Annual Technical Performance Record. 2. Remove power from the VHF radio by turning the power switch on the radio front panel off. 3. Disconnect the VHF antenna cable from the BNC connector on the back panel of the CDP. 4. Connect the frequency meter to the BNC connector on the back panel of the CDP and terminate with the antenna or a dummy load 5. Apply power to the VHF radio by

• 1793 VHF Radio User's Manual 16 4.1.3.4 Modulation If RF cables must be disconnected when switching between frequency and modulation tests, turn the radio off using the switch on the radio’s front panel. 1. Remove power from the VHF radio by turning the power switch on the radio front panel off. 2. Disconnect the VHF antenna cable from the BNC connector

• All Weather Inc 1793, 1793 VHF Radio User's Manual 17 Figure 13. Tone Test Panel - AWOS 3000 9. Use the modulation adjustment potentiometer on the VHF radio to adjust the modulation depth to 90%, see Figure 3. 10. Use the VHF adjustment potentiometer (R29) on the CDP peripheral interface board to lower the signal level until the modulation decreases to 80%. Figure 14. VHF Adjustment Potentiometer on CDP Peripheral Interface Board

• All Weather Inc 1793, 1793 VHF Radio User's Manual 18 11. Use the modulation adjustment potentiometer on the VHF radio to adjust the modulation depth to 60%. 12. Set the modulation meter to the “peak hold” mode. 13. Access the Edit > Configuration > Voice tab on the CDP display and click the Modulated 300 Hz tone option in the Test panel. 14. Reset the modulation meter and wait until the modulated tone stops. 15. Verify that the peak modulation reading does not exceed 95%. If it does, adjust the modula- tion adjustment potentiometer on the VHF radio and recheck the peak modulation reading. 16. Access the Edit > Conf

• All Weather Inc 1793, 1793 VHF Radio User's Manual 19 4.1.3.6 Transmission Line Loss 1. Remove power from the VHF radio by turning the power switch on the radio front panel off. 2. Disconnect the VHF antenna cable from the BNC connector on the back panel of the CDP. 3. Connect the power meter to the BNC connector on the back panel of the CDP and terminate with the antenna or a dummy load. 4. Apply power to the VHF radio by turning the power switch on the radio front panel on. 5. Record the VHF radio output power level for the transmitter end. 6. Remove power from the VHF radio by turning the power switch on the radio front panel off. 7. Disconnect the power meter

• All Weather Inc 1793, 1793 VHF Radio User's Manual 20 5. SPECIFICATIONS Parameter Specification Frequency Range 118.000 to 136.975 MHz Channel Spacing 25 kHz Duty Cycle 100% Transmitter Power Output Adjustable (1 to 3 W) Output Power Stability 1 W VSWR 4:1 Carrier Stability (-40 to +55ºC) ±1.000 Hz max Audio Input 0.5 V rms to 2.0 V rms – Line level Modulation Capability Adjustable (50 to 95%) Audio Distortion (90% modulation) 10% max Audio Frequency Response 300 Hz to

• All Weather Inc 1793, 1793 VHF Radio User's Manual 21 6. FORMS These master forms should be copied and sufficient copies stored at a convenient location in each site's Facility Reference Data File (FRDF). The Annual Technical Performance Record is to be completed at system commissioning, after major repair work, and during annual revalidation. AWOS Annual Technical Performance Record Site Name and Location ___________________________________ Date _______________ VHF Radio Expected Measured Pass (Y/N) Perform the following at the VHF radio Output Power Level 2.5 W, ±1 W ___________

• 1793 VHF Radio User's Manual 22 Annual Maintenance Data Sheet Parameter Measured Value (A) Standard Value (B) Acceptable Tolerance (A-B) Radio Power (At Xmtr) 2.5 W ±1.0 W Reflected Power VSWR 1.0:1 3.0:1 Frequency ±1.0 kHz Modulation 80% 65-95% Transmission Line Loss 2.2 dB/50 ft. max. 3.2 dB/5

• All Weather Inc 1793, 1793 VHF Radio User's Manual 23 7. WARRANTY Unless specified otherwise, All Weather Inc. (the Company) warrants its products to be free from defects in material and workmanship under normal use and service for one year from date of shipment, subject to the following conditions: (a) The obligation of the Company under this warranty is limited to repairing or replacing items or parts which have been returned to the Company and which upon examination are disclosed, to the Company’s sat

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