Chelton Avionics, Inc. (dba Wulfsberg Electronics), located in Prescott, Arizona, designs and manufactures the CDF-992 Direction Finder, Control Display, System-7. For more than 25 years, Chelton Avionics, Inc. has distinguished itself by providing top quality avionics products for civil, air transport, and military applications. Chelton Avionics, Inc. makes no warranty, expressed or implied, with regard to this manual, including but not limited to any implied warranties of merchantability, fitness for a particular purpose, and non-infringement. In addition, Chelton Avionics, Inc. makes no warranty with regard to the documentation or data contained herein. Chelton Avionics, Inc. is not liable in the event of incidental, special, consequential, or any other damages in connection with or arising from furnishing, performance, or use of this manual. Reproduction of this publication or any portion thereof by any means is prohibited. For further information contact Sales, Chelton Avionics, Inc., 6400 Wilkinson Drive, Prescott, Arizona, 86301. Telephone: (928) 708-1500. Information in this manual is subject to change without notice. 2001 Chelton Avionics, Inc. All rights reserved PROPRIETARY NOTICE This document contains proprietary information and such information may not be disclosed to others for any purpose, nor used for manufacturing purposes without written permission from Chelton Avionics, Inc. Page ii Publication No. 150-047992 Table of Contents
Record of Revisions Rev No. Rev Date Date Inserted By Rev No. Rev Date Date Inserted By A Publication No. 150-047992 Page iii Table of Contents
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TABLE OF CONTENTS Section Page SECTION 1 INTRODUCTION 1. Applicability... 1-1 2. General... 1-1 A. ESDS Devices... 1-2 SECTION 2 OPERATIONAL 1. General... 2-1 A. Volume Control... 2-1 B. Dimmer Control... 2-1 C. Mode Selector... 2-1 D. Frequency (FREQ) Selector... 2-2 E. 406 Mode Active/Standby Selector... 2-2 F. Power/Select Selector (PWR/SEL)... 2-2 2. Display Screens... 2-2 3. Select Channel Screen (SC)... 2-2 4. Direction Finding Screen (DF)... 2-3 5. Homing Screen (HM)...2-3 6. COSPAS / SARSAT Beacon Information Screen (BCN)... 2-4 7. Power Up/Down... 2-5 8. SC (Select Channel Mode Operations... 2-6 A. To Set Up Standard Operation... 2-6 B. Single Frequency Operation... 2-7 9. Scanning Operations... 2-8 10. DF (Direction Finder) Mode Operations... 2-9 11. HM (Homing) Mode Operations... 2-10 12. Low Signal Features... 2-11 13. 406 Mode... 2-12 14. 406 MHz Beacon Data Decode... 2-15 15. Programming Mode Operation...2.16 A. Entering Configuration Mode... 2-16 B. Knob Functions in Configuration Mode... 2-17 Publication No. 150-047992 Page v Table of Contents
LIST OF FIGURES Figure Page 1-1 Electrostatic Discharge Sensitive (ESDS) Device Labels and Symbols... 1-2 Page vi Publication No. 150-047992 Table of Contents
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1. APPLICABILITY SECTION 1 - INTRODUCTION The 400-047992 ( ) CDF-992 Direction Finder, Control Display, System-7 provides control of the Chelton 7-23-30 System-7 Integrated Direction Finder equipment. 2. GENERAL The CDF-992 provides the necessary controls to select the operating mode and frequency, and to display the received signal strength, bearing information & 406 MHz beacon digital data. The CDF-992 is a black background, full color, transflective LCD screen that incorporates NVG compatible technology. White backlighting of switch legends and LED backlighting (both NVG compatible) for the screen is provided for night-time and varying ambient light use. The backlighting system may connect to the aircraft instrument lighting bus. The front panel houses the display and two dual rotary assemblies each with integrated pushbuttons. Publication No. 150-047992 Page 1-1 CDF-992 Pilots Guide
A. ESDS Device Labels and Symbols Caution: This equipment contains electrostatic discharge sensitive (ESDS) devices. All modules containing ESDS devices are flagged or identified on schematics and assembly illustrations, and are individually identified in the parts list. All ESDS devices must be handled in accordance with procedures outlined in the "repair" section of this manual. ESDS devices include, but are not limited to, C-MOS, J-MOS, PMOS, NMOS, SOCMOS, HMOS, MOS/FET, microwave mixer diodes, some bipolar devices, and some metal film resistors. The labels and symbols shown in Figure 1 are used by Chelton to identify ESDS applications. The labels DO NOT appear on units and modules manufactured prior to the adoption of the STANDARD symbol. Identifies ESDS device is present and need for special handling exists. Figure 1-1. Electrostatic Discharge Sensitive (ESDS) Device Labels and Symbols Page 1-2 Publication No. 150-047992 CDF-992 Pilots Guide
SECTION 2 OPERATIONAL 1. GENERAL OPERATION Basic System Controls and Indicators (Select Channel Display screen shown) A. Volume Control Rotating the left inner rotary know adjusts the volume level. When volume is adjusted a volume level enunciator displays on the right-hand side of the screen. The volume enunciator automatically disappears form the screen after 5 seconds. B. Dimmer Control Rotating the left outer rotary knob adjusts the LCD backlighting level. C. Mode Selector Rotating the right outer knob controls the selection of the operating mode. There are four basic Display Screens, one for each of the operating modes and a 406 MHz COSPAS / SARSAT Beacon Data Information page: Select Channel Screen (SC) DF Screen (DF) Homing Screen (HM) Beacon Data Screen (BCN) Publication No. 150-047992 Page 2-1 Section 2 CDF-992 Pilots Guide
D. Frequency (FREQ) Selector Rotating the right inner rotary knob selects the operating frequency (Channel). E. 406 Mode Active/Standby Selector ( ) Pressing the right push button activates 406 mode when in the SC Mode screen and toggles between the VHF and 406.025 frequencies when in the DF and HM Mode screens if in 406 Mode. F. Power/Select Selector (PWR/SEL) In all mode screens, pressing the left push button and holding initiates the system power down counter and screen. Momentary press of SEL is also used to recall the last bearing when signal is lost. 2. DISPLAY SCREENS There are four basic display screens, one for each of the operating modes and a 406 MHz Beacon Data Information page: Select Channel Screen (SC) DF Screen (DF) Homing Screen (HM) Beacon Data Screen (BCN) 3. SELECT CHANNEL SCREEN (SC) 1) This screen is used for set-up, channel selection, and to view channel occupancy. 2) In this mode the DF unit will not take bearing, hence the Comms audio will be undistorted by the bearing taking process. Page 2-2 Publication No. 150-047992 Section 2 CDF-992 Pilots Guide
Note: On power up, the controller reads the channel frequencies form the 7-23-30 DF, hence the channel frequencies used in this document may be different in actual systems. The format of the 6 VHF and 2 UHF channels will be maintained. 4. DIRECTION FINDING SCREEN (DF) 0 +29-90 +90 180 AGE 00 121.500 SC DF HM BCN 1) This screen is used to display the bearing (relative to the platform) of the selected channel. 2) An option (called 406 mode) is available where it is possible to conveniently toggle the bearing display between 406-.025 MHz and any one other selected VHF channel. 5. HOMING SCREEN (HM) 1) This screen performs identically to the DF screen, but displays the information in a leftright direction-to-beacon format. The relative bearing is also shown numerically. 2) In this mode, the display is arranged such that a relative bearing of approximately 45º (- 45º) degrees will place the marker at the right (left) edge of the display. Publication No. 150-047992 Page 2-3 Section 2 CDF-992 Pilots Guide
3) For relative bearings greater that 45 degrees in either direction, the arrow at the respective end of the display is illuminated. 6. COSPAS / SARSAT BEACON INFORMATION SCREEN (BCN) 1) This screen displays the information associated with the 406.025 MHz SPAS / SARSAT beacon last received since system switch-on. 2) The age figure (green FF in lower right screen) represents the time (in hex seconds) since this signal was decoded, to allow users to asses its validity. Page 2-4 Publication No. 150-047992 Section 2 CDF-992 Pilots Guide
7. POWER UP/DOWN A. POWER UP 1) Apply aircraft power: 28 V DC Note: The unit may power up immediately without any further user action. 2) If the unit appears off, momentarily press the PWR pushbutton. 3) Observe display initially shows the Chelton Splash Screen. 4) After approximately 5 seconds observe that the display changes to the SELECT CHANNEL (SC) screen display. B. Power Down 1) From any Mode/Screen, press and hold the PWR pushbutton Note: It is safe to simply remove 28 V DC Power without shutting the system down. 2) After approximately one second the screen will show a shutdown countdown timer. 3) Continue to hold the PWR pushbutton until unit switches off. Note: If the user releases the PWR pushbutton before shutdown timer expires, the unit will return to the previous Mode/Screen. 4) Remove aircraft 28 V DC power. Attention System Shutdown 3 Publication No. 150-047992 Page 2-5 Section 2 CDF-992 Pilots Guide
8. SC (SELECT CHANNEL) MODE OPERATIONS A. To Set Up Standard Operation: 1) Place the unit in SC Mode using the Mode Selector (Right Outer Knob) 2) Rotate the FREQ Selector (Right Inner Knob) to move the arrow cursor through any of the single channels (from MAIN or AUX listings), 4 Channel Scanning (SCAN MAIN), or 8 Channel Scanning (SCAN ALL). 3) The current selection is shown by the applicable frequency (or MAIN or AUX ) being indicated by an arrow, and colored green. Arrow Cursor MAIN 121.500 AUX 123.100 156.800 156.000 243.000 245.100 406.025 399.975 SCAN MAIN ALL SC DF HM BCN Scan MAIN and Scan ALL labels 4) The operation of the FREQ control switch is by rotation in either direction. Each clockwise click indent of the switch sequentially selects the frequency channels from the top of the MAIN and AUX frequency lists. 5) After the last of the AUX frequency channels has been selected the next click indent position of the switch will select SCAN MAIN, thus selecting the 4 MAIN channels and the next click indent position selects SCAN ALL thereby additionally selecting the 4 AUX frequencies, totaling 8 scanning channels in all. Note: When in the SCAN MAIN or SCAN ALL modes, the MAIN or ALL labels respectively are cursored when scanning is selected. In additional an arrow cursor is placed to the left of the frequencies selected at the time. Page 2-6 Publication No. 150-047992 Section 2 CDF-992 Pilots Guide
B. Single Frequency Operation: 1) Select the desired channel by rotation of the FREQ control switch as above. 2) If the selected channel contains an active signal, the frequency display will become highlighted and the signal strength will be shown on the vertical bar graph on the left side of the display. Squelch Level MAIN 121.500 AUX 123.100 156.800 156.000 243.000 245.100 406.025 399.975 SCAN MAIN ALL Frequency with active SC DF HM BCN signal Signal Level Bar Graph Publication No. 150-047992 Page 2-7 Section 2 CDF-992 Pilots Guide
9. SCANNING OPERATIONS 1) Select scanning option (MAIN or ALL) as required using the FREQ control switch. 2) Observe that a cursor arrows are indicting the frequencies selected (and that these are now green) 3) When any of the selected frequencies receives a signal the frequency readout in the display will be highlighted. 4) In scanning mode the signal strength is not shown on the SIG-LEVEL display. 4 Main Freqencies Selected MAIN AUX 121.500 123.100 156.800 156.000 243.000 245.100 406.025 399.975 SCAN MAIN ALL SC DF HM BCN Frequency with active signal Main Scanning Selected Page 2-8 Publication No. 150-047992 Section 2 CDF-992 Pilots Guide
10. DF (DIRECTION FINDER) MODE OPERATIONS 1) From the SC Mode Turn FREQ selector switch to the desired active frequency. 2) Turn MODE selector switch to the DF position. 3) Observe that the display changes to the DF screen. 4) It is also possible to select the DF screen, and then rotate the FREQ selector to the desired frequency. Representative Digital Compass Rose Relative Bearing in Degrees 0 +29-90 +90 180 AGE 00 121.500 SC DF HM BCN Radial Relative Bearing Indicator Age of bearing in Seconds (Loss of Signal Bearing memory feature active) Active Frequency 5) If the signal level on the active channel falls below the threshold, the displayed bearing will disappear. If it is then desired to show what the last known bearing for the channel was, press and release SEL (SELECT). 6) Observe that the previous bearing is displayed and that the time since last signal present is displayed as AGE. 7) After a period of approximately 5 seconds, the display will revert to live bearing information (i.e. will show the bearing of any received signal above threshold, or will blank if there is no such signal). Publication No. 150-047992 Page 2-9 Section 2 CDF-992 Pilots Guide
11. HM (HOMING) MODE OPERATIONS 1) Turn MODE selector switch to the HM position. 2) Observe that the display changes to the Homing screen. Marker Central Right/Left Indicator Relative Bearing +29 AGE 00 121.500 SC DF HM BCN Age of bearing in Seconds (Loss of Signal Bearing memory feature active) Active Frequency 3) If the signal level on the active channel falls below the threshold, the displayed bearing will disappear. If it is the desired to show what the last known bearing for the channel was, press and release SEL (SELECT) 4) Observe that the pervious bearing is displayed and that the time since last signal present is displayed as AGE. 5) After a period of approximately 5 seconds, the display will revert to live bearing information (i.e. will show the bearing of any received signal above threshold, or will blank if there is no such signal). Page 2-10 Publication No. 150-047992 Section 2 CDF-992 Pilots Guide
12. LOW SINGAL FREATURES The CDF-992 provides the ability to operate in areas where the signal level is below that normally detectable with audio from the receiver. This functionality is active ONLY when the DF SCREEN or the HOMING SCREEN is in view. If either of these screens is active, this feature is selected automatically, and the indication of a signal present will occur for signals that are below the noise-floor of the receiver. When a signal is shown to be present (by the highlighting of the frequency in the bottom right corner of the display), the operator is able to establish that the DF is operating using the lowsignal feature by observing that the displayed signal is below the detection threshold on the Sig Level bar-graph (on the left of the screen). Once the signal strength improves to be above the normal detection threshold, the squelch will break, and the DF will automatically swap into normal operational mode. The Low Signal Feature is used to detect (and DF) signals if the frequency is known. Under this condition, the DF SCREEN or the HOMING SCREEN should be selected along with the chosen frequency. Using the Low-Signal Feature, signal detection and bearings are provided once the CDF-992 determines signals are originating from a common relative-bearing over a period of time. Accordingly, functionality of this mode is assisted if the aircraft heading is maintained relatively constant. Publication No. 150-047992 Page 2-11 Section 2 CDF-992 Pilots Guide
13. 406 MODE CDF-992 DIRECTION FINDER, CONTROL DISPLAY, SYSTEM-7 This mode allows the user to quickly toggle a DF or HM display between the 406 COSPAS / SARSAT bearing or any one VHF channel. 1) Turn MODE selector switch to SC if not already in this position. 2) Turn FREQ selector switch until the 406.025 MHz frequency is selected as a signal frequency selections. 3) Press and release RIGHT push button (Active / Standby). 4) Observe that the frequency 243.000 MHz is selected in addition to the 406.025 MHz frequency. 5) If an alternative secondary frequency is required, turn the FREQ selector switch to the required frequency. N.B. Only VHF frequencies can be selected; i.e. any frequency other than 399.975 MHz in displayed example. MAIN 121.500 AUX 123.100 156.800 156.000 243.000 245.100 406.025 399.975 SCAN MAIN ALL SC DF HM BCN Default Secondary Frequency 6) After completion of the 406 mode set-up, select either DF or Homing mode of operation. Page 2-12 Publication No. 150-047992 Section 2 CDF-992 Pilots Guide
If the 406 Mode operation has been selected from the SC Mode Screen as described above: Observe that 406.025 MHz and the chosen Secondary frequency are displayed on the top and bottom right-hand side of the DF Mode screen. The bottom right-hand frequency is within an outline box and colored green, which signifies that this frequency has been selected for DF display. When either frequency is highlighted, it is actively receiving a signal. The Signal Level bar graph will depict the level of signal being received on the Active Frequency (Bottom, green) and should be at a level above the Squelch level marker for Audio to be heard from the DF System. To toggle between the 406.025 MHz and the Secondary frequency: Press the Active/Standby push button key (right push button). The indicated frequencies will swap between the Top Right and Bottom Right locations on the screen. Squelch Level 0 +29-90 +90 180 406.025 AGE 00 121.500 SC DF HM BCN Standby Frequency Active Frequency Publication No. 150-047992 Page 2-13 Section 2 CDF-992 Pilots Guide
The 406 mode action is the same when the Homing Screen (HM) is used. Squelch Level 406.025 +29 AGE 00 121.500 SC DF HM BCN Standby Frequency Active Frequency To Exit 406 Mode: 1) Select the Channel Select (SC) screen, and press the Active/Standby button (right pushbutton). 2) Observe that the screen now shows only the last VHF channel selected as marked. 3) Rotation of the FREQ selector operates as usual for the VHF. Page 2-14 Publication No. 150-047992 Section 2 CDF-992 Pilots Guide
14. 406 MHz BEACON DATA DECODE 1) Digital information from an active 406 beacon can be shown on the screen by switching to the BCN Mode screen. DISTRESS LONG COUNTRY 316 CAN PLB CS TA NO 109 SERIAL NO 1696 LAT N 52:00:00 LONG W 001:00:00 278E3684043566CE6 FF SC DF HM BCN Age of bearing in Seconds 2) Information displayed Country code Beacon Identification code Lat & Long data- Age in seconds. N.B. Not all beacons have Lat/Long data transmitted; hence this may not be displayed. 3) If no Beacon has been decoded since switch-on, the screen will state this. 4) This is an information only screen, with no user actions. Publication No. 150-047992 Page 2-15 Section 2 CDF-992 Pilots Guide
15. PROGRAMMING MODE OPERATION The CDF-992 Programming Operation allows configuration of the Auxiliary Frequencies, Auxiliary Frequency Squelch Levels, and Main Frequency Squelch Levels. Main Frequencies cannot be changed for safety. This mode should ONLY BE USED BY AUTHORISED USERS as configuration changes can cause incorrect operation. Entry into this mode is accordingly made fully separate to the main operational program. A. Entering Configuration Mode 1) Upon power up, the controller displays a splash screen. WHILE THE SPLASH SCREEN IS PRESENT, if both push-buttons are then depressed and held for 5 continuous seconds the system will enter the program mode. This will be indicated by the left screen shown below: 2) The configuration function consists of three screens, AUX FREQ, MAIN FREQ and EXIT. 3) The initial item selected on the AUX FREQ screen is the channel C4 Frequency. If it is desired to edit this, the left-inner (value after decimal point) and left-outer (value before decimal point) rotary knobs should be used. 4) If it is not desired to edit this frequency, the right inner knob moves this selection to the squelch value for the same channel, then the next frequency etc. 5) Sequential use of the knobs enables editing of all values on this screen. 6) After the squelch value of Channel C7, further rotation of the right inner knob will move election to SAVE. 7) Whilst SAVE is highlighted, pressing the Right-hand push button will cause all modifications made (which will all be highlighted prior to save), to be saved to the DF. 8) It is also possible to effect a save of an individual parameter by pressing the Right Hand push button after changing the parameter. If this is done, the changed parameter is immediately sent to the DF. NOTE: Changes to the DF are NOT made until either of the saving methods is auctioned. 9) If the Right outer knob is rotated clockwise, the selected screen changes to Main Freq (where the squelch levels in the main channels may be edited in a similar manner), and on further rotation the screen changes to Exit. Page 2-16 Publication No. 150-047992 Section 2 CDF-992 Pilots Guide
10) In the Exit screen self-explanatory instructions are given that enable the user to save all is changes or abandon them before exiting. The examples shown below indicate (respectively) the Exit screen, the Exit screen if the Right push button is pressed, and the Exit screen if the Left push button is pressed. B. Knob Functions in Configuration Mode Publication No. 150-047992 Page 2-17 Section 2 CDF-992 Pilots Guide