Furuno CSH-23F/24F - Manuals

iv FUNCTION KEYS Programming the Function Keys ........................................................................................... 6-1Replaying a Function Key ..................................................................................................... 6-1Function Key Fine Tuning ......

vii FOREWORD A Word to CSH-23F/24F Owners Congratulations on your choice of the FURUNO CSH-23F/24F Color Scanning Sonar. Weare confident you will see why the FURUNO name has become synonymous with qualityand reliability. For over 40 years FURUNO Electric Company has enjoyed an enviable reputation fo...

viii System Configuration STANDARD OPTION REMOTE CONTROL BOX CSH-116 DISPLAY UNIT CSH-230F(CSH-23F) CSH-2400F(CSH-24F) REMOTE DISPLAY* CSH-106 SUB DISPLAY* CSH-236 STEP-DOWN TRANSFORMER PT-400 INTERFACE UNIT CS-120A VI-1100A INTERFACE UNIT FNZ JOINT BOX CS-170 TRANSMITTER UNIT CSH-310 RECEIVER UNIT ...

1-1 CONTROL DESCRIPTION Control Layout on Display Unit and RemoteControl Box SUB PANEL 2 POWER TRANSDUCER OFF ON F1 F2 F3 - + NORM E/S HIST RECALL MEMO TARGET SLICE SHOOT R/B - + - + RANGE GAIN AUTO TILT WIDTH TILT SCAN DEPTH DIM CONT BRILL AUDIO NET COURSE TARGET LOCK EVENT1 EVENT2 ESTI- MATE1 ESTI...

1-2 Main Panel POWER TRANSDUCER OFF ON F1 F2 F3 - + NORM E/S HIST RECALL MEMO TARGET SLICE SHOOT R/B - + - + RANGE GAIN AUTO TILT WIDTH TILT SCAN DEPTH DIM CONT BRILL AUDIO NET COURSE TARGET LOCK EVENT1 EVENT2 ESTI- MATE1 ESTI- MATE2 FISH OFF- CENT VERTSCAN Figure 1-2 Main panel Main panel control d...

1-4 Sub Panel 1 RECALL MEMO HIST E/S NORM F4 F5 F3 F2 F1 ON OFF POWER TRANSDUCER CARD REPLAY COLOR NET REPLAY TX HELP END MENU Figure 1-3 Sub panel 1 Sub panel 1 control description Control Function MENU Opens/closes the menu. END • When the menu is displayed it terminates menu operation and returns...

1-5 Sub Panel 2 (data setting window) SIGNAL DELETE MK TVG•TX ES SONR•BEAM AUTO ALM•AUDIO NEAR 7 MEDIUM 8 FAR 9 CYCLE 7 PL 8 OUTPUT 9 TVG TX + + + + + + – – – – – – h g OPERP-SET (TOGGLE) Setting change keysChange control setting. Item selection keysSelect item. OPER P-SET keyOpens/closes data setti...

1-8 Remote Control Box 1 2 3 DISP SELECT DATA EVENT TGT LOCK ESTIMATE 1 NET COURSE FISH OFF- CENT TX 1 2 3 4 FUNCTION 5 – + RANGE + – GAIN SHOOT MEMO TGTSLICE RECALL AUTO AUTO VERTSCAN TILT TRAIN SCAN DEPTH Each press displays water temperature or depth at screen center for about five seconds. Turns...

2-1 OPERATIONAL OVERVIEW Turning the Power On/Off Turning the power on Press the ON switch on the main panel. The lamp above theswitch should light. If it doesn’t press the TX switch on subpanel 1. Turning the power off Retract the transducer with the c switch and then press the OFF key on the main ...

2-2 Selecting a Display Mode The CSH-23F/24F provides three display modes: normal sonarpicture, echo sounder (E/S) combination, and history displaycombination. Those modes may be selected with the NORM, E/S and HIST keys. Table 2-1 Display mode description Mode Description The sonar picture appears ...

2-3 Selecting a Display Range Operate the RANGE control to select a display range. The rangeselected appears at the top center of the screen. Setting the Tilt Angle The tilt angle shows the direction to which the sound wave isemitted. When the sound wave is emitted horizontally, the tiltangle is sai...

2-4 How to discriminate fish echoes from the seabed The figure below illustrates how two fish schools a and b are displayed on the screen using three different tilt angles. Case 1: Tilt angle 30 to 40 degrees. Fish school is obscured bythe seabed. Case 2: Tilt angle 10 to 20 degrees. Fish school is ...

2-5 Tilt angle for surface fish Sound emitted from the sonar transducer forms a circle-shapedbeam with a width of approximately 12 degrees in the verticaldirection (vertical beam width). The tilt angle is indicated by theangle between the center line of the beam and the horizontalplane. Then, if the...

2-6 Suitable tilt angle The figure below illustrates the relationship among tilt angle,depth and detection range. Refer to it to find out the suitable tiltangle for a given depth/detection range. 100 (200) 200 (400) 300 (600) 400 (800) Range (m) 0° 5° 10° 15° 20(40) 40(80) 60(120) 80(160) 100(200) 2...

2-7 Adjusting the Gain The GAIN control adjusts receiver sensitivity (gain). Adjust itso fish echoes are clearly displayed with minimal noise on thescreen. Too high a setting not only displays excess noise andmakes it difficult to discriminate wanted echoes but also causesseabed echoes to be painted...

3-1 FINE TUNING THE PICTURE Eliminating Unwanted Feeble Echoes Echoes from targets such as seabed and fish return to the trans-ducer in order of distance to them, and when we compare theirintensities at the transducer face, those from nearer targets aregenerally stronger when their reflecting proper...

3-3 Suppressing Seabed Tail AGC (data setting window: SIGNAL, SIGNALPROCESS) The AGC functions to automatically reduce the receiver gainonly against strong echoes such as the seabed or a large fishschool. Since weak echoes remain unaffected, a small fish schoolbecomes easier to detect. Adjust it so ...

3-4 Suppressing Seabed and Sea Surface Reflections inShallow Waters Data setting window: TVG•TX, OUTPUT In shallow fishing grounds with hard or rocky bottom, seabedreflections often interfere with wanted fish echoes and they cannot be eliminated sufficiently with the aforementioned TVG andAGC contro...

3-5 1. Turn off the TX switch and operate all on-board equipment one by one while observing the picture. 2. Run the boat at various speeds to check if the noise is speed dependent. If neither of the above two steps has effect on the picture, adjustone of the following: Interference rejector (data se...

3-6 Setting F-shift (data setting window: SONR•BEAM,SONAR) If interference cannot be suppressed by the interference rejector(IR) or Tx cycle, change the setting of F-SHFT from 1 to 2. Noise limiter (data setting window: SIGNAL, SIGNALPROCESS) Weak, unwanted reflections, colored light-blue or green, ...

4-1 MARKS AND DATA Marks, Data and Display Mode Normal display mode Figure 4-1 Marks and data appearing in the normal displaymode

4-2 Figure 4-2 Marks and data appearing in the normal displaymode w/text Figure 4-3 Marks and data appearing in the echo soundercombination display mode Normal display mode w/text Echo sounder combinationdisplay

4-3 Figure 4-4 Marks and data appearing in the history displaymode Permanently Displayed Marks and Data Range Data R Shows the range scale set with the RANGE control. Tilt Angle Data T ° Mark/Data Description The tilt angle appears below the range. The tilt angle can be changedin 1 ° steps within th...

4-4 Mark/Data Description Shows own ship’s present position. The direction of the arrow showsship’s heading. This mark moves with ship’s movement in the * truemotion mode. On all other modes it is fixed at the screen center. Own Ship’s Mark When the CSH-23F/24F is connected to a gyrocompass the mark...

4-6 *Ship’s Track Mark With gyrocompass or speed log connection, own ship’s track is plotted by a solid line. When the length of the line exceeds five times therange the oldest part of the track is erased. Nav Data S : .C :D : T : . Own Ship Data ° . N ° . E With appropriate sensors speed (S), cours...

4-7 Mark Description Target Lock Mark The target lock mark automatically tracks the fish school selectedby the operator. This function requires speed and gyrocompass inputs. Net Shooting Mark Net Shooting Data Press the SHOOT key at the instant you shoot the net to display thenet shooting mark on th...

5-1 MENU OVERVIEW Many functions are carried out through the menu system, whichconsists of the USER, SYSTEM, DATA SET and INITIAL SET/DATA menus. The menu you will use most often is the USERmenu. Menu How to open USER SYSTEM DATA SET INIT SET/TEST Press MENU. Press and MENU together. Press and MENU ...

5-2 2. Operate the arrow keys in sub panel 1 to select a menu. As you move through the menu, each item, initially shown asblue on gray, reverses to gray on blue to show selection. Forexample, select the HIST DSP/GRPH menu. 3. Press the MENU key to display menu selected. USER MENU Select item with dc...

5-3 USER Menu Description Table 5-1 User menu description u n e M m e t I u n e M n o i t p i r c s e D D R A C Y T I L I T U t s i L . d r a c y r o m e m f o s t n e t n o c s t s i L e v a S . d r a c y r o m e m o t s g n i t t e s u n e m d n a l o r t n o c s e v a S e t e l e D . d r a c y r ...

5-5 SYSTEM Menu Description The SYSTEM menu can be displayed by pressing MENU and c together. For help, press the HELP key. u n e M m e t I n o i t p i r c s e D L A N G I S S S E C O R P g n R o h c E h t o o m S e g n a r n i l e v e l g n i h t o o m s o h c e s t c e l e S r e h g i h e h t , r ...

5-8 DATA SET Menu Description The DATA SET menu can be displayed by pressing MENU + d . For help, press the HELP key. u n e M u n e M u n e M u n e M u n e M m e t I m e t I m e t I m e t I m e t I n o i t p i r c s e D n o i t p i r c s e D n o i t p i r c s e D n o i t p i r c s e D n o i t p i r ...

5-11 INIT SET/TEST Menu Description The INIT SET/TEST menu can be displayed by pressing MENUand ON together. u n e M m e t I n o i t p i r c s e D J D A G N I D A E H t s u j d A g n i d a e H l l u h n o k r a m D A E H f o e l g n a n o i t a i v e d s t e S 5 1 s i n o i t a i v e d f I . w o b s...

6-1 FUNCTION KEYS Similar to the quick dialing function on a telephone, the fivefunction keys (F1–F3) on the main panel record control and menusettings and replay them back exactly as programmed. The itemsyou can program are gain, display mode, TX ON/OFF, USERmenu, SYSTEM menu, DATA SET menus and da...

6-2 FUNCTION KEY REGISTER 1 USER MENU Customized settings are registered to FUNCTION keys. Select key number with ↑ ↓ key and press MENU key. Press END key to return to sub menu. Figure 6-2 REGISTER menu 5. Press the up or down arrow key in the sub panel 1 to select the function key to program, then...

6-3 Function Key Fine Tuning Fine Adjustment Item -4 -3 -2 -1 0 1 2 3 4 5 TVG Near -3 -2 -1 0 0 1 1 2 3 4 TVG Mid -3 -2 -1 0 0 0 1 1 2 3 TVG Far -3 -2 -1 0 0 0 0 1 1 2 Tx Cycle 0 0 0 0 0 0 0 0 0 0 Tx Beamwidth -3 -2 -1 0 0 0 0 0 0 0 Tx Power -2 -1 0 0 0 0 0 0 0 0 Saving Function Key Settings to a Me...

7-1 ADVANCED LEVEL OPERATION Finding Fish School Center When you want to find the center depth of a fish school, usethe auto tilt function, which automatically scans the tilt anglewithin the selected width. There are two automatic scan range,WIDE and NARROW, which can be selected by the INITSET/TEST...

7-2 Tracking a Fish School (target lock) Target lock, which requires speed and heading inputs, automati-cally tracks an important fish school so that you wonít lose sightof it on the display screen. Two types of target lock are avail-able: Target Mark or Fish. One may be selected on the SYS-TEM menu...

7-3 Target lock mark appearance The size and thickness of the target lock mark indicates fish speedand tracking status, as shown below. Meaning Target lockmark appearance Mark size indicatesrelative speed. FastMediumSlow (More than 5Tx cycles)(Up to 3 Txcycles) Mark thickness showstracking status. F...

7-4 4. Select Tracking Method, and then press the [MENU] key. 5. Select method desired. 6. Press the [END] key several times to close the menu. Tracking target lock mark 1. Operate the trackball to place the trackball mark on the fish school you want to track. 2. Press the [TARGET LOCK] key to light...

7-5 Setting target lock conditions 1. Open the sub panel 1. 2. Press the [MENU] key while pressing and holding down the down arrow key in sub panel 1. 3. Select TARGET LOCK with the arrow keys. 4. Press the [MENU] key. SYSTEM MENU TARGET LOCK Tracking Method TGT Mark Fish Track Echo Color 8 Choose w...

7-6 Description of target lock items TrackingMethodSets target lock function: target lock mark, fish or automatic. Track Echo Color Sets minimum echo signal level to track. A fish school whosesignal level is above the level set here is tracked. Fish Speed Limit Sets fish speed at which target lock i...

7-7 Detecting Fish Schools Aurally Sometimes you may be preoccupied with other tasks and unableto concentrate on watching the sonar picture. In such cases itwould be a good choice to use the audio function. This functionenables you to monitor echoes from fish schools and seabedthrough the built-in s...

7-8 The Fish Alarm The fish alarm sounds an audible alarm when a fish echo abovea preset strength enters an alarm zone. You set parameters forthe fish alarm at ALM on the data setting window. ON/OFF: Turn alarm on or off.Level: Set echo strength level which will activate the alarm. Zone: Set alarm z...

7-9 Relocating Fish School for Easy Observation 1. Operate the trackball to place the trackball mark on the posi- tion where you want to relocate the own ship mark. 2. Press the OFF-CENT key. 3. To move the own ship mark back to the screen center, press the OFF-CENT key again. Own shipmark Place tra...

7-10 Comparing of Fish School Concentration You can get an estimate of the volume of two fish schools byusing the two ESTIMATE keys. 1. Operate the trackball to place the trackball mark on a fish school, and then press the ESTIMATE 1 key. The estimate mark appears on the fish school. Relative vol-um...

7-11 Measuring Fish School Speed To ensure a good haul, it is important to estimate the directionand speed of the fish school before shooting the net. You can dothis with the FISH key. If the tidal current data is used togetherwith fish speed data, you can determine the timing of the netshooting mor...

7-12 Note 3: Each time the FISH key is pressed the latest fish markand ship’s speed mark change in the sequence shown below: Fish key pressed once: Fish key pressed twice: Fish key pressed three times: Fish key pressed four times: ↓ ↓ X → ↓ X ↓ ↓ X → ↓ → The Event Mark The event mark is useful for f...

7-13 Entering an event mark 1. Set the trackball mark where you want to place an event mark (latest event mark). 2. Press an EVENT key. The horizontal range, depth and bear- ing to the event mark appear at the bottom left corner of thescreen. (35) Stored when EVENT key is pressed. A B → 234: Horizon...

7-14 True Motion Display The relative motion display places the own ship mark at the screencenter, and echoes from fish and the seabed move on the screenrelative to own ship’s movement. This means that even whenthe ship is dead in water, fish echoes move on the display. In the true motion display, h...

7-15 Plotting Net Location Mark Before shooting net, you will decide the shoot timing consider-ing the water current direction, distance to fish school and mov-ing direction of the fish school. Use the net location mark as aguide to decide the timing. This function requires speed and heading inputs....

7-16 Observing Net Behavior With net sonde connection you can observe net behavior afterthe throwing of the net, on the echo sounder combination mode.Accurate depiction of net sonde position depends on proper set-ting of the distances between net sonde transmitters. You can setthose distances on NET...

7-17 Target Slice Display Using automatic tilting, the target slice mode displays the echoinside the estimate mark at several different tilt angles (depth).To access the target slice display, press the TARGET SLICEkey. The table and illustration below describe the target slicemode. n i . o N g n i w...

8-1 VERTICAL SCANNING DISPLAY The vertical scanning display provides a wide fish eye view ofunderwater conditions from the surface to the seabed. The fig-ure below illustrates the concept of the vertical scanning mode,in comparison with the normal sonar beam. The vertical scan-ning mode helps you ke...

8-2 Display Indications Figure 8-3 Indications of vertical scanning display Application to Bonito and Tuna Fishing Tracking of bonito and tuna presents a special challenge to thesonar operator: He must try to keep them within the sonar beam,a formidable task considering their high speed and penchant...

8-3 Tracking If you are visually tracking a fish school which characteristi-cally leaps and dives regularly, or a school with a flock of birdshovering over it, the school will scatter once the vessel ap-proaches, thus you will lose sight of the school. The CSH-23F/24F provides continuous pictures of...

8-4 Catching While the sonar operator monitors the sonar for other fish schools,the crew can scatter bait and water to attract fish to the boat. Figure 8-6 Catching

9-1 PORT/STARBOARD, HORIZONTAL SLICE DISPLAYS The port/starboard display or horizontal slice display may bedisplayed by pressing the [HIST] key. The display shown de-pends on the setting of “HIST DSP/GRPH” in the USER menu. Port/Starboard display The port/starboard display takes echoes along the bea...

9-2 Horizontal slice display 120 degrees of the picture in the horizontal direction is shownfor a given depth (D) in the horizontal slice window at the bot-tom of the display. The area to display may be selected with the[R/B] key. Range Mark Horizontal Slice Width D Bearing Mark Range Mark Color Bar...

10-1 MEMORY CARD OPERATIONS Initializing Memory Cards Before you save information to a memory card it must be initial-ized (formatted). 1. Press the MENU key to display the USER menu. 2. Select the CARD UTILITY menu. 3. Select Initialize. It takes more than two minutes to initialize a memory card. 4...

10-2 Saving the Picture You can save either the whole screen or the echo inside the esti-mate mark to the internal memory or a memory card. e v a S o t a t a D e v a S o t a t a D e v a S o t a t a D e v a S o t a t a D e v a S o t a t a D d o h t e M g n i v a S d o h t e M g n i v a S d o h t e M ...

10-3 Saving Net Shooting Data How net shooting data is saved The unit starts accumulating net shooting data when the SHOOTkey is pressed. When net shooting is concluded by pressing theSHOOT key again, the echo inside the estimate mark and othernet shooting data are saved to the internal memory. Note...

10-4 Replaying Saved Data Whole picture or echo inside estimate mark 1. Press the RECALL key (on the main panel). 2. Press the right or left arrow key in sub panel 1 to select item to replay. The left arrow key selects older data (for example,data in memory card); the right arrow key newer (for ex-a...

11-1 TURNING MARKS, DATA ON/OFF You can turn marks and data on or off through the data settingwindow or the USER menu. Turning marks on/off through the data settingwindow Select DELETE MK to delete the following marks: Event Mark 1 Event Mark 2 Fish Mark Own Ship Mark Ship's Track Each press of + or...

12-1 INTERPRETING THE DISPLAY Seabed Echoes When the tilt angle is widened, the seabed echo illustrated be-low will appear on the display. When the tilt is narrowed, theseabed trace becomes wider and weaker. By observing the sea-bed condition on the display, the skipper can prevent net dam-age. (A) ...

12-2 Fish Schools A fish school appears as a mass of echoes on the screen. Thecolor of the mass shows the density of fish schools on the sonarbeam. To find distribution and center point of a fish school, tryseveral different tilt angles. (A) Sea surface fish Tilt angle: -5 ° to 10 ° (B) Midwater, bo...

12-3 Sea Surface Reflections To reduce sea surface reflections, set the tilt angle to 5 ° or higher, so the upper edge of the sonar beam does not hit the sea surface,or adjust TVG. When a narrow tilt angle is used, sea surfacereflections cover a large area as illustrated below. Sea surface Sea surfa...

12-4 False Echo by Sidelobe An ultrasonic wave is emitted only in the direction set by theTILT lever, however there are some emissions outside the mainbeam. These are called sidelobes. The energy of the sidelobe isfairly weak but when the water is comparatively shallow and thebottom is rocky and har...

13-1 WARNINGS Overvoltage Warning If the input voltage to this unit rises above 125 VAC, the over-voltage detection circuit activates, an alarm sounds and the mes-sage OVERVOLTAGE appears at the screen center. If this occurs, retract the transducer, turn the power off and checkthe ship’s mains volta...

13-2 Reset Button Main Shaft Hull Unit Hand Crank Raise/Lower Control Box Breaker Figure 13-1 How to manually raise the transducer

14-1 SELF TESTS The CSH-23F/24F has various self tests to check it for properoperation. If a test reveals equipment malfunction do not attemptto check inside the equipment. There are no user serviceableparts inside the equipment. Do not open the cover. There are no user-serviceableparts inside. Refe...

14-2 Self Test Description Single test The ROM, RAM and other devices of the displayunit are checked once. Control is returned to theSELF TEST menu when the test is completed. Continuous test The devices of the display unit are checked con-tinuously. START UP TEST DCON DRAW DUAL ES SLICE PSIO PIF 10...

14-3 Panel test This test checks the keys of the main and sub pan-els and the remote control box. Press and releaseeach key. Its on-screen location should display “1”when the key is pressed and “0” when released. Toescape from the test reset the power. Color test This test checks for proper display ...

14-4 Gray test This test checks for screen distortion. To escape fromthe test reset the power. SIO test This test checks for proper communication betweenthe display unit and transmitter unit, and requires ajumper plug. To escape from the test reset the power. GRAY TEST , Q ¢, Q ¢ Figure 14-7 SIO tes...

14-5 Interface Unit CS-120A Self Test 1. Open the cover of the interface unit. 2. Find DIP switch DP-1 on the lone circuit board. Turn switch #6 on to start the self test. The results of the check appear onthe digital display beside the DIP switch. 3. Turn the DIP switch off after completion of the ...

15-1 INPUT DATA SELECTION Selection of Data at Interface Unit CS-120A Nav data and fish data input from external equipment can beturned on or off at DIP switch DP-1 in the Interface Unit CS-120A. Ship's speed and bearing (for track plotting, true motion, target lock, etc.) Input Device S1 S2 Select ...

15-2 Setting Distances Between Net Sonde Transmitters To accurately display the net shooting mark and net sonde markposition, the distance between transmitters must be correctly set.This is done on the DATA SET menu. R1 R0 R2 R0: Length of net from its end to transmitter1 in meters.R1: Length of net...

16-1 MAINTENANCE Do not open the cover. There are no user-serviceableparts inside. Refer any repairwork to a qualified technician. WARNING Display Unit Maintenance Keep magnets and cassette tapesaway from the display unit. Handle the equipment with care. Damage can cause corrosion. DISPLAY UNIT Clea...

16-2 Hull Unit Maintenance HULL UNIT Apply MOLYTONE grease#2 every six months. Dry dock ship and cleantransducer face yearly.Apply single coat of "MARINE STAR 20 Mod(Red-N)" anti-foulant totransducer face to keepmarine life off the transducer. Raise transducer and coat mainshaft with DAPHAEC...

A-1 MENU TREE USER Menu Event Mark 1 Event Mark 2 Fish Mark On Track Data Text Window ES Window Range/Bearing Heading Mark Range Rings Bearing Scale Auto Scan Width w/Current Vec w/Current Vec w/Current Vec Register Save Save List Save Delete Initialize ON OFF ON OFF ON OFF Depth Temp OFF ON OFF Cur...

A-2 DATA SET Menu Setting range: 200-1000 m ON OFF Setting range: 0-3000 m Setting range: 0-1000 m Execute Execute Execute Execute Execute Execute Execute CHANGE COLOR DATA SET MENU Sonar 1 Sonar 2 Echo Sounder Marks Menu Execute Execute NET SHOOT PLAN Net Diameter Tilt Interlock COLOR CURVE Sonar 1...

A-4 SYSTEM Menu 25log 30log 35log 40log FAR TVG Far TVG Curve Setting range: 0 to 3 SIGNAL PROCESS Smooth Echo - - - Rng Smooth Echo - - - Cir Delete Color Setting range: 0 to 3 Setting range: 1 to 10 SYSTEM MENU 1.3R 1.6R TM DSP TM Display Range 32 Cmps 360 ° True BRG READOUT Course Current Data Ev...

SP-1 SPECIFICATIONS Model: CSH-23F/24F- M 1 (Freq.: 24 kHz) 2 (Freq.: 28 kHz)3 (Freq.: 32 kHz) 1. GENERAL (1) Range, TX Cycle, Pulselength c i s a B e g n a R ) m ( e g n a R e l c y C X T ) c e s ( h t g n e l e s l u P ) c e s m ( " F F O " r e t n e c f f O " N O " r e t n e c f f...

SP-2 (3) Transceiver Transmitter High power MOS FET amplifier with 10-step power reduc-tion switch Receiver Low noise superheterodyne, continuously scanning beamforming, TVG, AGC, signal/processing, interference rejec-tor, horizontal vertical beam switching. (4) Beamwidth (-3 dB) and Tilt Angle TX B...

IN-1 INDEX A AGC ................................................................ 3-32AGC .............................................................. 3-3AUDIO ........................................................... 7-5 B Beamwidth ...................................................... 3-6 C C...