KR 87 Silver Crown ADF System

航空发表于 2010-9-26 09:30:17

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航空发表于 2010-9-26 09:30:31

27 KR 87 KI 227 KS 227-00 shown, non-slaved, standard KI 227-01 slaved, optional 323 2 31 ANT/ADF Mode Annunciation IN USE Frequency BFO Annunciation STANDBY Frequency Annunciation STANDBY Frequency, FLIGHT TIME or ELAPSED TIME Flight timer and Elapsed timer mode annunciation ON/OFF/VOL Control Switch Select ANT mode (out position) Select ADF mode (in position) Frequency Transfer Button Select FLIGHT TIMER or ELAPSED TIMER Set and Reset ELAPSED TIMER Select BFO Button Lubber Line Bearing Pointer Heading Knob “SYNC” Knob Compass Card Frequency Select Knobs KI 228 Slaved KI 228-01 shown. Standard KI 228-00 also available with manually rotatable compass card. KI 229 KNI 582 ð KR 87 Silver Crown ADF System Operating the KR 87 28 Silver Crown Plus Pilot’s Guide Turn-on Rotate the ON/OFF/VOL knob clockwise from the detented “OFF” position. The unit will be activated and will be ready to operate. Rotation of this control also adjusts audio volume. The KR 87 has “audio muting” which causes the audio output to be muted unless the receiver is locked on a valid station. Frequency Selection The active frequency (to which the ADF is tuned) is displayed in the left side of the window at all times. A standby frequency is displayed in the right side when “FRQ” is annunciated. The standby frequency is placed in “blind” memory when either FLT (Flight Time) or ET (Elapsed Time) mode is selected. With “FRQ” annunciated, the standby frequency is selected using the frequency select knobs which may be rotated either clockwise or counterclockwise. Pull the small inner knob out to tune 1’s. Push the smaller inner knob in to tune 10’s. The outer knob tunes the 100’s and the 1000’s up to 1799. The standby frequency selected may then be put into the active window by pressing the “FRQ” button. The standby and active frequencies will be exchanged (flip-flopped), the new frequency will become active, and the former active frequency will go into standby. Operating Modes Antenna (ANT) mode is selected and annunciated when the “ADF” button is in the “out” position. ANT provides improved audio reception from the station tuned and is usually used for identification. The bearing pointer in the KI 227 indicator will be deactivated and immediately turn to the 90° relative position and remain there during ANT reception. The ADF mode is selected and annunciated when the “ADF” button is in the depressed position. ADF activates the bearing pointer in the KI 227 indicator, causing it to move without hesitation to point in the direction of the station relative to the aircraft heading. The compass card on the KI 227 may be rotated as desired by using the heading knob. NOTE: The KI 227-01 or KI 228-01 indicators, when installed with a Bendix/King KCS 55A Compass System, have a slaved compass card. Magnetic heading of the aircraft will be under the lubber line. The indication of this compass card should be compared with that of the KI 525A master indicator from time to time. Check especially after steep bank turns and taxi turns. If a discrepancy between the two readings exists, the KI 227-01 or KI 228-01 compass card should be synchronized to the KI 525A compass card by rotating the “SYNC” knob on the indicator. Outside of the United States some stations are unmodulated and use an interrupted carrier for identification purposes. The BFO mode, activated and annunciated when the “BFO” button is depressed, permits the carrier wave and the associated Morse code identifier broadcast on the carrier wave to be heard. ADF Test (PRE-FLIGHT OR IN-FLIGHT) Select ANT mode. This will cause the bearing pointer to move directly to 231 39:38 323 2 31 323 2 31 29 KR 87 the parked 90° position. Make sure the unit is tuned to a usable frequency. Now select ADF mode and the needle should move without hesitation to the station bearing. Excessive sluggishness, wavering or reversals indicate a signal that is too weak or a system malfunction. Operating the Timers The flight timer will always be automatically reset to :00 whenever power is interrupted either by the avionics master switch or the unit’s ON/OFF switch. An optional external switch may be installed which, when activated, will stop or start the flight timer. This switch would be of use during a non-refueling stop when resetting the flight timer is not desired. On some aircraft it may be desirable to use the aircraft strut switch instead of a manual switch to stop and start the flight timer. It should be emphasized that the start/stop function will only operate with power applied to the unit. Always read flight time prior to power shutdown. Flight time or elapsed time are displayed and annunciated alternatively by depressing the FLT/ET button. The flight timer continues to count up until the unit is turned off or stopped with an external switch. The elapsed timer may be reset back to :00 by pressing the SET/RST button. It will then start counting up again. (NOTE: pressing the SET/RST button will reset the elapsed timer whether it is being displayed or not.) The elapsed timer also has a “count-down” mode. To enter the countdown mode, the SET/RST button is depressed for about two seconds, or until the “ET” annunciation begins to flash. It is now in the ET set mode, and a time up to 59 minutes, 59 seconds may be preset into the elapsed timer with the concentric knobs. The preset time will be displayed and remain unchanged until SET/RST is pressed again, which will start the elapsed timer counting down from the preset time. When the timer reaches :00 it will start to count up as the display flashes for 15 seconds and an aural alarm, if installed, is activated for about 1 second. NOTE: The standby frequency which is in memory while flight time or elapsed time modes are being displayed may be called back by pressing the FRQ button, then transferred to active use by pressing the FRQ button again. While FLT or ET is displayed the “in use” frequency on the left side of the window may be changed, by using the frequency select knobs, without any effect on the stored standby frequency or the other modes. This feature is especially useful when searching for stations with unknown frequencies. Erroneous ADF Bearings Due to Radio Frequency Phenomena Station Overlap In the U.S., the FCC, which assigns AM radio frequencies, occasionally will assign the same frequency to more than one station in an area. Certain conditions, such as Night Effect, may cause signals from such stations to overlap. This should be taken into consideration when using AM broadcast stations for navigation. Sunspots and atmospheric phenomena may occasionally distort reception so that signals from two stations on the same frequency will overlap. For this reason it is always wise to make positive identification of the station being tuned, by switching the function selector to ANT and listening for station call letters. 231 39 38 231 28 30 Silver Crown Plus Pilot’s Guide Electrical Storms In the vicinity of electrical storms, an ADF Indicator pointer tends to swing from the station tuned toward the electrical discharges. Location of the storm can be useful information, but the erratic behavior of the pointer should be taken into account. Night Effect This is a disturbance particularly strong just after sunset and just after dawn. An ADF indicator pointer may swing erratically at these times. If possible, tune to the most powerful station at the lowest frequency. If this is not possible, take the average of pointer oscillations to determine relative station bearing. Mountain Effect Radio waves reflecting from the surface of mountains may cause the pointer to fluctuate or show an erroneous bearing. This should be taken into account when taking bearings over mountainous terrain. Coastal Refraction Radio waves may be refracted when passing from land to sea or when moving parallel to the coastline. This should be taken into account when operating near coastal areas.

猪也能飞 发表于 2013-10-28 19:13:57

感谢楼主万分感谢感谢万分

xy8701 发表于 2015-4-7 22:52:15

谢谢楼主，我正准备去RMIT读书

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KR 87 Silver Crown ADF System