Terra TN 200D, Руководство по эксплуатации и установке

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10
Revision H
August 19, 1996
2.4 INSTALLATION (CONTINUED)
CAUTION: The operating voltage of this Terra by Trimble TN 200D is
13.75 V nominal for direct connection to an aircraft 12-14 volt electrical
system. If the aircraft electrical system supply is 24-28 volt, it will be
necessary to employ a converter to reduce the 28 volts to 13.75 volts for the
Terra by Trimble TN 200D. Terra by Trimble can supply an optional
converter specifically designed for this purpose. It is Terra by Trimble P/N
0900-3219-12, Model MLC 28-5.
7. Install the TN 200D in the mounting tray assembly. Use caution as the rear
connectors mate. After the float mounts are positioned correctly (a little twisting at
the front panel may be necessary), the unit will fully engage the connectors with light
to medium pressure on the front panel.
CAUTION: DO NOT PUSH UNIT INTO TRAY WITH THUMBS
ON LENS AS DISPLAY DAMAGE MAY RESULT!
Insert a 7/64" Allen wrench in the front panel hole and engage the locking screw.
Turn clockwise until the cam has engaged itself in the tray and is moderately
tightened. Use caution to prevent stripping the threads on the locking cam or screw.
To remove the unit from the mounting tray, insert the 7/64" Allen wrench in the
locking screw and turn counterclockwise. The cam will move the unit outward about
1/4" and disengage the connectors. The unit may now be pulled out of the mounting
tray by hand.
8. The connector bracket is mounted from the front side of the sleeve with two Phillips
head screws and lock washers. As viewed from the front of the unit, pin 1 of the
connector is top right and pin 15 is bottom left.
2.5 ANTENNA INSTALLATION
A 50 ohm horizontally polarized navigational antenna is recommended. Insure tested speed of
the antenna matches top speed of the aircraft. Connect the antenna to the Terra by Trimble
TN 200D using standard 50 ohm coaxial cable such as RG 58A/U. Terminate the cable with
BNC coaxial connectors as required. Ohm out the coax to insure no shorts are present.
Select a location providing a clear line of sight and symmetrical to the centerline of the
aircraft. Insure proper bonding of the antenna to the aircraft.
2.6 OPERATIONAL CHECKOUT
1. Rotate OFF/ON/VOLUME/IDENT (left side) knob clockwise past the detent to turn
receiver on. This will also supply power to the indicator if it is connected to switched
power out.
2. Rotate TUNE (right side) knob to obtain the desired frequency in the right hand
window. Verify that the faster the knob is rotated the more the frequency changes
with each detent.
3. Press the “<—>” (TRANSFER) button and verify that the two frequencies “swap”
sides in the display.
4. Rotate the ON/OFF/VOLUME/IDENT knob clockwise and verify white noise on the
audio out. If a VOR station is within range, verify that whenever the left knob is
depressed the ident is eliminated from the audio output and with the knob pulled out all
the received audio is applied to the audio output.