Installation Manual Part 2

FCC ill: CDG-ARTU
MAGNASTAR
EXHffiIT C
C-2000 DIGITAL AIRBORNE TELEPHONE SYSTEM
6.3.12 RECEIVE SIGNAL STRENGTH MEASUREMENT
This step will use the ARTU to measure the Receive Signal Strength (RSS) of the C-2000 system
in an RF loop-around configuration using the MagnaStar Loop-Around Test Set. This test will
verify the performance of the aircraft RF interface between the ARTU and the Antenna.
In this test, the ARTU will transmit a OAM signal at frequency of 894.9495 MHz. This signal will
be frequency translated (i.e. mixed) by 45 MHz to a frequency of 849.9495 MHz and transmitted
back to the ARTU via the MagnaStar Loop-Around Test Set. Both the TSC and Pilot receivers
are tuned to the receive frequency. The installer is to the view the RSS value of the loop-around
signal to verify the RF signal path of the C-2000 system.
The following steps are to be used with the MagnaStar Loop-Around Test Set.
Type "C" to begin the Receive Signal Strength test step. The MMT display screen
should be as shown in Figure 6-13.
Turn "ON" the Loop-Around Test Set.
Measure that the MagnaStar Loop-Around Test Set battery voltage is greater than
6.0 volts DC by pressing the battery check switch. If the Battery check LED
illuminated, then the battery is within tolerance. Otherwise replace the battery.
Carefully place the clip-on antenna test fixture (at one end of the MagnaStar Loop-
Around Test Set cable) onto the center of the MagnaStar antenna. Centerng of the
clip-on antenna onto the aircraft antenna is necessary for best results.
Set the attenuator on the Test Set for 30 dB attenuation. (Attenuation switched
"On".)
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: :laU200 8'r DaASTU C-2000 :EU~nC8 I
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: Tbe HagnaStar loop aroaDd t..t box i. to be CODDeCted to the aircraft I
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: 0 C-.ct the HagnaStar loop arouD4 t.at box to the aircraft ant_. :
: 0 s.t po.er aDd atteauator .-itch to the "OR- PO8iti~. :
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: 8ot.: pr...iDg 'C.~tiDU. - will cau.. the radio to begin t~ttiDg. :
: (C)~tiDU.. (T)roubl..boot. (K)epeat. (Q)uitl - I
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Figure 6-13. MMT Installer display screen #13.
6-14
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