Installation Manual Part 2
EXHIBffC
C-2000 DIGITAL AIRBORNE TELEPHONE SYSTEM
FCC ill: CDG-ARTU
MAGNASTAR
6.3.16 RECEIVE SIGNAL STRENGTH MEASUREMENT USING GENSTAR GROUND
STATION
This test step will verify the ability of the MagnaStar system to properly monitor a GTE AIRFONE
GenStarTU system ground station. This step will use the ARTU to measure the Receive Signal
Strength (RSS) of the Pilot signal from the GenStarTM system ground station. This test will verify
the performance of the aircraft RF interface between the ARTU and the Antenna. (This
measurement is a relative measurement because of the possible RF link variations between the
C-2000 Antenna and the GenStarTU ground station). This test is only valid if the test location
will support an RF link with a GenStarTM system ground station.
The installer is to view the MMT Status Updates window and verify that the ARTU has acquired
and is monitoring the pilot signal from a nearby GenStarN ground station. The MMT Status
Updates window will indicate that the ARTU is monitoring a pilot signal by the presence of the
"MON" indication in the "Assignment" row. This indication will be associated with only one of the
ten possible subbands on which pilot signals may be present. If the "MON" indication is not
present, then the ARTU has not acquired the signal from a ground station. In the column below
the "MON" indication the installer will find the associated RSS value in units of demo A value
between -5OdBm and -105 dBm will allow the installer to establish normal communications with
the GenStarTM ground station. However, values less than -105 dBm may not constitute a failure.
Because the ARTU is in a normal operational mode when this test is performed. the pilot receiver
will periodically scan each of the ten different subbands searching for the best quality pilot signal
from a ground station. For this reason the reported RSS value may change to a different value
while the pilot receiver is scanning other subbands.
The MMT display screen will be similar to that shown in Figure 6-19.
V&.OA ~ ..410 a..paD8e ~
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: C-2000 ~Z't8 8tatua update 8A.~-8D
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Pr... P2 to vi- sut- Diaplay
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: %DUllS ~ D8AftU C-2000 m8'1'Al.l,A.n~ :
"(8.,~-T~Y.1 I
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: Verify ~.iY84 .igDal S~reDQth (U.) f~. 08D8~ar grcRaDII .ta~iC8. :
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:DP~-Tau USUL7S1 :
: U'fU ~r.~iJIQ iD ~~or 8)d. ~ ~ S~.~u. opcSa~.. wiDdOIf .. .~ bel~1 :
I .A8.i~~ - . :
: ."S (dBa) 11.1 1t.1 11.1 11.1 1t.1 11.1 1t.1 11.1 1t.1 11.1. :
:Acor%~SI :
: 0 Pr8.. r2 ~o yi- ~t.or .~.~U8 aboY8 ~ ~ S~.~U. opcSa~.. wiadow. :
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: 80~. t:ba~ - or ~. ..~~Dd. ~ 8hCJW u. aDd t:ba~ ,-, .ill be 8bo.D :
: .. t:ba~ 8abb8M'. ...1~~ -- . 8Uitabl. 8abb8M i. loca~e4. :
: (C)~~iDD.. (7)roubl..hoot.. (a)epeat.. (Q)ui~1 - :
+ +
Figure 6-19. MMT Installer display screen #19.
RevB
6-20