Special Note to Installers:
The following important issues regarding TCAD installation should be noted during the
planning stages. See the Installation Planning Guide, Section VI for additional
information:
1. The Model 9900B installation requires the Sensor Systems bearing antenna set, which
is supplied with the 9900B. The 9900A and 9900 require L-band antennas such as the
Comant CI-105, which are not supplied. See Paragraph 1.7.
2. The design antenna cable loss is 3dB, ±0.5dB. The loss requirement between cables is
0.2dB. Plan the antenna cable lengths insure compliance with this requirement. See
Paragraph 1.9.
3. The location of the antenna is important. The antenna "view" ahead of the aircraft
must not be obstructed. See Paragraphs 2.13 and 6.2.1.
4. The Models 9900 and 9900A are upgradable to the 9900B. If installing a 9900 or
9900A, it may be in the best interest of the installer and the customer to install an
additional coaxial line from each antenna (top and bottom). This will greatly reduce
the time and expense of upgrading to the 9900B in the future.
5. Suppression between the transponder, TCAD and DME (if installed) is required. See
Paragraph 2.4.
6. Connecting TCAD audio to an audio panel without internal amplification or into a
shared audio port can affect the maximum audio level. See Section VI.
7. Interface with Multifunction Displays is covered in a separate document, 32-2304,
Model 9900B Multifunction Display Interface Installation Instructions.
8. The Annunciator circuit is a switched ground. Applying battery voltage to this input
can damage the TCAD Processor.
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