Page 3-10 Installation Instructions TQG191-IM
Rev 0: 28 Feb 2019
3.3.3 P1 Connector Assembly
Use only MIL-Spec 22759/34 (Spec 55) 20AWG / 22AWG wire or equivalent for connection to
the P1, 15-pin D-sub connector.
• Crimp pins are always preferred over soldered connectors.
• Required Conductor Cross-Section:
Power Supply (Power & Ground):
AWG20 (0.62 mm
2
) < 9.88 Ω/MFT
AWG22 (0.38 mm
2
) < 16.2 Ω/MFT
• On completion of the assembly, check the continuity of all wires. Figure 3-4 illustrates
the completed P1 harness.
Figure 3-4: Cable Harness Assembly
3.3.4 Mutual Suppression
Other equipment
on board
(e.g.
DME)
may transmit in the same frequency band as the
transponder. If such a device is installed a single wire bus (Suppression = active at +12V) shall
be installed in order to protect the receiving parts of the different devices from in-band
transmissions. Mutual suppression is a pulse that is sent to the other equipment to suppress
transmission of a competing transmitter for the duration of the pulse train transmission. The
transponder transmission may be suppressed by an external source and vice versa.
• To activate mutual suppression the SUPP_I/O (pin-12) requires a +12V source from
the other equipment.
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