Installation
Post Installation Tests
92 Transceiver Family 620X DV14307.03 Issue 04 March 2016
2.12.5. AFCU/AGC/AFWB
Not used in aircraft installations, remove pins P1-15 and pin P1-16.
2.12.6. CPIN (if Installed)
No influence in retrofit installation, please remove coding cap from the connector hole.
2.12.7. +13.75 V Switched (AR4201) - PWR_EVAL (AR6201)
The AR6201 provides on pin P1-24 a low signal when the unit is switched on and a high impedance
signal, when switched off.
Note: This is not compatible to the AR4201, which provided a positive power supply
when switched on and high impedance when switched off.
In cases where slave equipment needs to be switched ON/OFF in sync with the AR6201 connect a
relay to pin P1-24.
2.13. Post Installation Tests
Note: It is assumed that the "Configuration Setup" (see "Configuration Setup", page 53) has
been done before the Post Installation Tests will be carried out.
Once the 620X is installed, complete a test procedure to verify system functionality. Ensure
compliance with authority required procedures. Refer to the installation order of the minor change
document or use an own approved test protocol for VHF units. The following chapter provides
guidance for such tests.
2.13.1. Mechanical Installation and Wiring Check
• Verify all cables are fixed securely and shields connected properly to signal ground.
• Check the movement of aircraft controls to verify there is no interference.
• Verify all screws are tight and the connectors on the rear side of the unit are secured.
2.13.2. Power Supply
• Check the power supply lines and confirm correct polarity.
• Confirm that the aircraft power supply is within the specified limits, with and without a
running engine.
2.13.3. Receiver / Transmitter Operation
• Power up the 620X and tune it to a local station for a communication test.
• Verify that the receiver output produces a clear and readable audio and ask the local
station for proper readability for the transmit signal of the 620X.
• Repeat this communication test with an airborne station within ≈ 20-40 NM (Nautical
Miles).
2.13.4. Antenna Check
• Check the VSWR (voltage standing wave ratio) over the complete frequency band (e.g. by
using a VHF Reflection-Coefficient Meter).
The VSWR ratio should be less than 2:1 and is not acceptable when exceeding 3:1.
2.13.5. Interference Check
• Check the 620X while engine is running and all other avionics/ electrical systems on the
aircraft are powered, to verify that no significant interference exists.
• Check also that the 620X does not cause significant interference with other systems.
The installer´s standard test procedure may be used for the interference check and the table can be
taken as a reference. Depending on the individual avionic systems installed in the aircraft, it might be
necessary to extend the following checklist accordingly.
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