TN910 Rev 5-0-0 May 14
TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
Page 15 of 16
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Distortion:
Complete radio system audio distortion is typically less than 5.0 %. If the radio system distortion is greater than
5.0%, the transmitter or receiver may need re-tuning. Refer to the Instruction Manual or Technical Note for tuning
procedures.
Repeater Deviation Levels:
Ensure the deviation into the receiver is set at ± 60% maximum deviation (±3.0 KHz wide / ±1.5 KHz narrow). The
transmitter deviation into the IFR COM-120 should read within ± 0.15 KHz of the input deviation.
AC-3E Audio Control Cards:
If transmitter deviation is off by more than ± 0.15 KHz deviation from the input deviation of ± 60%, adjust the audio
level matching pot on the front panel (RXA to TXA, RXA to TXB, RXB to TXA or RXB to TXB) of the Audio Control
Card until the deviation levels match.
AC-3L-96 Audio Control Cards:
If transmitter deviation is off by more than ± 0.15 KHz deviation from the input deviation of ± 60%, check the receiver
audio level and transmitter deviation level individually in the Rx and Tx modules.
This product has been discontinued and is no longer manufactured by Codan Radio Communications
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