TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
TN910 Rev 5-0-0 May 14Page 8 of 16
© 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: 1-800-664-4066
Fax: 1-877-750-0004
International
Phone: 250-382-8268
Fax: 250-382-6139
Internet
Email: LMRsales@codanradio.com
Web: www.codanradio.com
CTCSS Decode:
To check the CTCSS decode of the receiver, plug the Audio Control Card into the subrack and ensure that the
CTCSS decode switch is turned ON (if applicable). When the decoder is turned ON, the receiver will mute and
audio will no longer be audible at the System Regulator speaker.
If the Auxiliary Balanced Output test was the last test performed, re-connect the Receiver Balanced Audio Output
to the AUDIO/DATA SINAD IN input on the IFR COM-120. Ensure the 1.0 KHz audio tone is still injected into the
receiver (with GEN1) and that the deviation level is set at ± 60% maximum deviation (±3.0 KHz wide / ±1.5 KHz
narrow).
To inject the CTCSS tone into the receiver, highlight Mod Src and select GEN2, then highlight OFF and select FM as
shown in Figure 7. Highlight Freq and enter the CTCSS decode tone, then highlight Deviation and enter a deviation
of ±0.50 KHz wide / ±0.35 KHz narrow.
Figure 7: IFR COM-120 CTCSS Test Confi guration
The receiver will now un-mute and the 1 KHz tone (and possibly the CTCSS tone) will be audible on the System
Regulator speaker. If the receiver does not un-mute, check that the correct CTCSS tone frequency is entered in
the IFR COM-120.
This product has been discontinued and is no longer manufactured by Codan Radio Communications
To Next Page
Loading...
Need help?
General