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Chapter 6, Problem Solving

If your radio fails CTCSS/CDCSS tests or the tests don’t run

❒ Check the test parameters for setting CTCSS/CDCSS squelch to be sure they are

correctly set up. Incorrect settings for any one of these test parameters will affect how

the test runs.

1. Parameter 8, RX CT/CDCSS Available lets the test set know whether the receiver’s

audio-squelch circuitry uses Continuous-Tone-Controlled Squelch System (CTCSS)

or Continuous Digital-Controlled-Squelch-System (CDCSS).

2. Parameter 9, RX CT/CDCSS Control allows the receiver’s audio-squelch circuitry

for CTCSS or CSCSS to be controlled by the test operator.

3. Parameter 10, RX CT/CDCSS Deviation sets the amount of deviation on the signal

modulating the CTCSS tone or CDCSS code word which is input to the receiver’s

antenna during the CT/CDCSS opening test.

4. Parameter 24, TX CD/CTCSS Available lets the test set know that the radio

transmits a carrier modulated with a CTCSS tone or CDCSS code word.

5. Parameter 25, TX CD/CTCSS Control allows the transmitted CTCSS tone code or

CDCSS code word to be controlled by the test operator (that is, turned on and off).

6. Parameter 26, TX CD/CTCSS Filter 1 Opt allows the CD/CTCSS filter (test set

Option 010 400 Hz High-Pass Filter) to be used by the test set if one is installed.