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Chapter 4, Test, Parameter, and Pass/Fail Limit Descriptions

Pass/Fail Limit 9, RX CT/CDCSS Opening Level

The Continuous Tone-Controlled Squelch System (CTCSS) and Continuous

Digital-Controlled Squelch System (CDCSS) opening level is the level of the RF

signal applied to the receiver’s input (with the squelch tone on for CTCSS, or the

code word input for CDCSS) that causes the radio to de-squelch.

This is used with

Pass/Fail Limit 7, RX CDCSS SINAD at Opening to set the pass/

fail limits for testing receiver CTCSS and CDCSS opening.

Pass/Fail limits are determined from an applicable radio specification or industry

standard, such as:

• Radio specification: Threshold Squelch Sensitivity

• Industry standard: EIA/TIA-603, Section 2.4.1, Squelch Opening SINAD

For Example:

If your radio specification defines the Threshold Sensitivity as 0.5 µV and you

want to test the radio’s upper limits, you would enter

0 in the lower-limit column

and

0.5 in the upper-limit column. Limits are entered in µV.

It’s Used in the Following Test:

TEST_17. RX CTCSS/CDCSS Opening