Technical data

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

Pass/Fail Limit 16, RX Tight Squelch Sensitivity

This sets the pass/fail limits for testing a receiver’s audio-squelch sensitivity (in

TEST_15. RX Audio Squelch Sensitivity and TEST_20. RX Quick Test), with

squelch set to maximum and volume adjusted for the “threshold squelch” setting,

and for testing squelch blocking (in

TEST_16. RX Squelch Blocking).

Pass/Fail limits are determined from an applicable industry standard, such as:

• Industry standard: EIA/TIA-603, Section 2.1.13, Audio Squelch Sensitivity,

• and Section 2.1.14, Squelch Blocking

For Example:

If your industry standard specifies that the RF signal required for tight audio-

squelch sensitivity shall be no more than 20 dB greater than the measured

reference sensitivity value, and the radio’s specification for usable sensitivity is

1 µV, you would calculate the upper limit for tight-squelch sensitivity to be:

Therefore, enter

0 in the lower-limit column and 10 in the upper-limit column.

Limits are entered in µV.

It’s Used in the Following Tests:

TEST_15. RX Audio Squelch Sensitivity

TEST_16. RX Squelch Blocking

TEST_20. RX Quick Test

20log

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

20=

10()

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1µV()10()

10µV==