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HP 11757B
Recovery Time
Test
Note
In the recovery time test the Fader breaks the IF path of
the digital radio and then measures the time the radio
takes to recover lock. The time the radio is out of lock is
measured at the ALARM INPUT of the Fader.
There are two variations on this test that you may want
to try. You can measure the time it takes to recover
when a notch is in the IF path after a break in lock.
You may also measure the time it takes to recover to a
speci ed bit error rate (requires Bit Error Rate Tester).
The procedure that follows covers all three variations.
The BERT is only required for return to bit error rate
testing.
Some radios have their own internal error checking
scheme. This would eliminate the need for a BERT in
bit error rate checking.
Figure 1-6. Recovery Time Test Setup
Digital Radio Testing
1-33
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