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190-00133-02 Rev B 3-7
PARAMETER SPECIFICATION
Rise Time: 50-100 nS
Fall Time: 50-200 nS
Pulse Width: 350-550 nS
Figure 3-2. Example Of Acceptable Reply Pulse
3.3.3.6 Dynamic Range
1. Set the GTX 320 mode select switch to the ON position.
2. Set the ATC 1400A SLS/ECHO thumb wheel switch to -9.
3. Flip the SLS/ECHO toggle switch to the ON position.
4. Increase the RF level to 50 dB above MTL (a value of -21 dBm assuming an MTL of -71 dBm). The percent
reply shall be at least 90% as indicated on the ATC-1400A.
______ % Reply
3.3.3.7 Automatic Overload Control (AOC)
1. Set the SLS / ECHO toggle switch back to the OFF position.
2. Increase the RF level to 3 dB above the MTL.
3. Set the PRF thumb wheel switches to 1200 Hz on the ATC-1400A test set. The reply rate shall be 90% to 98%.
Note: In order to obtain an accurate reading, the unit must be warmed up before performing this test.
______ 90 % to 98% Reply Rate
4. Reset the PRF thumb wheel switches to 500 Hz on the ATC-1400A test set.