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.
