TB 9-6625-2355-35
produce +40.0 dBm 0.1 dB at the direct port, J102 as monitored by the measuring
receiver in tuned level mode.
(27) Press the "Temporary Write" button. The TI's measured power level is
displayed on the computer in the window to the right of the calibration factor.
(28) Verify the measured value displayed on the monitor is +40.0 dBm 1.5 dB. If
not, perform b below.
(29) Set the synthesizer signal generator output power to "OFF".
(30) On the computer, press the "Send All" button to permanently store the
calibration factors in the TI.
b. Adjustments.
Press up or
down arrow key to
adjust the
calibration factor shown in
red. Press "Temporary Write" to test the new value while observing measuring receiver
indication.
a. Performance Check
(1) On the computer, verify the "Antenna TX/RX 1030" is 0.
(2) On the computer, verify the "Antenna TX/RX 1090" is 0.
b. No adjustments can be made.
a. Performance Check
(1) Carefully measure the resistance between the center and outer conductor of the
difference (∆) port J1 on the antenna.
(2) Should measure 25 3 ohms. If not, replace antenna.
(3) Carefully measure the resistance between the center and outer conductor of the
sum (∑) port J2 on the antenna.
(4) Should measure 25 3 ohms. If not, replace antenna.
a. Deenergize and disconnect all equipment.
b. Reattach antenna A5 to test set ensuring the coaxes are within the antenna
channels without pinching between the antenna and cover. Ensure the two center screw
holes line up with the test set holes.
c. If the screws do not line up, recheck the coax connections, as reversing the long and
short coaxes will orient the antenna backwards.
d. Annotate and affix DA label/form in accordance with TB 750-25.