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|  MIL-T-48621A (AR)
4.7.3.3
RF IN.
a.
Set up equipment as shown in Figure 1, with one power
meter (Items 6 and 8, Table 111) connected to the
W/G-to-Type N adapter (item 13, Table III) and the other
power meter (items 7 and 9, Table III) connected to the
waveguide-to-Type N adapter (item 14, Table 111) at the
output of the directional coupler (item 10, Table III)
through coaxial cable w201 (item 41, Table III).
Set the microwave power source (item 18, Table 111)
b.
channel selector to channel 1 (see Table IV, Frequency
conversion charts). Apply +28 + 1 Vdc at 1A from the
power supply (item 1, Table XII) as monitored by the DVM
(item 4, Table III) and ameter (item 3, Table III).
Adjust the variable waveguide attenuator (item 16, Table
c.
III) for a reading of +10 DBM on the power meter (items
7 and 9, Table III) connected to cable W201 (Item 41,
Table III).
d.
Read the power meter (items 6 and 8, Table 111)
connected to the W/G-to-Type N adapter (item 13, Table
111) and record this power level in column 2 of Table
IV.
e.
Repeat steps c. and d. for all twelve channels of the
microwave power source (item 18, Table III).
f.
Set the microwave power source (item 18, Table III)
channel selector to Channel 1.
Disconnect the power meter (Items 7 and 9, Table 111)
g.
from cable W201 and connect W201 to RF IN port of the
noise tester.
h.
Using Table V (Output signals) as a guide, adjust the
variable waveguide attenuator (Item 16, Table 111) for
+10 DBM Input signal to the noise tester, as indicated
on the power meter (items 6 and 8, Table III).
28
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