TM 11-5820-801-30
system according to figure 3-6, sheets 1, 2, 3, 4, and 5,
3-7. RF Gain and Bandwidth Measurements
shall have been completed.
a
Introduction.
(3) Test Setup. One test setup is used for
(1) Types of Measurements. Gain-bandwidth
both gain bandwidth test and alignment procedures. The
measurements are divided into two parts: test and
two procedures are continuous. If during system gain-
alignment The technician first tests the channel
band- width test a fault is indicated, the technician
(Amplifier,
Parametric
AM-6602/MSC-46(V))
to
continues with the test to isolate the fault and then with
determine if a fault exists, and, if so, which stage (2A3 or
the alignment to eliminate the fault. No change in test
2A2) is at fault A fault is defined as gain not within
equipment or test setup is required. Initially use the Test
specified limits (29 5 t I dB) or bandwidth less than 500
Reference Connection (CN-1367/U connected to VG-
MIDz (7250 to 7750 MITz) After a fault has been isolated
1054/U), which is used to calibrate the test equipment
to the first stage (2A3) or the second stage (2A2), the
After the test equipment is calibrated, the equipment to
technician then performs an alignment procedure to
be tested is connected. Using the test equipment in the
correct the fault. If realignment does not eliminate the
chart below, make the test setup illustrated in figure 3-8:
fault, then module removal and replacement is
necessary (para 3-11) The steps are outlined on sheets
Item
Reference
6 and 7 of figure 3-6.
(2) Initial Conditions. The channel to be
Adapter. VG-1054/U (2)
HP H281A
tested shall be in normal standby condition (Refer to IM
Attenuator, 20 dB
HP 8491 A
11-5895-539-12 ). This implies that CRYOGENIC TEMP
meter 1M1 indicates 20 5K, that VACUUM meter 1M2
o
Attenuator, Variable
HP 1t382A
CN- 1 367/U
indicates 20 millitorr or less, that MAIN (ICBI) and
Detector, Crystal
HP 420A
PARAMP (1CB2) circuit breakers and REFRIG (1S1)
Generator, Signal, Sweep
HP 1O01-694C
switch have been set to ON for at least 15 minutes (fig.
Meter, Frequency FR-194/U
HP If523A
Oscilloscope AN/USM-273
Tek 453
the channel not under test shall be illuminated on the
3A1SI display A diagnostic check of the monitoring
3-23
