TM 11-5820-801-30
(2) With the following test equipment listed in
equipment warmup.
the chart below, make the test setup illustrated in figure
(4) The power bridge (AN/USM-260) shall
3-13. Two successive test setups shall be made one with
indicate 150 mW or more (per channel). With the 20-dB
the 20- dB coupler connected to the 2A3 pump
coupler in the measurement line, the bridge actually
waveguide interface (with the other pump waveguide
measures 0.01 times the total power; that is, 1.5 mW (or
(2A1/2A2 inter- face) terminated) and a second with the
more).
20-dB coupler connected to the 2A1/2A2 waveguide
Item
Reference
interface (with the other pump waveguide (2A 1/2A3
interface) terminated). There is no preference in test
Bridge, Power AN/IUSM-260
SIP 431C
order. The channel under test shall be in normal standby
condition. Refer to para- graph 3-7a(2).
Coupler, 20-dB
SM-D-748724
Mount, Bolometer
HP R486A
(3) Make sure that the MAIN (1CB1) and
PAR- AMP (ICB2) POWER circuit breakers are set to
ON. Energize power bridge; allow 30 minutes for test
Figure 3-13. Klystron Oscillator Test Setup.
(5) If the power is below 150 mW, adjust the
screwdriver adjustment on the rear of 1PS1 (1000 V
klystron ocsillator beam voltage by means of the
ADJ) (fig. 3-3). Turn the control to obtain maximum
3-31
