
16. YTO Loop Adjustments
16.
YTO
Loop
Adjustments
Reference
RF-Section:
Al lA5 Sampler
AllA
YTO Loop Interconnect
Related
Performance
Tests
Average Noise Level Test
Description
The output power level of the
AllAl
Coupler/Isolator/Amplifier (CIA)
is checked over the 2.2
GHz
to 6.2
GHz
tuning range of the All YTO
Loop, and the Al lA3 YTO is tuned to the minimum power frequency.
Then, the CIA GATE BIAS is adjusted for a -5.0
dBm
output power
level at the coupled output of the
AllAl
CIA. The YTO Loop
AllA
Sampler is driven by a synthesized sweeper and the dc output of
Sampler Al
1Ul
is monitored with an oscilloscope. The Sampler Driver
circuit is adjusted for maximum amplitude and flatness over the
range of the
M/N
Loop. The YTO Loop Sampler IF amplifiers are then
adjusted for correct output level and frequency response.
Equipment
Spectrum Analyzer
.........................................
HP 8566B
Synthesized Sweeper
....................................
.HP
8340A/B
Digitizing Oscilloscope
....................................
HP
545OlA
Power Meter/Power Sensor
..........................
HP
436A/8481A
SMA (m) 50 ohm Termination
..............................
1810-0118
Adapters:
Type N (m) to APC 3.5 (f) Adapter . . . . . . . . . . . . . . . . . . . 1250-1744
Adapter, BNC to Alligator Clip . . . . . . . . . . . . . . . . . . . . . . 1250-1292
Cables:
Low-loss Microwave Test Cable, APC 3.5 . . . . . . . . . . . . . .
.8120-4921
BNC TO SMB Snap-On Test Cable (2
required) . . . . . . . . . .85680-60093
Procedure
1. Set the spectrum analyzer (DUT) LINE switch to STANDBY. Turn
the spectrum analyzer over to position the RF Section on top, as
shown in Figure 3-69. Remove the RF Section’s bottom cover.
2. Disconnect semi-rigid coax cable
Wll
from
AllAl
CIA Assembly’s
YTO OUT connector. Disconnect the opposite end of
Wll
from
AT2 (for RF Sections 2526A and below, disconnect from cable
A6W6).
See Figure 3-70 for the location of
AllAl,
Wll,
A6W6,
and AT2.
Adjustments 3-135
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