Agilent Technologies 8564EC Service Manual page 85

Table 3-2 Adjustable Components
Reference Adjustment
Designator Name
A5T200 XTAL CTR 1
A5T202 XTAL CTR 2
A5T500 XTAL CTR 3
A5T502 XTAL CTR 4
A14R42 6.01 GHz
A14R76 FM SPAN
A14R93 3.2 GHz
A15C100 SMPL MATCH 6
A15C210 VCO RANGE
A15C629 SIG ID
A15U302 10 MHz ADJ
A15R561 CAL AMPTD
A15R926 EXT BIAS
ZERO
Chapter 3
Adjustment Description
Number
3 Adjusts center frequency of first stage of crystal
bandwidth filter to 10.7 MHz.
3 Adjusts center frequency of second stage of crystal
bandwidth filter to 10.7 MHz.
3 Adjusts center frequency of third stage of crystal
bandwidth filter to 10.7 MHz.
3 Adjusts center frequency of fourth stage of crystal
bandwidth filter to 10.7 MHz.
7 Adjusts the main coil tune driver current at a YTO
frequency of 6.01 GHz (near the upper YTO
frequency limit).
7 Adjusts the FM span accuracy by affecting the
sensitivity of the FM coil driver.
7 Adjusts the main coil fixed driver current at a YTO
frequency of 3.2 GHz (near the lower
frequency limit).
Transforms the sampler input impedance to
50 ohms over the 285 to 297.2 MHz range.
6 Adjusts the VCO tank capacitance so that 21V on
the VCO tune line equals 298 MHz VCO frequency.
19 Fine adjusts the 298 MHz SIG ID oscillator
frequency to optimize its performance.
15 Adjusts frequency of the temperature compensated
crystal oscillator (TCXO) to 10 MHz.
13 Adjusts amplitude of the 300 MHz calibrator signal
to −10.0 dBm.
17 Adjusts zero bias point of external mixer bias.
Manual Adjustment Procedures
Introduction
YTO
97