Table 2-2. Adjustable Components (2 of 3)

 

Reference

Adjustment

Adjustmend

Description

 

Designatol

 

Name

 

Number

 

 

A5T500

XTAL

CTR

3

3

Adjusts center frequency of third stage of crystal

 

 

 

 

 

 

bandwidth filter to 10.7 MHz.

 

A5T502

XTAL

CTR

4

3

Adjusts center frequency of fourth stage of crystal

 

 

 

 

 

 

bandwidth filter to 10.7 MHz.

 

A6R410

HV ADJ

 

1

Adjusts the voltage between A6TP405 and A6TP401

 

 

 

 

 

 

to the voltage marked on the A6Al High Voltage

 

 

 

 

 

 

Module.

 

AlOR

-10 dB ADJ

9

Offsets power level range of A10 Tracking

 

 

 

 

 

 

Generator.

 

AlOR

3 dB ADJ

 

9

Adjusts gain of power level range of A10

 

 

 

 

 

 

Tracking Generator.

 

AlOC3

TRK OSC CTR

20

Centers range of A10 Tracking Generator’s

 

 

 

 

 

 

tracking oscillator.

 

A14R42

5.01 GHz

 

7

Adjusts the main coil tune driver current at a

 

 

 

 

 

 

YTO frequency of 6.01 GHz (near the upper YTO

 

 

 

 

 

 

frequency limit).

 

A14R76

FM SPAN

 

7

Adjusts the FM span accuracy by affecting the

 

 

 

 

 

 

sensitivity of the FM coil driver.

 

A14R93

3.2 GHz

 

7

Adjusts the main coil fixed driver current at a

 

 

 

 

 

 

YTO frequency of 3.2 GHz (near the lower

 

 

 

 

 

 

YTO frequency limit).

 

A14R621

;O AMPTD

 

8

Adjusts the amplitude of the first LO by changing

 

 

 

 

 

 

the reference voltage for the leveling loop.

 

414R628

>ATE

BIAS

 

8

Adjusts the gate bias for the A7 LO Distribution

 

 

 

 

 

 

Amplifier.

 

415ClOO

;MPL MATCH 1

6

Transforms the sampler input impedance to 50 ohms

 

 

 

 

 

 

3ver the 280 to 298 MHz range.

 

A15C210

VCO

RANGE

6

Adjusts the VCO tank capacitance so that 21 V

 

 

 

 

 

 

on the VCO tune line equals 298 MHz VCO frequency.

 

A15C629

298 MHz ADJ

17

Fine adjusts the 298 MHz SIG ID Oscillator

 

 

 

 

 

 

frequency to optimize its performance.

 

A15R237

SMPL

PWR

ADJ

6

Adjusts the signal power level to the Sampler.

 

A15U302

10 MHz ADJ

 

12

Adjusts frequency of the temperature

 

 

 

 

 

 

compensated crystal oscillator (TCXO) to 10 MHz.

 

A15R453

PHASE DET

6

Adjusts bias at pin 3 of phase detector A15U408 to 1.80 V.

 

 

BIAS

 

 

 

 

 

A15R726

500 MHz

 

18

Adjusts input power to ECL divide-by-two chip.

 

 

4MPLITUDE

 

 

Adjustment Procedures 2-7