MODEL 8559A

r-

ADJUSTMENTS

TABLE53. FACTORYSELECTEDCOMPONENTSIN ALPHA-NUMERICALORDER

Reference Designator

Basis of Selection

Adjusts bias on DPM Clock Oscillator. Selected t o provide delay compensation

for main coil sweeps. Adjusts YTO sweep linearity. Adjusts YTO sweep linearity.

Selected t o provide delay compensation for FM coil swept spans.

Selected t o optimize Main Coil Span Accuracy.

Selected t o optimize Main Coil Span Accuracy.

Shifts adjustment range of A8R34 REG. Selected t o set low end of sweep ramp. Selected t o set high end of sweep ramp. Selected t o optimize 1 kHz Bandwidth. Selected to optimize 3 kHz Bandwidth. Selected to optimize 10 kHz Bandwidth. Selected t o optimize 300 kHz Bandwidth. Selected t o optimize 1 MHz Bandwidth. Selected t o optimize 3 MHz Bandwidth. Adjusts gain of Flatness Compensation

Amplifier t o compensate for gain of A12 flatness circuitry.

Selected to shift adjustment range of A1 1C23. Should be same value as A1 lC20.

Selected to shift adjustment range of A1 1C23. Should be same value as A1 l C l 6 .

Selected t o shift adjustment range of A11C45. Should be same value as A1 lC64.

Selected t o shift adjustment range of A11C45. Should be same value as A1 lC43.

Adjusts XTAL bandwidth amplitudes relative to LC amplitudes.

Selected to give correct I F bandwidth for RESOLUTION BW of 100 kHz.

Selected to give correct IF bandwidth for RESOLUTION BW of 30 kHz.

Selected t o shift adjustment range of A11 R26.

Selected to give correct I F bandwidth for RESOLUTION BW of 100 kHz.

Selected to give correct I F bandwidth for RESOLUTION BW of 30 kHz.

Reference Designator

Basis of Selection

Selected t o equalize feedback between LC stages (not field selectable).

Selected to optimize 3 MHz t o 1 MHz bandwidth amplitude and frequency correlation.

Adjusts Band 3 breakpoint for frequency response.

Shifts adjustment range of A12R72 V1. Shifts adjustment range of A12R71 V3-. Shifts adjustment range of A12R70 V3+. Adjusts reference voltage t o A12U2 for

diode bias.

Shifts adjustment range of A12R83 V2-. Shifts adjustment range of A 1 2 R 7 V2+. Selected to shift adjustment range of

A13C23. Should be same value as A13C20.

Selected t o shift adjustment range of A13C23. Should be same value as A13C16.

Selected to shift adjustment range of A13C45. Should be same value as A13C64.

Selected to shift adjustment range of A13C45. Should be same value as A13C43.

Adjusts XTAL bandwidth amplitudes relative to LC amplitutles.

Selected t o give correct IF bandwidth for RESOLUTION BW of 100 kHz.

Selected to give correct I F bandwidth for RESOLUTION BW of 30 kHz.

Selected to shift adjustment range of A13 R 2 .

Selected to give correct I F bandwidth for RESOLUTION BW of 100 kHz.

Selected to give correct IF bandwidth for RESOLUTION BW of 30 kHz.

Selected t o equalize feedback between LC stages (not field selectable).

Selected to shift adjustment range of A1 1R34.

Selected to shift adjustment range of A1 lR34.

Selected to shift adjustment range of A1 lR23.

Selected to provide increased range adjustment for 1 dB offset circuit.