TA1290FN

2001-02-26 8/13

Note 8:

Suppression of career

Add the 2nd AGC terminal from external power supply, so that the output video signal voltage

equation.

Note 9:

Suppression of career harmonics

Add the 2nd AGC terminal from external power supply, so that the output video signal voltage

Turning modulation off, measure output career (117.5MHz) level (Vcareer [Vp-p]) at pin 15.

Calculate the following equation.

(Suppression of career harmonics) = 20 og

l

Note 10:

AFT control steepness

Input the above signal and adjust the AFT coil so that the AFT output voltage is 4.5V.

Measure AFT output voltage of following conditions.

AFT control steepness is calculated by following equality.

Note 11:

Intermodulation

Input following composite signals to the PIF input.

SG : 1

58.75MHz, 84dBµV (picture career)

SG : 2

54.25MHz, 74dBµV (sound career)

SG : 3

55.17MHz, 74dBµV (chroma)

Supply DC voltage to 2nd AGC terminal from external source, so that bottom of output signal

voltage (15-b) matches sync. tip level. Measure the difference of output signal voltage at pin 15

between 3.58MHz component (chroma) and 920kHz component.