FIRST AND SECOND IF. AMPLIFIERS MODULE A8300.

TM 11-5820-670-30

1-36. 11.5 MHz MODULATOR MODULE A8100. (CONT)

The combined signal from the audio mixer is applied to the capacitance diodes which causes the fre-

quency of oscillator Q8101 to deviate. Fm 11.5 MHz output from Q8101 is applied to buffer amps Q8102

and Q8103 for amplification, and then applied to phase discriminator A8200.

The 11.5 MHz fm signal from buffer amplifier Q8103 is also applied to the crystal discriminator. The

crystal discriminator compares 11.5 MHz fm with 11.5 MHz from crystal Y8101.

If oscillator Q8101 drifts above or below 11.5 MHz, the crystal discriminator will apply a positive or

negative dc voltage to the capacitance diodes, correcting the 11.5 MHz frequency.

1-37. FIRST AND SECOND IF. AMPLIFIERS MODULE A8300.

EL1AT11O

11.5 MHz if. from mixer A1400 is applied to the first and second if. amplifiers for amplification.

Unmodulated 11.5 MHz if. is applied from the second if. amp to phase discriminator module A8200.

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