Table 11-4 lists the RF Section mnemonics shown in Figure 11-5 and provides a brief description of each.

Table 11-4. RF Section Mnemonic Table

Mnemonic

 

Description

 

 

MAIN COIL+, MAIN COIL-

YTO Main Coil Tune Signal

FM+, FM-

YTO FM Coil Tune Signal

LO SENSE

LO Amplitude Sense Voltage

LEVEL ADJUST

LO Amplitude Adjustment Voltage (PIN ATTEN)

GATE BIAS

LODA

Gate Bias Voltage

XMX

External

Mixer; +lZV=EXT MIX

 

- 12V=INT MIX

SID

SIG ID Oscillator ON +12V=SIG ID OFF

 

-8V=SIG ID ON

PIN DIODE SWITCH

PIN Diode Switch Control For 2ND Conv. IF Output

RFGAIN

Voltage to Control Gain of Flatness Comp. Amps.

RFGAIN 1 and RFGAIN 2

Currents to Drive PIN Diodes in Flatness Comp. Amps.

LlOdBA, L20dBB, LZOdBC, L20dBD

Control Lines to Set Attenuator Sections A, B, C, and D

 

to Attenuate Position (Active Low)

lOdBA, 20dBB, 20dBC, 20dBD

Control Lines to Set Attenuator Sections A, B, C, and D

 

to Attenuate Position (Active High)

 

 

 

RF Section 1 I-17