606 Chapter11
RF Section
A15 RF Assembly
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
HEXTMIXB External Mixer: +12V=EXT MIX
−12V=INT MIX
HSIGIDOFFA SIG ID Oscillator ON: +12V=SIG ID OFF
−8V=SIG ID ON
PIN DIODE SWITCH PIN diode switch control for 2ND conv. IF output
MIXER BIAS Detected voltage on 2ND converter mixer diode
RFGAIN Voltage to control gain of flatness comp. amps.
RFGAIN1 and RFGAIN2 Currents to drive PIN diodes in flatness comp. amps.
L10dB A, L20dB B,
L40dB C
Control lines to set attenuator sections A, B, and C
to attenuate position (active low)
10dB A, 20dB B, 40dB C Control lines to set attenuator sections A, B, and C
to attenuate position (active high)
LDC D, LAC D Control lines to toggle DC/AC input
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