Operating instructions

ANL Switch
Automatic Noise Limiter
SPOT Switch
Inserts carrier for AM tuning in REC position.
Meter Switch
Reads cathode current in P.A. CATHODE position.
Reads S-UNITS in S-METER position. Reads RELA-
TIVE OUTPUT in S-METER position when Function
Switch is in TUNE-CW positi.on.
DIAL SET
Dial adjustment can be made at any 100 KHz point
with Calibrator on.
MIC
Microphone plugs into this jack.
CONTROL FUNCTIONS, REAR PANEL
P .A. BIAS
J. Adjust idling current for P .A. Tube. (40 ma.)
A'JX RELAY.
12 volts DC for auxiliary relay control.
CW KEY
CW key plugs into this jack.
ANTENNA
Antenna feedline (50 .75 ohm) plugs into this
connector.
FUSE HOLDER
4 amp fuse.
EXT OSC
Model 508 or 51 OX external VFO connection.
HEADPHONES
Headphones plug into this jack. Disconnects internal
speaker.
S-METERZERO
Adjust S-Meter to zero with antenna disconnected.
POWER CONNECTOR .
AC power cord plugs in to this connector. Model14A
DC converter plugs in to this connector for mobile
operation.
TUNE-CW -Transmitting circuits are energized.
CIS02 is disconnected from ground, shifting the
carrier frequency into the Cuter passband. Carrier
is fully inserted. P .A. ca thode resistor, R406 is
switched in the circuit, reducing input power.
Transmitter is tuned in this position. CW trans-
missions made in this position.
MIC. GAIN
Controls potentiometer R1404 in the grid of V14A,
and controls amount of audio to the balanced modu-
lator.
R.F. GAIN
Controls variable resistor RS05, common in the grids
of Receiver Mixer, V6; RF amplifier, V5; LF. Ampli-
fiers, V7 and V8.
A.F. GAIN
Controls potentiometer R1101 in grid circuit of AF
output, VII, and controls audio volume.
MAIN TUNING
Controls C1608 in frequency determining tank cir-
cuit of VFO.
DRIVER
Controls C2A and C2B in plate tanks of transmitter
Mixer and Driver.
P .A. TUNE
Controls C407 in Pi-network to tune fmal power
amplifier plate to resonance.
P .A. LOAD
Controls C408 in Pi-network to match impedance of
output load. Tunes input to Receiver RF. Amplifier.
BAND SWITCH
Switches tank coils and associated capacitors in VFO,
VFO Amplifier, Driver, and Transmit Mixer.
Sideband Selector Switch
L5B -Receive and Transmit on Lower Sideband.
USB -Receive and Transmit on Upper Sideband.
AM REC. -Receive AM signals. (Insert carrier with
Carrier Insertion control to transmit.)
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FIGURE 2. SILTRONIX MOPEL 10118, REAR VIEW.
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