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Table 2-2 KWM-2/2A Operating Control Functions
FIG 2-1
INDEX
CONTROL
FUNCTION
1.
Function (S11)
OFF
ON
NB
CAL

Removes ac power from power supply.
Connects ac power to power supply
Turns on accessory noise blanker when used
Turns on 100-kHiz crystal calibrator
4
MIC CAIN (R8 S10) Controls audio amplifier gain for SSB operation, and controls tone level for CW operation.
6
EXCITER TUNING Controls all ganged slug tuned circuits In receiver and exciter portion or transceiver
12
Crystal board selector
(S15) (in KWM-2A only)
Selects second bank Of crystals for additional coverage and changes scale BAND switch
3
BAND (S2 through S8, S13) Selects capacitors and crystals needed to tune transceiver to desired 200-kHz band. S13 grounds a different pin on J25 for each band for remote antenna selection
7
P.A. TUNING (C150) Resonates to pa Plate circuit to operating frequency
5
AF GAIN (R92) Controls receiver audio amplifier gain
10.
R.F. GAIN R84) Controls gain of receiver-transmitter rf amplifier and receiving it amplifiers during receiving.
8
Meter switch (S12)

PLATE
GRID
ALC
Measures pa plate current by measuring pa cathode voltage changes
Measures pa grid current
Shows ALC action by measuring cathode voltage changes at transmitter if amplifier V4A.
2
EMISSION (S9)

LOCK
TUNE
LSB
USB
CW
Measures pa plate current by measuring pa cathode voltage changes
Reduces pa screen voltage with series resistor, and produces CW carrier for tuneup
Selects LSB bfo crystal and raises vfo frequency for LSB operation
Selects USB bfo crystal and lowers vfo frequency for USB operation.
*
ANTI-VOX CAIN (R45) Controls level of anti VOX signal fed to VOX circuit

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