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Table 2-2 KWM-2/2A Operating Control Functions (cont).
FIG 2-1
INDEX
CONTROL
FUNCTION
*
VOX GAIN (R39) Controls gain of VOX amplifier for voice-controlled operation
*
VOX Time C0NSTANT (R 43) Controls hold-In time of VOX circuit.
INCR LOAD) Adjusts power amplifier output Impedance level to match transmission line Impedance: for maximum power transfer.
11
Zero set knob permits calibration of frequency dial.
13
Vfo tuning dial Selects the frequency to be added to the band frequency to establish the transceiver operating frequency.
*These operating controls are inside the cabinet.

 

 
Warning

During amateur operation. DO NOT operate transmit circuits while the transceiver is tuned to receive outside the amateur band in use. The transmit frequency is always locked to the reeeive frequency Return tuning to within the band before transmitting.

2.4 TRANSMITTER TUNING

2.4.1 General

  1. a. Set up the KWM-2/2A for the receive function as in paragraph 2.3.

  2. b Turn EMISSION switch (2) to TUNE position.

  3. c. . Set meter switch (8) to GRID.

  4. d. Adjust MIC GAIN control (4) for a I/2 to 2/3scale meter indication.

  5. c. . Adjust EXCITER TUNING control (6) for a peak on the meter. Reduce the MIC GAIN as necessary to maintain the l/2- to 2/3-scale meter reading.

  6. f. Set meter switch (8) to PLATE.

  7. g. Dip the plate current with PA TUNING control

  8. h. Adjust the l0ad (under PA TUNING control) for an increase in plate current: redip with PA TUNING control (7). Reduce MIC GAIN control ( 1 ) as necessary to keep the plate current below 200 mA.

 
Caution

TO PREVENT DESTROYING THE FINALAMPLIFIER THE FOLLOWING STEPS MUST BE MADE QUICKLY.

  1. i. Turn EMISSION switch (2) to the LOCK position (leave meter switch (8) at PLATE).

  2. j. Reduce MIC GAIN control (4) to keep plate current below 230 mA.

  3. k. Adjust EXCITER TUNING control (6) for a peak Plate current reading.
  4. l. Readjust PA TUNING control (7) for a plate current dip.

  5. m. Turn EMISSION switch (2) to either LSB USB or CW and meter switch (8) to ALC.

Caution

If the operating frequency is changed more than 50 kHz recheck tuning and loading adjustments. Readjust if necessary.

2.4.2 Single-Side band Operation

  1. Set up receiver operation and transmitter operation according to paragraphs 2.3 and 2.4.1.

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