Adjust the CARRIER NULL capacitor for minimum RF output. ( ) If necessary, repeat the
adjustments of the CARRIER NULL control, and the CARRIER NULL capacitor until the RF
output or null reading is about the same on both the LSB and USB positions of the MODE
switch. (The output should null down to a quarter of a volt or less, if an RF volt-meter is
available.)
CAUTION: The 6.8 MHz trap coil is sealed, and should not be turned.
Turn the MODE switch to TUNE. Tune for maximum output, and adjust the RELATIVE POWER
control for a 6 to 8 meter reading.
Leave the BAND switch at 3.5, and adjust for a maximum output. Then set the MIC/CW LEVEL
control for a grid current reading of about 0.3 ma
s.2.1. Final Heterodyne Oscillator Alignment
Note: If adjusting from the bottom side of the chassis, the 3.5 MHz core is also the
core on the 7 MHz coil that is closest to the chassis, the 14 MHz core is also the
core on the 21 Mhz coil that is closest to the chassis and the 28.5 MHz core is also
the core that is closest to the chassis on the 29.0 MHz coil.
1. Adjust heterodyne oscillator coil 3.5 for maximum grid current, with the tuning on the "slow"
side of the peak.
2. At each position of the BAND switch, adjust the heterodyne oscillator coil for maximum grid
current. Adjust the coil that has the same number as the BAND switch position.
3. Check the grid current at each position of the BAND switch. The maximum grid current
reading should be near or over full scale on each band.
s.2.2. Driver Neutralization Adjustment
1. Set the BAND switch at 21.0 and turn the Main tuning dial to read 21.2 MHz.
2. Position the free end of the driver neutralizing wire into hole W in the RF –driver circuit
board as shown in Figure 1-1 (foldout from Page tbd).
3. Adjust the DRIVER PRESELECTOR control for maximum RF output; then turn the control
back and forth to see if this produces a smooth peaking in RF output.
4. If the turning of the DRIVER PRESELECTOR control causes ragged changes in the RF
output, readjust the position of, or bend, the driver neutralizing wire to produce a smooth
peaking in RF output.
5. Check the final neutralizing again at 14.2 Hz as in the last step on Page 95.
6. Rezero the S-Meter while receiving, with the BAND switch at 29.5. Then check to be sure
the meter reads zero in each Band switch position. If the S-Meter does not read zero on any
band, readjust the heterodyne oscillator coil for that band, as directed in previous steps.
Alignment Page 38
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