Hallicrafters HA-1, Operating And Service Instructions

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4-5. WEIGHT CONTROL
The WEIGHT control (knurled shaft), located on the rear panel, and referred
to as the mark-space ratio adjustment, sets the time relationship of a dot (or
mark) to its following space. For normal CW work this is usually set for a ratio of
1 to 1. Other ratios can be obtained to accommodate various transmitter keying
characteristics or to suit personal preference (see figure 6).
To adjust the WEIGHT control, proceed as follows:
(1) Turn the control to its maximum counterclockwise position; the unit
will key a long mark with a short space.
(2) Turn the control to its maximum clockwise position; the unit will key
a short mark with a long space.
Figure 6. Dot-Dash-Space Relationship With Various Weight Control Settings.