Heathkit SB102 - Transmit Audio Enhancements; Modulator Audio Frequency Response; First Transmit Mixer Drive Boost

4
Transmit Improvements:
The transmitter audio quality can be improved by changing the value of coupling
capacitor C11 on the modulator board from .001 µfd to .01 µfd (Figure 4). This will
increase the low frequency response and give the transmit audio a little more “body”.
If 10KΩ resistor R202 is present between the I.F. circuit board (L101 pin 4) and the
bandpass circuit board (V5 pin 2), remove and replace it with a piece of insulated hook
up wire (Figure 3). This will increase drive to the 1
st
transmit mixer. This change is
already incorporated in later model HW-101s.
Figure 3