The resolution of the main tuning digital readout can be increased
from 100Hz to 10Hz. No digits are lost since the readout has the
extra digit for this purpose. This change can be accomplished by
grounding pin 1 of connector 8 on the digital unit PCB.
The tuning rate is 10KHz per revolution of the main tuning knob.
The tuning rate can be changed to 5KHz per revolution by removing
or lifting one end of diode D-13 on the digital unit PCB.
Note that the black marks on the tuning knob itself are exactly
500Hz apart. The knob can be "corrected" by tuning in an exact
frequency, such as 10,000.00KHz, pressing the DIAL LOCK switch,
then turning the knob to line up a black line. As long as you don't
spin the dial too fast, it will track nicely from one end to the
other. With the slow rate tuning modification above, the dial
increments become 250Hz per division.
You may desire to switch the new reduced tuning rate on and off.
For example, you can select the new rate on just VFO B by using an
unused section of the FUNCTION switch to make or break the circuit
on diode D-13. Another pssibility is to use the display DIM switch.
There are an additional 8 memories available. These can be util-
ized by grounding pin 5 of connector 7 on the digital unit PCB.
This lead is designated as "M3". The additional memories can be
selected by using the unused contac on the FUNCTION switch or by
adding a new switch.