On the right of the front panel are the PFG controls:
• The Bits selection switch (SW4).
• The PFG amplitude potentiometer (Figure 1, R2).
• The high speed oscillator
frequency band switch
• The Coarse and Fine
(Figure 5, R22 and R23).
In the center of the front
panel is the Mode selector switch
(SW1) used to choose between
the frequency counter, VVR, and
several other user preprogrammed
I mounted all the non-front
panel components on two
solderable prototype boards. The
boards each have 1,258 points
arranged in a grid much like other
popular solderless breadboards.
Construction drawings can be downloaded at the
■ FIGURE 6. Front panel switch and display schematic.
34 November 2016