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displayed frequency will change with the rotation of R54, the tuning potentiometer. The high
frequency end of the VFO tuning range is set by trim capacitor TC6 and the low frequency end
by trim resistor R78. Adding in the RIT circuitry (in a later step) will change the tuning range
and span of the VFO.
Your Measurements/Observations - ______________________________________________
____________________________________________________________________________
VFO Buffer
[ ]
Install Q15
[ ]
Install resistors R61, R62, and R65.
[ ]
Install capacitor C81.
Your PCB should look like that shown in the next figure.
Test – Apply power to the PCB. Connect an RF probe or oscilloscope to the top of resistor R62.
- Figure 21 -
20
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