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Figure 125. Location of optional LO amplifier gain adjust resistor R50
If the voltage is still too low, add R50 (270 ohms – see above picture). See the LO filter and LO Amp
section above for parts placement. This change adds more gain to the amplifier/buffer on the other side
of the LO filter. At this point, repeak filter caps C58 and C60 peaked for maximum voltage at TP3. At
this point the voltage at TP3 will be in the correct range.
RF front end tune up
Figure 126. Location of RF front end band pass filter adjust trim caps, C23 and C25 on top middle of the board
Norcal NC2030 v5
12-18-05
Page 100 of 128
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