This session covers the build of the actual VFO PCB shield. The shield carries both the VFO module, a SN74AC74 IQ generator and the RTC module.
The build needs a number of tools including a good small-point soldering iron of reasonable wattage (>40W suggested), cutters, tweezers and a lens for SMD mounting.
The first thing to do is to mount the SMD device, the SN74AC74. This mounts with the ident at the bottom.
Next mount the passive components (just three parts).
The the two modules Si5351 and RTC.
Lastly the headers with connections to the Arduino (2 x 8 & 2 x 6 pin), the RFbus (8 pin) , the Rotary Encoder (5 pin) and the LCD (4 pin).
At this point you are ready to test your VFO. Plug it into your Arduino, power it up and load the sketch My_VFO_40M. This will give you a VFO for the 40m band. It will display the frequency and the Band Plan. Pushing the encoder shaft/button will change the tuning steps from 100Hz to 1kHZ to 10kHz and back again.
Final board
Thursday 1 October 2015
Concept Session 5 - VFO Build
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