It sounds like you are building one like I did. I took Nick's code and added code to use an encoder
and LCD to allow a "local mode". This adds the capability to use it as a stand-alone RF signal
generator with sweep function and scope sync so I can align adjustable filters in real time.
VERY USEFUL to me.
I built mine in a single aluminum project box using ugly construction but it works great.
See folder "WB6OGD Local and Sweep Version" if interested. Photos in album
"WB6OGD hot rod PHSNA".