Matt, for many of us building a piece of test equipment that we can
inexpensively buy used on eBay is much like wanting to build a pair of
pliers or a screwdriver from scratch. It's simply not worth the time
and expense.

I use a simple Heatkit r.f. signal generator that I purchased on eBay,
and paid something like $12 for it less shipping. It performs every
function I need. If I could even find the need components to build it
today, they alone would cost me far more than $20.

Take this for whatever it's worth.

Harry C.