I've been considering having a play with Huff n Puff VFO stablizers for quite some time; there are plenty of resources out there to explain this concept:
I've been reading with interest the experiments done by Hans Summers:
And have had a go today at building his 2-chip VFO + Huff Puff; which is an exceptionally clever design.
Here's a picture of the schematic as drawn by Hans:
I've built it using veroboard, and paid no real attention to layout:
Now the output from this VFO is, as you would expect, rock solid:
What I'm planning to do is build a QRSS beacon and receiver for the shack:
Next is to build a Huff Puff stablised VFO on 10.140MHz for the QRSS receiver, and then think about how to build the beacon....
More will follow.