One more issue with the Heathkit vfo/DX-60b problem is that the vfo outputs 7 mhz for 40-10 meters.? The radio x2 x3 or x4 to get the correct frequency.....so, a 100 hz drift on 40 meters becomes a 400hz drift over the same time period on 10 meters.
The HG-10 can be more stable than it was designed by completely rebuilding the vfo (re: temperature stable caps, removing heat, etc) but an accurate Huff and Puff implementation would fix it completely, once set up properly.
I am starting on a homebuild PTO vfo using a kit from qrpguys, that I hope to use as a test bed for making a stable 5mhz PTO for an a.m. transmitter build.? I might just throw my hands up in the air, in the end, but I would like to see what I can do.
