I, too, have built one of these and can attest to the fact that, when kept at
room temperature, it drifts no more than  +/- 0.1 Hz as measured with my
Hewlett-Packard 5245L frequency counter
Andre' N4ICK
********************************
'Geri' Kinzel, DK8KW wrote:

[...] I came accross a nice synthesizer kit. With a frequency range between 1
Hz (!) and 54 MHz
(!) it is a real overkill for the LF band, but the features contained in it
are excellent for what we are doing. The resolution is 1 Hz, the accuracy,
once calibrated is in the same range and long time stability is excellent