05-07-2012, 04:53 PM
Today I brought the oscillator to work, plugged it in and watched the waveform on the scope (have brand-spanking new Tek with 1GHz bandwidth).
Well, the signal does not look very symmetrical, the lower half looking distorted, and I am not even sure whether it is OK or not (I used to have a brand new transistor oscillator, and the signal looked the same, which I remember puzzled me); I thought it should be pure sine wave. Only on one bad it is a sine wave.
Good news is - on all bands the frequency is absolutely right on the money; what the scale shows, that what the frequency indicated on the scope is. Very accurate.
It uses to miniature tubes, which I am sure are OK, if it generates at 130MHz. Need a sch to look why the asymmetry.
PS. Found the sch. The thing is as simple as falling off a log, or as we say in my language, as steamed turnips.
Will look.
Well, the signal does not look very symmetrical, the lower half looking distorted, and I am not even sure whether it is OK or not (I used to have a brand new transistor oscillator, and the signal looked the same, which I remember puzzled me); I thought it should be pure sine wave. Only on one bad it is a sine wave.
Good news is - on all bands the frequency is absolutely right on the money; what the scale shows, that what the frequency indicated on the scope is. Very accurate.
It uses to miniature tubes, which I am sure are OK, if it generates at 130MHz. Need a sch to look why the asymmetry.
PS. Found the sch. The thing is as simple as falling off a log, or as we say in my language, as steamed turnips.
Will look.
