Quote:
Originally Posted by Penthode
Did you try increasing the sweep width on the 8601a generator? It appears that tghe sweep width is too narrow. Once you have the sweep width wide enpough to see the s curve, you can use the adjustible markers to ensure you have the 350kHz between peaks. This is very important.
|
Yes I did and I could see the reciprocal downturn and upturn of the curves with a broader sweep but this scope is so fuzzy, any wider on the sweep and the trace just trails off. I'm pretty confident in my assessment that the curve peaks are correct at 21.07mc and 21.43mc and equidistant from the 21.25mc frequency. The curve is pretty straight as it gets close to the carrier frequency on both the + and - sides. You know, this is the best assessment I'm capable of doing at this point on my learning curve. Other than having either you or Bob sitting with me and twirling the knobs and moving the slugs, this may have to do. On the practical side, looking at these adjustment screws on the top and bottom of T-113, I can tell they're pretty close to where they were for years looking at the oxidized surface of the screw outside the can and the shiny surface that's just popped through the "nut" part of the can. It's not a nut really. It's metal pressed on the screw threads from all sides. I know this step is very critical to the rest of the process and I will be certain to do more testing with the scope and sweep and research on this type of circuit to have more confidence in saying it's adjusted correctly.