Reply To: Strategy for Changing Capacitors and Trim Pots on FM Tuner

#9949
Glitch
BRONZE Member
  • Topics Started 9
  • Total Posts 83

Craig:  I’m pretty happy with the TinySA. It has already provided me sufficient amusement for how much I spent on it. It seems like most of the people using it are HAM radio enthusiasts. But there also seems to be many people trying to adapt it to other, more imaginative, uses. The author of the TinySA software seems to embrace the “alternative usage” and tries to accommodate with patches and Easter eggs. I’m still not 100% sure of the TinySA’s suitability for what I’m trying to use it for. I keep seeing the advice on various websites to buy the “proper equipment” for the job, but it is still not clear to me what the “proper equipment” actually is, or if it can be obtained for a price that I’m willing to pay.

I keep having the the thought that “this would be so much easier if I knew what I was doing” ;-). I’ve found there to be a simultaneous “information vacuum” and preponderance of information relative to this subject matter during my web searches. I’ve been struggling to find information relevant to the tuner design that my particular Beomasters have. I guess the best I can hope for is to plod-on with my experimenting and try to stumble upon a method that gives acceptable results.

On a more positive note, I did make progress on interpreting the “markers” that are on the sweep traces. It looks like the TinySA injects a marker at the ~320kHz and ~640kHz points during the sweep. I set my total sweep to 960kHz so the markers are even. I’m not sure why the TinySA uses these particular values or what the utility of the markers are, but at least it is clear when they are happening.

IF_and_S_curve

Glitch