06-06-2017, 01:37 PM
I think the Foster Seeley diagram I have is what misled me a little. Last night I located a discriminator circuit closer to the design. After that, Lawrence's explanation made perfect sense. So, I figure so far as valve radio goes I can understand typical circuits. However, as to transistor circuits I understand very little.
I am officially on break from radio work due to urgent work to finish my boat although the weather has literally grounded me since the weekend.
At night I've been doing some stuff I think Lawrence would relate to in interest. I wanted to get a better understanding of modulation so was going over modulation percentage and PM plus FM. The very first introduction I had to this was via Chas Miller's beginner article but, when you start, it's hard to really grasp the concepts. Sometimes I go back to older stuff like push pull. And here's the very simple thing I learned: The power output of a valve will always be less efficient than the input because energy is lost in the plate heat and impedance. It's a simple but interesting point - especially when you consider the 40's engineers struggled over battery efficiency.
I am officially on break from radio work due to urgent work to finish my boat although the weather has literally grounded me since the weekend.
At night I've been doing some stuff I think Lawrence would relate to in interest. I wanted to get a better understanding of modulation so was going over modulation percentage and PM plus FM. The very first introduction I had to this was via Chas Miller's beginner article but, when you start, it's hard to really grasp the concepts. Sometimes I go back to older stuff like push pull. And here's the very simple thing I learned: The power output of a valve will always be less efficient than the input because energy is lost in the plate heat and impedance. It's a simple but interesting point - especially when you consider the 40's engineers struggled over battery efficiency.
