09-06-2017, 12:27 AM
My boat project work has kept me busy most days. Carpentry is clearly a skill that takes some practise and I'm forced to try and knock frames together and so on.
At nights I've been looking at reactance FM modulation and limiter discrimination circuits. I must say my ARRL 1960 book is often pretty poor at explaining this. Many times I seek a tutorial online and you get some clear explanations. The circuit of the limiter discriminator in my book has an IF of 455 KHz. Actually I crammed as much as I can on FM and learned new stuff. Very often I will go right back to basic beginner material and may find better understanding of some of it. One very basic concept I revised is phase. The ARRL does have a terrific graph that shows how capacitor current varies from voltage peaks.
At nights I've been looking at reactance FM modulation and limiter discrimination circuits. I must say my ARRL 1960 book is often pretty poor at explaining this. Many times I seek a tutorial online and you get some clear explanations. The circuit of the limiter discriminator in my book has an IF of 455 KHz. Actually I crammed as much as I can on FM and learned new stuff. Very often I will go right back to basic beginner material and may find better understanding of some of it. One very basic concept I revised is phase. The ARRL does have a terrific graph that shows how capacitor current varies from voltage peaks.
