Not that at all like that Tom, you are absolutely correct. If I doubted you I might have
pressed you for your source. I just happen to be one of those people that doesn’t run on
faith alone, I need to see the whole picture rather than just get a glimpse of what’s going
on, and I just happen to have a few meters that can check capacitance. Some folks are just
as happy as a pig in the mud to get into their car, turn the key and drive off not caring
exactly what just happened to get them moving. I want to lift the hood an understand the
sequence.
My wife and I took flying lessons back in the 70’s and after we got our license she was
content to rent planes and fly her friends around the pea patch. I on the other hand had to
know more about the machine so I studied the ins and outs of aircraft construction and
scratch built a biplane and then a high wing two place cabin plane. So you see, I just want
to understand how it works, not doubting your expertise at all.
I'm a rank amateur at radio restoration, I've only done a couple of total restorations over
each winter since I got interested in the radio hobby a couple of decades ago. I've studied
enough radio theory to understand the roll that capacitors play in controlling a radio
circuit but the noise suppression application has me a little cornfused.
Ignition system noise or noise itself covers a whole rash of frequencies and I’m trying to
understand how you would figure the correct capacitance or voltage rating for the
different applications in the engine compartment.
The original radio installation in the AD trucks used several different values for noise
suppression and I’m interested in why or how we can get away with a one-size-fits-all
approach today:
For instance, the regulator used a pn.1912900 condenser, the generator used a
pn.1911095 condenser, the coil used a pn.1910147 condenser, the coil high tension lead
used a pn.1887829 and a pn.7557919 was used at the ammeter.
Seeing the how much penny pinching went on at GM back in the day it seems odd that
the bean counters would give the go ahead to the engineers to specify all those different
values if one value would have served the purpose. And they specified those different
values over the entire run of the AD series.
Denny Graham
Sandwich, IL
Last edited by Denny Graham; 02/05/2012 2:38 PM.
