This is not a laboratory test but it does indicate that an individual Ford Coil supplied with 6 VDC at 1.5 amps (9 watts)will produce electromagnetic signatures. The frequency varies from 400 HZ to 1000 HZ. The attached photograph was when the coil was at 717 HZ.
But what would happen if it was supplied with 60 Hz AC?
George, do you have a part # for the coil you used? Jerry....
Can you play with some "coil man" tested hand crank adjusted coils and see if they have a common signature ?
Oh hell George, kids been doing that since the early 1920's.
It's called a spark gap transmitter.
Place any AM radio near a running Model T and hear the music.
Ron the Coilman
To Answer the questions:
1. Michael - I used an older low voltage "sub-station." It was a Cambosco (Scientific Company, Boston, Mass.) Universal Low Voltage Power supply. Maximum AC voltage a 60 cycles 12 volts. No idea about the amperage. The frequency reading was 414 HZ. From the literature of the period, 400 rpm or 10mph produces 9.8 volts ac, at 52.8 cycles AC.
2. Jerry - your question about the "part # for the coil?" The coil in my test box, to left in the picture, is a Ford coil. Located on the top near the point is a script stating "Ford."
3.Ted I have a hand crank coil tester, maybe some time I will set a frequency meter along side and see that the frequency range maybe. Until then the real world test would be having the frequency meter inside the car whilst the engine is operating.
4. Ronald such language from the coil sage! Are talking about a spark gap transmitter similar to this? Yes sir there are harmonics and frequency drifting from the bugger. th
Everything old is new again ...
Apply power, key and wait till the FCC visit in their truck with funny antennas.
Ron the Coilman
From what I understand the FCC has purty much turned over stuff like that to the local sheriffs in the country to take care of.
It is so bad with CB amps around here I may as well have my own tv station or something
I keep looking at that key and it makes me mad. I had my written passed and had learned half my code and gave up ham radio because of the attitude of the "middle age pharts" that were in the hobby pushing me to use 2 meter handhelds. I wanted vacuum tubes .