"Roy Lewallen" wrote in message
...
As I recall, Armstrong invented and patented the FM radio before WWII.
If I'm correct, his patent should show a schematic of the circuit he
used. It's probably still available from the patent office.


It was actually posited in a presentation in 1935. See Wikipedia entry on
FM.

Brenda Ann wrote:

"Roy Lewallen" wrote in message
...


As I recall, Armstrong invented and patented the FM radio before WWII.
If I'm correct, his patent should show a schematic of the circuit he
used. It's probably still available from the patent office.




It was actually posited in a presentation in 1935. See Wikipedia entry on
FM.





FM back then was on frequencies around 25MHz for experiments. Ordinary
higher frequency HF SW front ends would have sufficed, with a higher
frequency IF strip. Today hams have a
small 10 meter sub-band for FM somewhere around 29MHz. Later a
broadcast band
from about 41 to 50MHz was set up. See
http://members.aol.com/jeff560/jeff.html for more FM history.

Brenda Ann wrote:

"Roy Lewallen" wrote in message
...


As I recall, Armstrong invented and patented the FM radio before WWII.
If I'm correct, his patent should show a schematic of the circuit he
used. It's probably still available from the patent office.




It was actually posited in a presentation in 1935. See Wikipedia entry on
FM.





FM back then was on frequencies around 25MHz for experiments. Ordinary
higher frequency HF SW front ends would have sufficed, with a higher
frequency IF strip. Today hams have a
small 10 meter sub-band for FM somewhere around 29MHz. Later a
broadcast band
from about 41 to 50MHz was set up. See
http://members.aol.com/jeff560/jeff.html for more FM history.