06-03-2022, 04:32 PM
(This post was last modified: 06-03-2022, 04:44 PM by Mike Watterson.)
It's also reviewed in Experimental Wireless May 1926 and Popular Wireless April 1926
https://worldradiohistory.com/hd2/IDX-UK...IDX-30.pdf
https://worldradiohistory.com/hd2/IDX-UK...IDX-36.pdf
Those two links have more info.
I don't see anything in radiomuseum.org so can't have been common.
Printed circuit spiral coils have been used for small fixed values. This doesn't look like a good idea for LW/MW/SW. The unconnected part is a problem. A variable coil made in 1980s solved that by having a braided wire coil on a former wound on or off a metal spindle so the only coil was the active part.
P.S. The new image attachment scheme baffles me.
Nothing shows up so I deleted it.
https://worldradiohistory.com/hd2/IDX-UK...IDX-30.pdf
https://worldradiohistory.com/hd2/IDX-UK...IDX-36.pdf
Those two links have more info.
I don't see anything in radiomuseum.org so can't have been common.
Printed circuit spiral coils have been used for small fixed values. This doesn't look like a good idea for LW/MW/SW. The unconnected part is a problem. A variable coil made in 1980s solved that by having a braided wire coil on a former wound on or off a metal spindle so the only coil was the active part.
P.S. The new image attachment scheme baffles me.
Nothing shows up so I deleted it.
