Simple Battery Operated Spark Transmitter
The early wireless transmitter shown above was, in its time, was cutting edge technology but today is regarded as piece of curious apparatus. The banner images show a simple battery operated spark transmitter. Coast stations would be slightly different--the battery would be removed and a generator put in its place. If the generator was alternating current, the interrupter would be removed as well.Read More
The early stations required a source of electricity only for transmitting. This was supplied by a Fairbanks-Morse single cylinder gasoline engine driving a generator. The unit would be manually started by giving the flywheel a spin. When the transmitter wasn't in use, the engine was shut down. Receivers required no power, and lighting was done by oil lamps.Read More
So just how did the old time operators go from receiving to transmitting, using only one aerial. They both can't be connected at the same time.Read More
Typical Coast Station
Here is a photo of a typical coast station at the turn of the century. The major items are all identified.Read More
1 kWatt Marconi Ship Station
Retired ship operator's reminiscences on his old Marconi 1 kW ship station. Schematic and explanation.Read More
Improved Spark Transmitter
A better spark transmitter is described in this section. It uses a quenched spark system to effectively double the efficiency of the transmitter.Read More
1918 U.S. DeForest Military Receiver
Excellent photos of a deForest crystal receiver built for the U.S. military.Read More
Magnetic Detector Images
Photos found on eBay, of all places.
September 1937 edition of "Radio World".
Almost the full edition. Read what was holding the radio experimenter's interest in 1937.
Wireless and landline codes lifted from a turn of the century book. Click to enlarge.