Since the ionosphere was nearly always in a changing state and since radio waves would frequently be simultaneously refracted at several different levels in the ionosphere, fading due to radio wave phase changes on a single antenna was always going to be present.The solution was to use separate antennas and separate receivers to provide the isolation necessary so each antenna and receiver would react to radio waves specific to its time and space relationship.
At first the engineers speculated that radio waves were being refracted in the ionosphere at different angles and therefore some waves would be intercepted by an antenna while other wave-angles would miss the antenna. The two men then theorized that over-the-horizon radio waves could be refracted simultaneously from different heights in the ionosphere, these waves would travel slightly longer or shorter paths and arrive at a single antenna at slightly different times.Dating shouldn’t be complicated, use our location feature to find people in your local area.If you have any questions or would like some support simply contact our customer care team found within the site.They were utilizing a telephone line to monitor Peterson's receiver at his home and were comparing that to the received signals from the RCA station site, located about one-half mile away.By monitoring the same transmitter signal as received from two different locations simultaneously, Beverage and Peterson noted that each station received the signal with different fading characteristics.Besides fading, other phenomena occurs when radio waves are refracted through the ionosphere, such as selective sideband fading causing distortion on AM signals along with rotation of the radio waves causing polarization changes. Peterson, began investigating what was actually happening when signals faded.
In the early 1920s, two engineers working for RCA, Harold H. The event that fomented Beverage and Peterson's interest happened when the two were monitoring signal reception from two points simultaneously.
The associated antenna farm, with 1000 feet of separation between antennas, required acres of land.
The installation was used for commercial sending and receiving world-wide radiograms.
More tests showed that different fading occurred with as little as three hundred feet of separation of the receiving antennas.
Beverage and Peterson first connected strip-chart recorders to a combination of three antennas and three receivers.
When a BFO was injected into the second detectors the strength of the BFO oscillator would capture the AVC and not allow it to follow the signal strength variations in that receiver.