When radio people talk about 'Phasors', we don't mean the ray guns used by Alien Monsters. To us, Phasors are pieces of equipment used in directional AM Stations.

Kintronic Labs

The Phasor takes the Power from the transmitter and distributes it to the towers, It also shifts the Phase and amplitude of the power to each of the towers to determine which ways the power will be aimed.
This is important in determining what's called the 'pattern' or the strength of KXTA in various directions from the antenna system.
For example, KXTA sends most of the power in a direction towards Los Angeles, and less power towards Orange County. This is so that we can get enough signal over Los Angeles, which is our 'City of License'

Phasor Cabinets

Lines connecting the different towers and transmitters to the top of the Phasor.


The output of the transmitter is applied to one common point in the phasor, and distributed from there.
This meter reads the actual current at the 'common point', and is used to determine the actual power input to the entire antenna system.
So, of all the readings we keep track of, this is the most important.


Because of the difference in 'distance the signal goes', or 'propagation', we use different patterns at night than we do at day.
(We protect different stations at different times)

AM Radio Broadcasts go a lot farther at night because the layer in the atmosphere that they bounce off moves to a lot higher altitude. This layer is called the ionosphere.

The result is that a signal good for two or three bounces will go a lot farther around the globe than if those bounces happen when the ionosphere is at a much lower altitude.

Control for Tower # 4 Daytime Phase


That's why these knobs, which are mounted on the front of the Phasor, are labelled 'Daytime' Adjustments. A different set of knobs is switched in for nighttime operation.

Control for Tower # 2 Daytime Power


This is one of the 'contactor' relays that switches in the different coils and capacitors to effect the pattern changes. Each one of them has extra 'annunciator' contacts so we can be sure the switch really happened. If it didn't, we could be causing serious interference to other stations, or damage to our own equipment.


The phasor, the antenna tuning units, the ioscoil boxes, and all the bandpass filters were designed by Ron Rackley, of Dutreil, Lundin, and Rackley, and beautifully assembled by Kintronic Labs. For additional information about Kintronic, click on the graphic.


For further information on Dutreil, Lundin, and Rackley, Consulting Engineers, click on their logo below....


For more details about Phasor Construction, click here:

For details about planning the transmission lines, click here:



Copyright 2005 by Vital Sounds - ALL RIGHTS RESERVED