The output of the selected antenna on all four towers was sent to a single radiogoniometer system ( not Watt's own huff-duff solution ).
12.
The ability to inexpensively process radio signals using microcontrollers allowed pseudo-doppler direction finders to take over most of the radiogoniometer's remaining roles from the 1980s.
13.
This modification added a set of vertical antennas and a new elevation-measuring CRT to read them, along with a radiogoniometer that allowed the vertical angle to be accurately measured.
14.
The switching system was modified such that the range was sent to the upper line for 2.5 milliseconds ( ms ), and the range and radiogoniometer signals for 7.5 ms.
15.
Earlier RDF systems used very large rotating loop antennae, which the B T system replaced with two fixed antennae and a small rotating loop, known as a "'radiogoniometer " '.
16.
When connected to the radiogoniometer, the output on the display was now effected by the relative signal strength of the two lobes, rather than the relative strengths in X and Y in the horizontal plane.
17.
To convert this to the real range on the ground, the plotter used basic trigonometry on a right angle triangle; the slant range was the hypotenuse and the open angle was the measurement from the radiogoniometer.
18.
The signal from the selected antennas on the receiver towers were fed through the radiogoniometer and then into a three-stage amplifier, with each stage housed in a metal screen box to avoid interference between the stages.
19.
During the Spanish Civil War, the Leon aerodrome was the headquarters of numerous airborne units and at the end of the conflict it was listed as class A . At that time it had radio and telephone facilities, a radiogoniometer and night lighting.
20.
Watt and Herd wrote an extensive paper on the system in 1926, referring to it as " An instantaneous direct-reading radiogoniometer " and stating that it could be used to determine the direction of signals lasting as little as 0.001 second.
