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It is basically a single pentode-type tube (pentagrid tubes are also used with two or three diodes arranged to control linearity, turn-on or turn-off time, and operating level.
How does it work, how good is the sweep and how clean is the output.
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This circuit had special significance for the timing in ancient analogue radars.Graphical Display 4D-Systems Color LCD Touc.1 2, whereas a multivibrator derives its timing waveform from an R-C circuit, the phantastron uses a basic Miller-type sweep generator to generate a linear timing waveform, rather than the exponential waveform developed by the R-C circuit of snow and rock discount code 10 the multivibrator.Iframe width"640" height"360" src"m/embed/-A_DxsxPdeI" frameborder"0" href"ml" #45: Sweep Generator Basics and Receiver Alignment /a This video discusses the basics of a sweep generator, and how it can be used to observe the alignment of IF filters in a receiver.I take a look at this little 59 swe.It was invented in 1942 during radar development in World War 2 by the British engineer Alan Dower Blumlein.At face value it may sound hard.The relationship between the screen-coupled and cathode-coupled phantastron is considered to have the best timing accuracy, the cathode-coupled circuit has other advantages.The phantastron-type circuit is considered to be a relaxation oscillator similar to the multivibrator in operation.Figure 1: Screen-coupled type of phantastron.For example it is used as a time-modulated pulse, to indicate antenna position at any instant of rotation, or as a range strobe or delay marker.Because of its extreme linearity and accuracy, this waveform is used as a delayed timing pulse, usually in radar or display equipment.Thus, the output waveform is a linear function of the input (control) voltage, and the timing stability is improved.The fast-recovery type circuit uses a separate cathode follower to help speed up operation and provide a shorter recovery time.Figure 2: Solid state phantastron circuit.The benefits of using a sweep gen, including the ability to observe whether multiple IF transformers in a single IF chain are aligned, or to see the shape of the skirts of a filter, is shown.
The cathode-coupled circuit utilizes uses an internally generated waveform developed across a resistor in the cathode circuit to control operation.