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Let's include the circuit from the original paper. Reason is, when I put the diagrammed circuit (created by user:Rainglasz), into an LTspice simulator to look for oscillation, I found it was too damp to sustain oscillation with the parameters given. The problem was, the JFET operates at lower voltages than do tubes, so the value for C0 needed adjustment. But, it does oscillate in the simulator if C0 > 6680pF and given a pulse to start it. So I'm guessing that the relation Cv Cg /(Cv + Cg) = Ca - C0 will give about optimal behaviour. -- Waveguy ( talk) 03:52, 14 March 2010 (UTC)
The problem with LT spice is, it doesn't work properly. Dave — Preceding unsigned comment added by 88.146.180.186 ( talk) 23:24, 8 February 2012 (UTC)
1. How is Vackář pronounced?
2. The paragraphs under "Invention" should be in the past tense (not half in the present tense and half in the past tense).
3. "Vackář reports that VFO circuit being used by the Czechoslovak Post Office since 1946."
This sentence needs revision.
4. After reading the "Invention" section, it's not clear if Vackář or Radioslava invented the oscillator. It seems Vackář credited a company called Radioslava for developing the circuit in 1945. If that is the case, why is that this circuit is not called Radioslava oscillator?
5. Is there an expression for predicting the frequency based on L and C values?
ICE77 ( talk) 02:55, 4 August 2015 (UTC)
![]() | This article is rated Start-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | ||||||||||
|
Let's include the circuit from the original paper. Reason is, when I put the diagrammed circuit (created by user:Rainglasz), into an LTspice simulator to look for oscillation, I found it was too damp to sustain oscillation with the parameters given. The problem was, the JFET operates at lower voltages than do tubes, so the value for C0 needed adjustment. But, it does oscillate in the simulator if C0 > 6680pF and given a pulse to start it. So I'm guessing that the relation Cv Cg /(Cv + Cg) = Ca - C0 will give about optimal behaviour. -- Waveguy ( talk) 03:52, 14 March 2010 (UTC)
The problem with LT spice is, it doesn't work properly. Dave — Preceding unsigned comment added by 88.146.180.186 ( talk) 23:24, 8 February 2012 (UTC)
1. How is Vackář pronounced?
2. The paragraphs under "Invention" should be in the past tense (not half in the present tense and half in the past tense).
3. "Vackář reports that VFO circuit being used by the Czechoslovak Post Office since 1946."
This sentence needs revision.
4. After reading the "Invention" section, it's not clear if Vackář or Radioslava invented the oscillator. It seems Vackář credited a company called Radioslava for developing the circuit in 1945. If that is the case, why is that this circuit is not called Radioslava oscillator?
5. Is there an expression for predicting the frequency based on L and C values?
ICE77 ( talk) 02:55, 4 August 2015 (UTC)