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#1
September 5th 07, 04:24 PM
posted to rec.radio.amateur.homebrew
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Single Tube Modulator
On Thu, 30 Aug 2007 17:54:46 -0600, Jack Schmidling
wrote: Is it convenience or the laws of physics that modulators are always two tubes in push pull? I have an extra 811 and socket and was wondering if there is a way to use this to plate modulate my 811 cw transmitter. pics of 811 project at http://schmidling.com/radio.htm js Finding a plate modulation transformer may be the hardest part. They have always been expensive. Cathode modulation is my next choice with grid modulation as a last resort. John Ferrell W8CCW "Life is easier if you learn to plow around the stumps" |
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#2
September 6th 07, 08:30 PM
posted to rec.radio.amateur.homebrew
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Single Tube Modulator
On Sep 5, 12:24 pm, John Ferrell wrote:
On Thu, 30 Aug 2007 17:54:46 -0600, Jack Schmidling wrote: Is it convenience or the laws of physics that modulators are always two tubes in push pull? I have an extra 811 and socket and was wondering if there is a way to use this to plate modulate my 811 cw transmitter. pics of 811 project athttp://schmidling.com/radio.htm js Finding a plate modulation transformer may be the hardest part. They have always been expensive. Cathode modulation is my next choice with grid modulation as a last resort. John Ferrell W8CCW "Life is easier if you learn to plow around the stumps" Screen grid modualtion it it was a tetrode PA! But the 811 is a triode I think? |
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#3
September 15th 07, 01:23 AM
posted to rec.radio.amateur.homebrew
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Single Tube Modulator
terry wrote:
On Sep 5, 12:24 pm, John Ferrell wrote: On Thu, 30 Aug 2007 17:54:46 -0600, Jack Schmidling wrote: Is it convenience or the laws of physics that modulators are always two tubes in push pull? I have an extra 811 and socket and was wondering if there is a way to use this to plate modulate my 811 cw transmitter. pics of 811 project athttp://schmidling.com/radio.htm js Finding a plate modulation transformer may be the hardest part. They have always been expensive. Cathode modulation is my next choice with grid modulation as a last resort. John Ferrell W8CCW "Life is easier if you learn to plow around the stumps" Screen grid modualtion it it was a tetrode PA! But the 811 is a triode I think? You can always grid modulate a triode tube. The results are similar to screen modulation of a tetrode tube. |
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