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Author Topic: grid circuit swr...  (Read 25073 times)
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W3RSW
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Rick & "Roosevelt"


« Reply #50 on: February 21, 2014, 08:49:39 PM »

Good going. Looks like you tried for the optimim.  Of course your split voltage ratings also vary from equal voltage each when stacking capacitors.  Optimum voltage split, of course, is when both capacitors are the same value.

You need to split the capacitance equally at what the resonant capacitance combo will be, and if reasonably calculated still gives some vernier action of the variable cap over a desired freq. range.

So it's a compromise between loss of vernier action with too large or to small a series fixed cap and loss of a decent voltage split whereby one cap is still going to see most of the voltage anyway .  Many mysterious arcs have occurred this way.

Mmm, same thing three ways just as muffled said I.  Grin

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RICK  *W3RSW*
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« Reply #51 on: February 21, 2014, 10:43:29 PM »

Sounds like the 500 pf would be better then 1200 then....
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W3RSW
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Rick & "Roosevelt"


« Reply #52 on: February 22, 2014, 06:45:41 PM »

Yes sir, closer.  Voltage split Formula is in most handbooks along with cap. Values from stacking in series.
And nice talking with you on 40 this morning. You were 10 over at times. I like your 4x150 rig. Good tight audio.
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RICK  *W3RSW*
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« Reply #53 on: February 22, 2014, 09:45:21 PM »

Yes, real nice qso today.

The audio is too tight.
I need to look into that next, with the signal generator, the rigs seem to pass higher frequencies ok, but not so much with my voice.


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