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Coil Turns Spacing & Wire Gage vs Power / Voltage




 
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Author Topic: Coil Turns Spacing & Wire Gage vs Power / Voltage  (Read 330 times)
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W9ZSL
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« on: December 30, 2017, 02:40:06 PM »

I know there are charts listing plate spacing vs voltage for variable capacitors. Is there any chart or formula for coils in a Pi Network? I ran across this in my jonque box. It has a nice shorting switch. It appears to be 15-80 meters, is 2" by 3" with perhaps 16 or 14 gage wire. Turns are spaced 1/8" and it needs the separate 10 meter coil. This may have come from a Heathkit. How do I determine its power-handling capacity?


* Coil.JPG (790.25 KB, 2048x1536 - viewed 76 times.)
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DMOD
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« Reply #1 on: December 30, 2017, 05:39:30 PM »

If the coil is 16 or 14 gauge it should be able to work to 100 Watts.

There are spreadsheets for Pi-networks but they don't determine power handling capabilities, they only give values for the Shunt-C, Series-L, and Shunt-C components.

How do you know it needs a separate 10 m coil? Have you measured the inductance and have a schematic of the Final stage?

Are you homebrewing?

Phil - AC0OB

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"What kind of Koolaid do they make you drink in the Physics Department?" Charlie Epps to Dr. Larry Fleinhardt, NUMB3RS   Smiley
W9ZSL
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« Reply #2 on: December 31, 2017, 01:50:49 PM »

I was thinking of using it for an AM rig with parallel 5933s running about 120 watts. The switch is 5 positions. Each position shorts out one portion of the coil. In the fifth position, the entire coil is shorted so it will require a 10 meter coil.
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W9ZSL
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« Reply #3 on: December 31, 2017, 02:32:43 PM »

This appears to have come out of a Heathkit Apache so it can handle 180 watts CW and 150 AM.
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DMOD
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« Reply #4 on: December 31, 2017, 03:10:04 PM »

No doubt about it.   Cool

Here is a pic of the RF cage from the Apache now on my bench for a Cap upgrade.

Phil


* Apache RF Cage.jpg (908.46 KB, 2678x1783 - viewed 79 times.)
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W9ZSL
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« Reply #5 on: January 01, 2018, 03:09:20 PM »

That be it alright with a nice shot of the 10 meter coil.
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W9ZSL
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« Reply #6 on: January 02, 2018, 12:19:40 PM »

Thanks!
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