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Author Topic: RF Choke Design  (Read 6260 times)
W8JI
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« on: October 12, 2010, 02:11:07 PM »

I put up a page on RF choke design.

http://www.w8ji.com/rf_plate_choke.htm
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VE1IDX
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« Reply #1 on: October 12, 2010, 05:30:54 PM »

Excellant info. Thank you very much sir. i am in the planning stages of building an HF amplifier and plate choke resonances was on my mind. Now I am better armed when it comes to winding my own and checking them. 
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W0BTU
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« Reply #2 on: October 12, 2010, 10:01:08 PM »

Fascinating. Thanks, Tom.

Just one question: when a metal screw and nut turns the band at the end of the choke shown in http://www.w8ji.com/images/Amplifier/Plate%20Choke/Three-section-AL80B.jpg into a shorted turn, what effect does that have?
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W7SMJ
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« Reply #3 on: October 12, 2010, 10:13:28 PM »

Excellent info.  Thanks!
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W8JI
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« Reply #4 on: October 13, 2010, 02:45:43 AM »

Thanks for all the comments!

Fascinating. Thanks, Tom.

Just one question: when a metal screw and nut turns the band at the end of the choke shown in http://www.w8ji.com/images/Amplifier/Plate%20Choke/Three-section-AL80B.jpg into a shorted turn, what effect does that have?

Very small Mike. The largest effect by far is any capacitance added in the "hot" areas.
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W0BTU
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« Reply #5 on: October 15, 2010, 11:37:11 PM »

Thanks, Tom. When I added 160 to my SB-200, I ground a gap in the band on the stock Heathkit plate choke -- thinking that it could be a problem-- at the same time that I added another choke in series with it. Then I super-glued it to the ceramic rod.

I'm sure you've seen this method of winding:
http://www.w0btu.com/files/misc/Gates%20plate%20choke.jpg
That Gates plate RF choke will likely go in my amplifier, if I ever get motivated. :-)
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K9FV
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« Reply #6 on: October 16, 2010, 06:09:39 AM »

As usual you have another GREAT article Tom - thank you!  This one is written to where I understand, and a simple way to test - that I do like!

Thank you for ALL the good articles and comment you post.

Ken H>
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