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Author Topic: Ferrite for vhf /uhf common mode choke.  (Read 4079 times)
VK2FXXX
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Posts: 102




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« on: March 02, 2012, 02:18:23 PM »

Hi.
I am looking to make a common mode broadband choke for my diamond d130 discone.
The fair rite site suggests type 31,or 44 material is good to 500mhz.
does anybody have any experience or measurement data for a choke made from the above material?
thanks
Brendan
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N5NA
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Posts: 217




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« Reply #1 on: March 02, 2012, 07:45:22 PM »

K9YC's "A Ham's Guide to RFI, Ferrites, Baluns, and Audio Interfacing" has all kinds of good info.  You can download it at http://audiosystemsgroup.com/RFI-Ham.pdf

73, Alan N5NA
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VK2FXXX
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Posts: 102




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« Reply #2 on: March 03, 2012, 03:20:50 AM »

Thanks Alan.

I have that paper saved in my computer, but had not got to reading it.
I just read most of it ,and it seems some ,#43 material will work if I only use 1 turn through the toroid.Therefore  15 beads of the above material slipped over some rg213 would appear to have 1500+ equivalent series resistance between 100mhz and 1ghz.
Good read, thanks for reminding me of it.
Brendan.
« Last Edit: March 03, 2012, 05:00:44 AM by VK2FXXX » Logged
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