[TowerTalk] VHF/UHF Common Mode Choke
jim at audiosystemsgroup.com
Sat Jun 29 00:29:26 EDT 2019
On 6/28/2019 5:49 PM, jimlux wrote:
> Is 31 a good material for UHF? I always think of it as a HF material,
> but it could well be useful up to 500 MHz.
Yes, it's a very good material for 6M and 2M. From that table of chokes,
click on any part number to see the data sheet. Scroll down to see plots
of Zmag for 1, 2, and 3 turns. For practical chokes, these
characteristics will vary with cable diameter, turn diameter, and turn
spacing. My recommendations are based on measurements of tightly spaced
turns with diameters on the order of min bend radius.
The reason #31 is a bit better than #43 is that it's lower Q, so the
resonance is a bit broader.
73, Jim K9YC
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