Hi Jim,
Thank you for your reply and the link to your extremely comprehensive
documentation! I read though it at length today and there was much that I did
not understand very well. I am going to read it again over the weekend.
You mention that the bead only works at VHF but I did not recall seeing
anything addressing that. Is it that the choking resistance is not great
enough or is there some other reason(s)? Could you please explain?
Tnx & 73
Bob KQ2M
From: Jim Brown
Sent: Wednesday, November 06, 2019 10:52 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Ferrites 31 vs. 77 material
On 11/6/2019 6:28 PM, Bob Shohet, KQ2M wrote:
> I prefer to use large ferrite beads that fit on the coax – roughly 1/2” ID -
> 1” OD x 1 1/4” height and then tape the beads in place in physical proximity
> to each other next to the feedpoint.
You may prefer that, but that sort of bead only works at VHF. My
detailed recommendations are here. http://k9yc.com/2018Cookbook.pdf
Yes, #31 material is the weapon of choice for 160M - 6M.
73, Jim K9YC
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